May 29, 2001

Confidential and Proprietary Information of BTI Page 1

BT1074Bi

850-950MHz RF TRANSCEIVER

RFI

s for 850 - 2400MHz

TRFIC

SINGLE CHIP 850-950MHz RF TRANSCEIVER

Features

Complete single chip RF transceiver

Two on-chip local oscillators

I/Q or FM* input interface

Single power supply 2.7 - 3.6 V

Low power consumption BiCMOS technology

On-chip LNA and RF Mixer

RF Power selectivity (-4dBm or +17dBm)

Wide operating temp range (-40

C to +85

Applications

902-928 MHz ISM Band

868-870MHz Band (Europe)

Direct Sequence Spread Spectrum (DSS)

Frequency Hopping Spread Spectrum

Wireless LAN

Wireless Communication Products

Description

The BT1074Bi is a BiCMOS monolithic integrated RF transceiver. In addition to the input I/Q interface, the
IC contains all of the required components to implement a complete RF-IF transceiver. This includes two
on-chip local oscillators, a low noise amplifier with an overall noise figure of less than 5dB over tempera-
ture and power supply variations, two highly linear down-conversion mixers, an IF amplifier, an upconver-
sion mixer and an on-chip power amplifier capable of delivering -4dBm to +17dBm. The unit operates with
a power supply voltage range of 2.7 - 3.6 volts.

* See Single-ended RFM input application example on page 15.

_
PR

TX_

GND_

CNT

D_U

GND_

IF2

L
EXTP

VDDRFVCOIN

GNDLNA

RF_INP

GNDLNA1P

RF_OUTP

GND_PA1

RF_OUTN

GND_PA2

VDDPA_GR

GND_PA3

REXT2

RF_VCO_OUT

RF_INN

RFVCOCAPIN

GNDRFVCOIN

RF_VCO_CTRL

VDDRF_VCO

GNDRF_VCO

VDDIF_VCO
GNDIF_VCO

GNDIFBUF

IF_VCO_OUT

RF_VCO_EN

DDL

OUTP

GND_

DMX

DD_

GND_

DMX

_
I
F

OUTN

_IN

GNDRX

DDL

BT1074Bi

TXI

GND_

I
F

D_DM

BTI

GNDLNA1N

MIXE

RINP

REXT1

GND_PRE1

GND_PRE2

LEXTN

D_T

I
F

DD_

IFV

I
N

TXQ

XOU

DDRX

IFCAPIN
IF_VCO_CTRL

IF_VCO_GND

GND_IFVCOIN

Ordering Information

BT1074Bi

850-950MHz RF Transceiver

BTI, 13825 Cerritos Corporate Dr., Cerritos CA. 90703, U.S.A.
Tel (562) 407-0500 Fax (562) 407-0510 sales@betheltronix.com www.betheltronix.com

May 29, 2001

Confidential and Proprietary Information of BTI Page 2

850-950MHz RF TRANSCEIVER

BT1074Bi

RFICs for 850 - 2400MHz

TRFIC

Specifications

Parameters

Min.

Typ.

Max.

Units

Overall

Power supply
Operating Frequency ranges

Receiver

Gain
Noise Figure
Input IP3
Current consumption (w/ RF VCO)

Transmitter

Gain
TX current consumption @
High power mode (with RF & IF VCOs)
*with RF PA @ +15 dBm output
IFVCO current consumption
RFVCO current consumption

2.7

890
860

3.6
-11

-
-

3.0

915

-12

89*

27
32

3.6

940
875

-13

-
-

MHz
MHz

dB
dB

dBm

mA
mA

Receiver Section
LNA + RF Downconversion Mixer

Gain
Input IP3
Input 1dB compression point
Noise figure (LNA only)
S11
Input impedance

Output Impedance
Image Rejection (at typical center freq.):
915MHz
881.49MHz

-13
-22
2.4
-44

-
-

27
26

-12
-21
2.8

300

29
28

-11

-20

3.3

-22

-
-

31
30

dBm
dBm

dB
dB

IF Downconversion Mixer & IF Amp

Gain
Input IP3
Input 1dB compression point
Noise figure
Input Impedance
Output Impedance

-10
-20

-
-
-

-10
-20

300
330

-9

-19

-
-
-

dBm
dBm

Transmitter Section
I&Q Modulator & Filter

Input impedance
I/Q input frequency
I/Q input swing
I/Q input DC level
M_REF DC level

-
-
-
-
-

>20

0.5

VDD/2
VDD/2

-
-
-
-
-

MHz

Vp-p

V
V

May 29, 2001

Confidential and Proprietary Information of BTI Page 3

RFI

s for 850 - 2400MHz

TRFIC

850-950MHz RF TRANSCEIVER

BT1074Bi

* The values in these sections refer to the 902-928MHz application. To use the BT1074B in the 868-
870MHz band, only the RF VCO, IF VCO, power combiner and LNA RF matching component values need
to be changed.

