PrJ

02/27/03

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a

Diversity IF to Baseband

GSM/EDGE Narrowband Receiver

Preliminary Technical Data

AD6650

FEATURES

Digital VGA

I & Q Demodulators

Active Low Pass Filters

Dual Wideband ADC

Programmable Decimation and Channel Filters

Phase Locked Loop Circuitry

Serial Data Output Ports

IF Frequencies 70-300MHz

10 dB Noise Figure

+24 dBm Input IP2

-13 dBm Input IP3

3.3 Volt I/O and CMOS Core

JTAG Boundary Scan

APPLICATIONS

GSM/EDGE Single Carrier and Diversity Receivers

Micro and Pico Cell Systems

Wireless Local Loop

Smart Antenna Systems

Software Radios

In Building Wireless Telephony

PRODUCT DESCRIPTION

The AD6650 is a diversity, IF to baseband receiver for

GSM/EDGE. This narrow band receiver consists of an

integrated DVGA, IF-to-baseband I&Q demodulators, low-

pass filtering, and a dual wideband ADC. The chip can

accommodate IF input frequencies from 70 MHz to 300 MHz.

This receiver architecture is designed such that only one

external SAW filter(one for main and one for diversity) is

required in the entire Rx signal path to meet GSM/EDGE

blocking requirements.

Digital decimation and filtering circuitry is embedded on chip

to generate serial output I&Q

filters remove unwanted signals and noise outside the channel

of interest. In addition, programmable RAM Coefficient

filters allow anti-aliasing, matched filtering, and static

equalization functions to be combined in a single, cost-

effective filter.

The AD6650 is part of a complete GSM/EDGE receive and

transmit chipset. Other components in this chipset are: RF to

IF amplifier/mixers, receive and transmit frequency hopping

synthesizers, and a baseband to IF transmit modulator and

ramping chip.

Figure 1. AD6650 Functional Block Diagram