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Preliminary Information

SATURN

SATURN

CDMA/AMPS dual Band IF Receiver for Digital Phones

Preliminary Information

DS4721

Issue 4.2

April 1999

Features

q

Selectable IF input buffers with characteristic

impedance suitable for interface to IF CDMA and

FM SAW filter outputs

AGC amplifiers with 90dB of variable gain, fully

compensated for temperature variation

IQ demodulator with accurately defined output DC

level and low DC offsets

LO operating at twice frequency with high accuracy

quadrature generation

Sophisticated power management control operation

Overload indicator

Odering Information

SATURN/KG/QP1S

SATURN/KG/QP1T

q

q

Description

The SATURN circuit is designed for use in dual band dual

mode mobile phones (CDMA/AMPS). The circuit is

designed to be compataible with digital baseband and

mixed signal circuit chips from Mitel (Planet Chip-set)

and Qualcomm (MSM2 and BBA). A wideband AGC

amplifier allows the input of CDMA or AMPS signal paths

with a range power management control options.

q

q

q

IF VCC

IF VEE

IF OUT

FM IFIN

I OUT

CDMA IFIN

Q OU T

AGC

Gain

Control

Temperature

Comp.

DLL

BAND 1900

Overload

Indicator

STARTUP

ENABLE

MODE CDM

PRESCALER

Mode

Control

VHF VCC

VHF VEE

Figure 1 Block diagram

OVERLOAD DET

VHF BUF

VHF RES

1

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