Absolute Maximum Ratings

Pin Table

RF Upconversion Mixer

Conversion gain (internal)
Input IP3
Input 1dB compression point

-
-
-

-10
-20

-
-
-

dBm
dBm

Power Amplifier*

Output power into 50

load, high power

mode (TX_P_CNT=0V)

Output power into 50

load, low power

mode (TX_P_CNT=VDD)

Voltage Gain (internal)
Output impedance (after combiner)

Output 1dB compression point
Output spurious suppression

+13

-
-
-
-

+15

-4

25
50

-40

+17

-
-
-

-30

dBm

dBm
dBm

RF VCO Section*

Frequency range (at output to PLL)
VCO phase noise at 100KHz offset

(closed-loop)

VCO phase noise at 1MHz offset
VCO output level (50

)

780

-14

805

-100

-118

-12

830

-6

MHz

dBc/Hz

dBm

IF VCO Section*

Frequency range (at output to PLL)
VCO phase noise at 100KHz offset

(closed-loop)

VCO phase noise at 1MHz offset
VCO output level

205

-14

220

-112

-120

-8

235

-2

MHz

dBc/Hz

dBm

Parameters

Value

Unit

Supply Voltage

Power Control Voltage

+0.5

Storage Temperature

+150

Pin

Parameter

I/O

Description

Power and Ground Pins

63/64

VDDLNA1-2

Power supply to LNA

VDD_DMX

Power supply to downconverters

VDD_IF

Power supply to RX differential-to-single buffers

VDD_IFVCOIN

Power supply to IF VCO first stage

Parameters

Min.

Typ.

Max.

Units

May 29, 2001

Confidential and Proprietary Information of BTI Page 4

850-950MHz RF TRANSCEIVER

BT1074Bi

RFICs for 850 - 2400MHz

TRFIC

VDD_UPC

Power supply to TX upconverters

VDDPA_GR

Power supply to guard ring

19/20

VDD_PRE1-2

Power supply to pre-amplifier

VDD_TXIF

Power supply to transmitter

VDDIF_VCO

Power supply to IF VCO

VDDRF_VCO

Power supply to RF VCO

VDDRFVCOIN

Power supply to RF VCO input stage

VDDRX_BUF

Power supply to receiver IF buffer

GNDLNA

Ground to LNA

61/62

GND_DMX1-2

Ground to downconverters

GND_IF

Ground to RX differential-to-single buffers

GND_IFVCOIN

Ground to IF VCO first stage

22/23

GND_UPC1-2

Ground to TX upconverters

13/15/18

GND_PRE1-3

Ground to pre-amplifier

7/9/11

GND_PA1-3

Ground to power amplifier

26/27

GND_TXIF1-2

Ground to transmitter

GNDLNA1P

Ground to RX LNA differential first stage

GNDLNA1N

Ground to RX LNA differential first stage

GNDIFBUF

Ground to IF VCO buffer

GNDIF_VCO

Ground to IF VCO

GNDRF_VCO

Ground to RF VCO

GNDRFVCOIN

Ground to RF VCO input stage

GNDRX_BUF

Ground to receiver IF buffer

IF_VCO_GND

Ground to IF VCO buffer

Local Oscillator Pins

IF_VCO_OUT

IF VCO output

IFCAPIN

IF VCO feedback capacitors input

IF_VCO_CTRL

IF VCO control input

RF_VCO_OUT

RF VCO output

RF_VCO_CTRL

RF VCO control input

RFVCOCAPIN

RF VCO resistor bias input

Transmitter Pins

RF_OUTN

Power amplifier output

RF_OUTP

Power amplifier output

TX_P_CNT

Transmission output power control: Hi - low power mode
Low - high power mode

REXT2

Bias for power amplifier

REXT1

Bias for power amplifier

Pin

Parameter

I/O

Description

May 29, 2001

Confidential and Proprietary Information of BTI Page 5

RFI

s for 850 - 2400MHz

TRFIC

850-950MHz RF TRANSCEIVER

BT1074Bi

Detailed Pin Description:

RECEIVER

RF_INP and RF_INN (Pin 4 and Pin 2)
RF Differential Inputs
RF_INP and RF_INN are the differential inputs of the LNA. An AC coupling capacitor of 100pF is required.
RF differential inputs are generated by an external phase-splitter circuit, but for a single RF input, the LNA
can be biased, as shown in the Application Circuit. For optimum performance, the component lead
length of the external phase-splitter circuit and PCB traces to the LNA input pins should be minimized.
Also, the ground plane must surround the phase -splitter circuit to prevent noise coupling from other cir-
cuits. The frequency range is from 890MHz to 940MHz.

