AD6650

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, lowpass 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 or 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 data streams. The decimating 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, costeffective 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.