Receiver Path Description; Frequency Generating Section Description - Motorola MTH500 Service Manual

Overview
The transmitter path consists of a novel cartesian feedback loop that contains the
forward and loop feedback paths. The forward path includes the low noise ODCT
(Offset Direct Conversion Transmitter), Balun, Attenuator, and Power Amplifier.
The loop feedback path includes the directional coupler, attenuator, and LNODCT
(Low Noise Offset Direct Conversion Transmitter) ASIC.
The cartesian Feedback output power passes to the antenna through the Isolator,
Antenna Switch, and Harmonic Filter.

Receiver Path Description

The receiver path includes the Antenna Switch, SAW, LNA, ceramic filter, mixer,
Crystal Filter, and WPIC (World Phone IC). The first IF consists of the Crystal
Filter and WPIC ASIC.

Frequency Generating Section Description

The frequency generating section provides description of the following main com-
ponents: Fractional-N Synthesizer, REF. oscillator, Main VCO, WPIC ASIC Syn-
thesizers, LNODCT ASIC Synthesizer, External Offset and second LO
Synthesizer, DSP PLL, and Host PLL.
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