RMX_OUTP and RMX_OUTN (Pin 58 and Pin 57)
First IF Differential Outputs
These are the differential outputs of the internal IF buffers. With the external IF combiner circuit as shown
in the Application Circuit, the differential outputs become a single-ended output to drive a 110.592MHz
Bandpass SAW filter. These internal IF buffers have open-drain outputs to drive an input impedance of a
300

BPF through the external combiner circuit.

MIXERINP (Pin 54)
Second IF Amplifier Input
The output of a 110.592MHz BPF SAW filter is connected to this pin for the second stage downconversion.
No AC coupling is required.

LEXTN

Output to external inductors

LEXTP

Output to external inductors

TXI

Baseband quadrature input to the transmitter

M_REF

I/Q input DC reference

TXQ

Baseband in-phase input to the transmitter

Receiver Pins

RF_INP

RF Differential Input to the receiver

RF_INN

RF Differential Input to the receiver

VCO2_IN

Second Mixer's input

MIXERINP

RF input to the second mixer

MIXOUTN

Differential output of second downconverter mixer

MIXOUTP

Differential output of second downconverter mixer

RMX_OUTP

Differential output of downconverter mixer

RMX_OUTN

Differential output of downconverter mixer

Power Down Pins

TX_EN

Transmitter power down control

RX_EN

Receiver power down control

RF_VCO_EN

RF VCO power down control

Pin

Parameter

I/O

Description

May 29, 2001

Confidential and Proprietary Information of BTI Page 6

850-950MHz RF TRANSCEIVER

BT1074Bi

RFICs for 850 - 2400MHz

TRFIC

MIXOUTP and MIXOUTN (Pin 52 and Pin 51)
Second IF Differential Outputs
These are the second IF Amp differential outputs. The gain of the IF Amp can be controlled by connecting
MIXOUTP through a resistor to ground. A 470

resistor to ground gives a 0dB gain. The other Amp output,

MIXOUTN, is fed to a 10.7MHz BPF through an AC coupling (0.1uF) capacitor.

VCO2_IN (Pin 55)
External Clock Input
A clock of 99.892MHz is fed to this pin to downconvert the first IF at 110.592MHz to 10.7MHz. No AC cou-
pling is required.

VDDLNA1, VDDLNA2 (Pin 63 and Pin 64)
LNA power
VDDLNA supplies power to the first and second stage of the LNA. Since the LNA input signal level is small
and high frequency, the VDDLNA should be decoupled very close to the chip (for example, within 0.25
inches of the package).

GNDLNA1P, GNDLNA1N and GNDLNA (Pin 5, Pin 1 and Pin 3)
LNA Ground
GNDLNA1P and GNDLNA1N pins are the ground for the first stage of the LNA and GNDLNA is the ground
for the second stage of the LNA. GNDLNA1P and GNDLNA1N are internally separated. For stability and
optimum performance, the GNDLNA1P and GNDLNA1N should be physically short.

VDD_DMX (Pin 60)
Downconverter Power
VDD_DMX supplies power to the downconversion mixers.

GND_DMX1, GND_DMX2 (Pin 61 and Pin 62)
Downconverter Ground
GND_DMX is the ground for the downconversion mixers. This ground connection is recommended to be
shorted via holes to the ground plane below.

VDD_IF and VDDRX_BUF (Pin 59 and Pin 50)
IF Buffers and Second Downconversion Mixers Power
Both power supplies require 0.1uF bypass capacitors to ground.

GND_IF and GNDRX_BUF (Pin 56 and Pin 53)
IF Buffers and Second Down-Conversion Mixers Ground
GND_IF is the ground for the internal IF buffers, and GNDRX_BUF is the ground for the second downcon-
version mixers and IF amplifiers.

