RF142 Просмотр технического описания (PDF) - Conexant Systems

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RF142

Heterojunction Bipolar Transistor Power Amplifier Dual-Band Controller for GSM and PCS Applications

Conexant Systems 

Power Amplifier Controller

RF142

Gain Shaper. The output of the integrator is fed to the gain

shaping circuit that drives the gain control input of the external

RF PA. The midpoint voltage of the PA control voltage VPC, is

determined by the VMP input. The VMP input is obtained by

connecting a resistor divider to the 2.4 V reference output,

VREF. The integrator in the integrating error amplifier is used to

stabilize the loop.

The maximum voltage obtainable on VPCGSM and VPCDCS is

generally 1 V below VCC2 (pin 20). Therefore, it may be more

desirable to use a higher voltage than VCC.

Output Stages. Each of the two output stages is dedicated to a

frequency band: one for GSM900MHz and one for

GSM1800/PCS1900 MHz. The selection of the output stage is

determined by the BAND select signal. A high signal selects the

VPCDCS as the output pin and a low signal selects VPCGSM

as the output pin. When either output is inactive, its residual

output level is extremely low to ensure that the inactive PA is

completely off.

DC Bias Block. The DC bias block provides voltage bias to the

whole chip, which may be put in standby mode using the

ENABLE digital input control pin (pin 6). The ENABLE pin is

compatible with TTL levels. When the ENABLE pin is driven

high, the device is enabled.

Electro-Static Discharge (ESD) Sensitivity

The RF142 is a static sensitive electronic device. Do not operate

or store it near strong electrostatic fields. Take proper ESD

precautions.

Table 2. Absolute Maximum Ratings

Parameter

Storage Temperature

Supply Voltage

Power Dissipation

Input Voltage Range

Minimum

–40

–0.3

--

–0.3

Maximum

+125

5.0

500

Vcc

Units

°C

V

mW

V

Table 3. RF142 Recommended Operating Conditions

Parameter

Supply Voltage (Vcc)

Operating Temperature

Minimum

2.7

–30

Typical

3.6

+25

Maximum

4.8

+85

Units

V

°C

Parameter

Detector frequency range

Detector monotonic dynamic range

Detector gain

Detector stability

Detector non-linearity error

VAPC common mode range

VAPC differential range

VAPC input impedance

VREF

GSM Maximum Control Voltage

DCS Maximum Control Voltage

Table 4. RF142 Electrical Characteristics (1 of 2)

(TA = 25 °C, Vcc = 3.6 V)

Symbol

f

Test Condition

Maximum input power and over temperature range.

Minimum input power and over temperature range.

RFPC ± from –40 dBm to +8 dBm

ZVAPC

VREF

VPCGSM

VPCDCS

Band <= 0.8 V

Ivpcgsm <= 75 mA

Band >= 1.90 V

Ivpcdcs <= 50 mA

Min

800

50

2.2

Vcc-1.1

Typ

15

1.35

±1

20//5

2.4

Vcc-1.0

Max

2000

±0.5

±3

±2

2.6

Vcc-0.9

Vcc-1.1 Vcc-1.0 Vcc-0.9

Units

MHz

dB

mV/dB

dB

dB

dB

V

Vp-p

kΩ//pF

V

V

V

100774A

Conexant

Proprietary Information and Specifications are Subject to Change

3

September 7, 2000

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