Receiver Section - Motorola MTM700 Detailed Service Manual

4.2 - 2

Receiver Section

The receiver section includes the following main components:
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The IF Digitizing Subsystem performs the following functions:
• Carries out amplification and down conversion of the signal into the second IF.
• Performs IF AGC.
• Converts the second IF analog signal into baseband digital I & Q format.
• Transmits the I & Q baseband data to the DSP for further processing.
• Synthesizes the second LO frequency.
• Synthesizes the Sigma-Delta clock.
• Calculates the received signal strength.
MTM700 Mobile Radio / Detailed Service Manual
Antenna Switch
Limiter
Front Pre-selector Filter
Low Noise Amplifier (LNA)
Second Pre-selector Filter
Mixer
IF Filter
IF Amplifier
Dynamic Range Extension Circuit
IF Digitizing Subsystem
THEORY OF OPERATION (800 MHz)