TRANSMITTER

RF_OUTN and RF_OUTP (Pin 8 and Pin 10)
Power Amplifier Outputs
These are the differential outputs of the power amplifier which requires a combining network as shown in
the Application Circuit. The combiner converts the differential signals to a single-ended signal and pro-
vides a matching impedance to 50

as well. DC bias to VDD is required since these are open-collector

outputs, and AC coupling is needed after the combiner as shown.

May 29, 2001

Confidential and Proprietary Information of BTI Page 7

RFI

s for 850 - 2400MHz

TRFIC

850-950MHz RF TRANSCEIVER

BT1074Bi

LEXTN and LEXTP (Pin 16 and Pin 17)
Preamplifier Amplifier Outputs
These are the differential outputs of the preamplifier, which are open-collector types. Two inductors to the
VDD are required for tuning the preamplifier to the desired frequency band. Recommended values for
900MHz are shown in the Application Circuit. Since these are also inputs to the power amplifier, the
inductors should be close to the pins and isolated from the power amplifier output to avoid output feedback
to these two pins, which may cause instability for the power amplifier.

REXT1 and REXT2 (Pin 14 and Pin 12)
Preamplifier/Power Amplifier Bias/Gain Adjust
Rext1 is the biasing resistor for the preamplifier, and REXT2 is the biasing resistor for the power amplifier.
For an output power of +15dBm, recommended values are 1k

for REXT1 and 2.8k

for REXT2. Increas-

ing REXT1 and lowering REXT2 will lower output power, and vice versa.

TXI, M_REF and TXQ (Pin 28, Pin 29 and Pin 30)
Baseband Data Inputs
These are the inputs which interface with the data signals from the digital signal processor (DSP) or micro-
processor (

P). TXI and TXQ are inphase (I) and quadrature (Q) signals, respectively. M_REF is the DC

signal coming from the DSP/

P. All of these pins require a DC level of VDD/2, and a voltage swing of

500mVp-p is required for TXI and TXQ. The Application Circuit shows a technique to interface with 1Vp-
p I and Q signals with a 6dB voltage attenuator with DC reference to M_REF pin. A low pass filter may
also be required to reject sampling noise from the DSP/

P. For DSS applications, the base band data

input signal can be modulated at the IFVCO tank circuit using a Gaussian filter, prior to the PLL frequency
synthesizer. For that, the M_REF pin has to be biased to half of +VDD supply and both the TXQ & TXI
input have to connect to the M_REF pin through a resistor in order to adjust the TX output gain.

VDDPA_GR (Pin 6)
Power Supply for Guard Ring of Power Amplifier
This power supply pin is only for the output stage of power amplifier. It should be decoupled right at the pin
before sharing with other power supplies.

VDD_PRE1, VDD_PRE2 (Pin 19 and Pin 20)
Power Supply for Preamplifier
These are the power supply pins dedicated to the preamplifier. Decoupling should be done right at these
pins to a ground plane, if possible.

VDD_UPC (Pin 21)
Power Supply for RF Upconversion Mixers
This is a dedicated power supply pin for the RF upconversion mixers. Decoupling should be done right at
this pin to a ground plane, if possible.

VDD_TXIF (Pin 31)
Power Supply for Input Buffers and IF Upconversion Mixers
The input buffers and IF upconversion mixers share this power supply on-chip. Besides the usual high fre-
quency decoupling, it should be decoupled for low frequency, up to 10MHz.

May 29, 2001

Confidential and Proprietary Information of BTI Page 8

850-950MHz RF TRANSCEIVER

BT1074Bi

RFICs for 850 - 2400MHz

TRFIC

These are the dedicated ground pins that can share the same ground as long as a good ground plane is
available:
GND_PA1, GND_PA2, GND_PA3 (Pin 7, Pin 9 and Pin 11)
Ground Pins for the Power Amplifier

GND_PRE1, GND_PRE2, GND_PRE3 (Pin 13, Pin 15 and Pin 18)
Ground Pins for the Preamplifier

GND_UPC1, GND_UPC2 (Pin 22 and Pin 23)
Ground Pins for the RF Upconversion Mixers

GND_TXIF1, GND_TXIF2 (Pin 26 and Pin 27)
Ground Pin for the Input Buffers and IF Upconversion Mixers

RFVCO

RF_VCO_CTRL (Pin 45)
RFVCO Input Control
An external tank circuit is connected to the RFVCO Input Control pin (see Application Circuit). The tank
circuit generates the overall oscillation frequency for the RFVCO and therefore must be optimized to avoid
any interference from other components. The RF_VCO_CTRL pin and the external PLL completes the
RF-PLL loop that generates a fixed oscillation frequency for the RFVCO.

