MGCM02

The MGCM02 provides the complete IF to baseband I and Q including channel filtering for IS136/AMPS.

The receive input is at an IF frequency up to 200MHz. This is downconverted to an internal IF of 60kHz and filtered by a switched capacitor bandpass filter which also provides image rejection. The 60kHz signal is then demodulated to give baseband I and Q signals. Over 100dB of gain control is provided. The baseband outputs can be input directly to an A to D converter.

The internal FM discriminator can be used for demodulating AMPS signals. The receive path also provides RSSI.

Transmit I and Q baseband signals from D to A converters can be input directly to MGCM02 which provides reconstruction filters and a variable gain buffer.

The two PLL synthesisers are used for generation of the receive and transmit IF LO signals.