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Digital-mode linear AGC amplifiers with
dual-mixer I & Q quadrature demodulator
Accurate, onboard local oscillator phase splitter
for digital quadrature demodulator
Four enable/powerdown modes, selectable from
two digital control pins, allow operation with
minimal supply current
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Applications
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IS-136 (North American dual-mode) cellular
radio portable and mobile terminals
Cellular radio base stations
Digital satellite communications
Multisymbol signaling receivers
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DIGITAL SECTION
V
CC
GND
ENBA
ENBD
VCM
AGC
LOGIC AND
BIAS
CONTROL
VARIABLE GAIN
梅4
I
CLK
Q
IF INPUT
ANALOG SECTION
AUDIO
RSSI
LO
Figure 1. General Block Diagram