RF_VCO_OUT (Pin 43)
RF_VCO Output
The RF_VCO_OUT pin is connected to the external PLL to complete the RF-PLL loop. The PLL applies a
DC voltage to the input tank circuit based on the detected RF_VCO_OUT signal. This DC voltage pro-
duces the negative bias voltage required by the Varactor to generate the necessary capacitance for the
tank circuit network.

VDDRFVCOIN and GNDRFVCOIN (Pin 47 and Pins 44)
RFVCO Input Stage Power Supply and Ground
VDDRFVCOIN is the power supply for the input stage of the RFVCO. For optimum performance,
VDDRFVCOIN should be bypassed to GNDRFVCOIN using a low-inductance / high frequency coupling
capacitor. The input stage of the RFVCO is very critical in generating the overall frequency of the RFVCO;
therefore isolating these power supply pins will enhance the overall performance of the RFVCO.

VDDRF_VCO and GNDRF_VCO (Pin 41 and Pin 42)
RFVCO Power Supply and Ground
VDDRF_VCO and GNDRF_VCO provide the power supply source for the other stages of the RFVCO.

RFVCOCAPIN (Pin 46)
RFVCO Resistor Bias Input
This pin provides an off-chip resistor bias to the RF VCO.

May 29, 2001

Confidential and Proprietary Information of BTI Page 9

RFI

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TRFIC

850-950MHz RF TRANSCEIVER

BT1074Bi

IF VCO

IF_VCO_CTRL (Pin 35)
IF VCO Input
This pin is connected to the external tank circuit as the VCO input. Its frequency is tuned to 221.184MHz
(according to the RF module application) and can vary up to 500MHz.

IFCAPIN (Pin 36)
VCO Feedback Capacitors Input
This pin provides an off-chip capacitive feedback loop to the VCO oscillator.

IF_VCO_OUT (Pin 38)
IF VCO Differential Outputs
The VCO's oscillation frequency can be controlled by connecting its output to a PLL as shown in the Appli-
cation Circuit.

VDD_IFVCOIN (Pin 32)
VCO Input Power Supply
The IF VCO has two power supplies, VDD_IFVCOIN (Pin 32) and VDDIF_VCO (Pin 40). VDD_IFVCOIN
is the first stage VCO power. A large capacitor of at least 100pF is recommended to connect this pin and
ground for filtering out noise.

VDDIF_VCO (Pin 40)
VCO Buffer Power Supply
This pin provides power to the internal VCO buffer circuitry.

GND_IFVCOIN (Pin 34)
VCO Input Ground
This pin is the first stage VCO ground.

GNDIFBUF (Pin 37)
VCO Buffer Ground
This pin is ground for the internal VCO buffer circuitry.

IF_VCO_GND (Pin 33)
Ground to IF VCO Buffer
This pin is ground for the IF VCO buffer, which is used by the transmitter section during transmission.

GNDIF_VCO (Pin 39)
VCO Ground
This pin is ground for the internal VCO circuitry.

POWER SAVING/POWER DOWN PINS

The following pins are all CMOS digital interface.

TX_P_CNT (Pin 24)
Transmission Output Power Control
This pin controls the power amplifier output with two levels. A HIGH signal puts the power amplifier in low
power mode with -4dBm output power. A LOW signal puts the power amplifier in high power mode with
+17dBm output power. These power levels are based upon the resistor values shown for REXT1 &
REXT2.

May 29, 2001

Confidential and Proprietary Information of BTI Page 10

850-950MHz RF TRANSCEIVER

BT1074Bi

RFICs for 850 - 2400MHz

TRFIC

TX_EN (Pin 25)
Transmitter Power Down Control
This pin controls the power down function of the entire transmitter, including the power amplifier and
preamplifier. A HIGH signal turns the circuit on while a LOW signal turns the circuit off.

RF_VCO_EN (Pin 48)
RF VCO Power Down Control
This pin controls the power-down function of the RF VCO, which is used by the transmitter and the
receiver. A HIGH signal turns the circuit off while a LOW signal turns the circuit on.

RX_EN (Pin 49)
Receiver Power Down Control
This pin controls the power down function of the entire receiver. A HIGH signal turns the circuit off while a
LOW signal turns the circuit on.

TYPICAL PERFORMANCE CHARACTERISTICS

The recommended TDD mode as well as power saving mode usage of all of these control pins are as
follows:

Note: Control level for minimum power consumption.

Pins

Communication Mode

Power

Save

Mode*

TX_EN

RX_EN

RF_VCO_EN

TX_P_CNT

May 29, 2001

Confidential and Proprietary Information of BTI Page 11

RFI

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TRFIC

850-950MHz RF TRANSCEIVER

BT1074Bi

Block Diagram

IF1=110.592MHz

3dB BW=1.1MHz

RF VCO

LNA

BT1074Bi

Power Amp (Pout=15dBm) IF Filter

RF Filter RF Mixer Buffer

Tx/Rx:

902-928MHz*

P
F
&

ANT

.

S
W

(99.892MHz)

IF Mixer I FAmp (adjustable)

*: ISM Band

LC or RC Filter
Fc=10.7MHz
Zin=Zout=330

I/Q INPUT

Image-Reject
Mixer

IF VCO

(110.592MHz)

IFVCO_CTRL
(442.368MHz)

IFVCO_OUT
(221.184MHz)

(

791.408 ~ 817.408MHz)

RFVCO_OUT

RFVCO_CTRL

RF_OUTN
RF OUTP

RF_INN
RF INP

May 29, 2001

Confidential and Proprietary Information of BTI Page 12

850-950MHz RF TRANSCEIVER

BT1074Bi

RFICs for 850 - 2400MHz

TRFIC

Figure 1. NF vs. Freq, varying temp.

Figure 4. P1dB (LNA + RF Mixer)

Figure 5. IP3 (IF Mixer + IF Amp)

RECEIVER

Figure 2. NF vs. Freq, varying Vdd

Figure 3. IP3 (LNA + RF Mixer)

Symbol

Wave

D0:A0:par(nf)

D0:A1:par(nf)

D0:A2:par(nf)

Params (lin)

1.4

1.6

1.8

2.2

2.4

2.6

2.8

3.2

3.4

3.6

3.8

4.2

4.4

4.6

4.8

5.2

5.4

5.6

5.8

6.2

Frequency (lin) (HERTZ)

800x

(Noise Figure Vs. Freq)

Symbol

Wave

D0:A0:par(nf)

D0:A1:par(nf)

D0:A2:par(nf)

Params (lin)

3.1

3.15

3.2

3.25

3.3

3.35

3.4

3.45

3.5

3.55

3.6

3.65

3.7

3.75

3.8

3.85

Frequency (lin) (HERTZ)

800x

(Noise Figure Vs. Freq)

Figure 6. P1dB (IF Mixer + IF Amp)

-40

-35

-30

-25

-20

-15

-10

-30

-25

-20

-15

-10

-5

One DB Compression

One dB Compression = -20 dBm

25C,3.0V, TYP, 15 dB Gain

Input Power (dBm)

Output Power (dBm)

RF Front-End IIP3, Post Layout

(Typical)

-1 20.000

-1 00.000

-80.000

-60.000

-40.000

-20.000

0.000

20.000

40.000

-50.000

-40.000

-30.000

-20.000

-1 0.000

0.000

P in (d B m )

IIP 3=-1 2dB m

P ow er G ain=1 9dB

-12 dBm

-20 dBm

120C

25C

-40C

3.0V

3.3V

2.7V

Symbol

Wave

D0:A0:v(ifout)

Voltages (lin)

2.3

2.4

2.5

2.6

2.7

2.8

2.9

3.1

3.2

3.3

3.4

3.5

3.6

3.7

Time (lin) (TIME)

50n

100n

150n

200n

250n

300n

350n

400n

450n

500n

550n

600n

650n

700n

750n

800n

1dB Compression of RF Front-end of bt1074b, post layout simulation, Typical (1db.sp, rx_rf_top.lnt, vco810_top_y.lnt)

-40

-35

-30

-25

-20

-15

-10

-5

-100

-80

-60

-40

-20

IP3(POSTLAYOUT SIM)with Gain Control R=30 (15 dB Gain)

IP3 = -9.2183 dBm

25C,3.0V, TYP

Input Power (dBm)

Output Power (dBm)

1st harmonic simulation point
3rd harmonic simulation point

-9.2 dBm

-22 dBm

May 29, 2001

Confidential and Proprietary Information of BTI Page 13

RFI

s for 850 - 2400MHz

TRFIC

850-950MHz RF TRANSCEIVER

BT1074Bi

APPLICATION INFORMATION:

The BT1074Bi is a complete RF transceiver which integrates the receiver, transmitter
and local oscillator functions into one chip. Designed to operate in TDD mode, the chip
supports ISM band applications, including DSS.

The example described here (and shown in the Application Circuit) shows the
BT1074Bi used in a 902-928MHz product. Only the RF VCO, IF VCO and power com-
biner impedance component matching values need to be changed to use the BT1074Bi
for other frequency bands (i.e. 868-870MHz).

Figure 8. Freq vs. Cap., varying vdd

RFVCO:

IFVCO:

TBD

Figure 9. Freq vs. Cap., varying temp.

Figure 10. Freq vs. Cap., varying vdd

Figure 7. Freq vs. Cap., varying temp.

-40C

25C

120C

2.7V

3.0V

3.3V

-40C

25C

120C

2.7V

3.0V

3.3V

TRANSMITTER:

May 29, 2001

Confidential and Proprietary Information of BTI Page 14

850-950MHz RF TRANSCEIVER

BT1074Bi

RFICs for 850 - 2400MHz

TRFIC

902-928MHz Example

The transmitter accepts I&Q inputs from the system interface which also provides the DC
reference level to M_REF pin. An on-chip RF filter removes spurious signals before
going to the on-chip power amplifier. RF outputs are differential and a power combining
network is required for converting to a single-ended interface with an output load (see
Application Circuit on page 15). A power control pin selects between high or low trans-
mission power mode, which ranges from -4dBm to +17dBm. The power level can also
be set with resistors at REXT2 and REXT1 pins.

In the receiver section, an on-chip bandpass filter is provided between the LNA output
and downconverter mixer input for optimum noise performance. The first IF outputs at
110.592MHz are differential and require a power combiner. The second IF mixer down-
converts the first IF signal from 110.592MHz to 10.7MHz by an external crystal clock
input at 99.892MHz. A gain-adjustable IF amplifier provides additional gain up to 20dB.

The RF local oscillator and the transmitter IF oscillator are conveniently provided on-chip
and can be used with an external dual PLL frequency synthesizer. Both the RF and IF
local oscillators require external tuning elements, as shown in the Application Circuit on
page 15.

The receiver, transmitter, and the two oscillators can each be put into sleep mode with
on-chip power-down control pins. These functions can be turned on or off by a micro-
controller. For example, in the receiving mode, the microcontroller will turn on the
receiver and will turn off the transmit function. The RF and IF VCOs will always be on
during the TX and RX mode. In the transmitting mode, the microcontroller will turn on the
transmitter and will turn off the receiver function.

The recommended usage of the BT1074Bi is shown in the digital spread spectrum sys-
tem block diagram on the next page in Figure A:

May 29, 2001

Confidential and Proprietary Information of BTI Page 16

850-950MHz RF TRANSCEIVER

BT1074Bi

RFICs for 850 - 2400MHz

TRFIC

APPLICATION CIRCUIT

I & Q INPUT MODULATION

GNDLNA

RF_INP

GNDLNA1P

RF_OUTP

GND_PA1

RF_OUTN

GND_PA2

VDDPA_GR

GND_PA3

REXT2

RF_INN

BT1074Bi

BTI

GNDLNA1N

REXT1

GND_PRE1

GND_PRE2

LEXTN

DDL

NA1

RMX_

OUTP

GND_DM

DD_

GND_DM

GND_I

X_OUT

2
_

I
N

GNDRX_BUF

DDL

NA2

VDD_

I
XERINP

RX_

VDDRX_

VDDRFVCOIN

RF_VCO_OUT

RFVCOCAPIN

GNDRFVCOIN

RF_VCO_CTRL

VDDRF_VCO

GNDRF_VCO

VDDIF_VCO

GNDIF_VCO

GNDIFBUF

IF_VCO_OUT

RF_VCO_EN

IFCAPIN

IF_VCO_CTRL

IF_VCO_GND

GND_IFVCOIN

ND_

PRE3

VDD_

PRE1

VDD_

PRE2

TX_

ND_UPC1

ND_UPC2

TX_

CNT

VDD_

UPC

GND_

IF2

L
EXTP

TXI

GND_

I
F

VDD_

I
F

VDD_

VCOIN

TXQ

Antenna

10K

12nH

3.3pF

1nF

2.2pF

5.6nH

560

6.8nH

100pF

15pF

100pF

18K

12pF

100pF

VddTX

VddRX

VddIFVCO

VddRFVCO

IF VCO In

RF VCO Power Down

VddTX

VddRX

VddRFVCO

VddIFVCO

RF VCO In

100pF

Rx Power Down

RF PLL Control

High / Low

PA Power Mode

Power Mode

3.3pF

330nH

220nH

270nH

VddRX

0.1uF

2.7nH

IF PLL Control

100pF

220

10.7MHz

99.

892 MHz

External VDD

15pF

100pF

220pF

5.6K

33nF

3.3K

2.7nF

18K

220pF

3.3K

27nF

1.8K

4.7nF

Dual

PLL

3.3pF

22pF

IL<12.2dB

3dB BW = 1.1MHz

fc =110.592MHz

B4542

0.1uF

BBY51-03W

39nH

8.2nH

ANTENNA

SWITCH

DEMODULATOR

RX_DATA OUT

Figure C

1.5k

1uF

MREF

INPUT

470

May 29, 2001

Confidential and Proprietary Information of BTI Page 17

RFI

s for 850 - 2400MHz

TRFIC

850-950MHz RF TRANSCEIVER

BT1074Bi

APPLICATION CIRCUIT

DIRECT INPUT MODULATION AT IFVCO

GNDLNA

RF_INP

GNDLNA1P

RF_OUTP

GND_PA1

RF_OUTN

GND_PA2

VDDPA_GR

GND_PA3

REXT2

RF_INN

BT1074Bi

BTI

GNDLNA1N

REXT1

GND_PRE1

GND_PRE2

LEXTN

DDL

NA1

RMX_

OUTP

GND_DM

DD_

GND_DM

GND_I

X_OUT

2
_

I
N

GNDRX_BUF

DDL

NA2

VDD_

I
XERINP

RX_

VDDRX_

VDDRFVCOIN

RF_VCO_OUT

RFVCOCAPIN

GNDRFVCOIN

RF_VCO_CTRL

VDDRF_VCO

GNDRF_VCO

VDDIF_VCO

GNDIF_VCO

GNDIFBUF

IF_VCO_OUT

RF_VCO_EN

IFCAPIN

IF_VCO_CTRL

IF_VCO_GND

GND_IFVCOIN

ND_

PRE3

VDD_

PRE1

VDD_

PRE2

TX_

ND_UPC1

ND_UPC2

TX_

CNT

VDD_

UPC

GND_

IF2

L
EXTP

TXI

GND_

I
F

VDD_

I
F

VDD_

VCOIN

TXQ

Antenna

10K

12nH

3.3pF

1nF

2.2pF

5.6nH

560

6.8nH

100pF

15pF

100pF

18K

12pF

56K

100pF

VddTX

VddRX

VddIFVCO

VddRFVCO

IF VCO In

RF VCO Power Down

VddTX

VddRX

VddRFVCO

VddIFVCO

RF VCO In

100pF

Rx Power Down

RF PLL Control

High / Low

PA Power Mode

Power Mode

3.3pF

330nH

220nH

270nH

VddRX

0.1uF

2.7nH

IF PLL Control

100pF

220

10.7MHz

99.

892 MHz

External VDD

15pF

470

100pF

220pF

5.6K

33nF

3.3K

2.7nF

18K

220pF

3.3K

27nF

1.8K

4.7nF

Dual

PLL

3.3pF

22pF

IL<12.2dB

3dB BW = 1.1MHz

fc =110.592MHz

B4542

0.1uF

BBY51-03W

39nH

TX MOD_IN

VddTX

100pF

56K

10K

6.8K

8.2nH

ANTENNA

SWITCH

DEMODULATOR

RX_DATA OUT

Figure B

LPF

May 29, 2001

Confidential and Proprietary Information of BTI Page 18

850-950MHz RF TRANSCEIVER

BT1074Bi

RFICs for 850 - 2400MHz

TRFIC

Package Dimensions

Hd D

Sym-

bol

Millimeter

Inch

Min.

Nom.

Max.

Min.

Nom.

Max.

0.10

.004

1.00

.039

0.2

.008

0.127

.005

9.90

10.00

10.10

0.390

0.394

0.398

9.90

10.00

10.10

0.390

0.394

0.398

0.50

0.020

11.90

12.00

12.10

0.468

0.472

0.476

11.90

12.00

12.10

0.468

0.472

0.476

0.45

0.60

0.75

0.018

0.024

0.030

1.00

0.039

0.08

0.003

10x10x1.0 64 LD TQFP PACKAGE:

The information provided herein is believed to be accurate and correct. BethelTronix, Inc. assumes no responsibility for the inaccuracies
or use of the information or the use of the described product. BethelTronix, Inc. reserves the right to make changes in circuit design and/
or specifications at any time without further notice. No patent rights or licenses to any of the circuits described herein are implied or
granted to any third parties.

Part Number BT1074Bi