Figure 3-4. Receiver Block Diagram (700/800 Mhz); Figure 3-5. Receiver Block Diagram (900 Mhz); Figure 3-6. Gps Diagram - Motorola APX 1000 Basic Service Manual

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DIG_CTRL_ATTH

DIG_CTRL_ATTH

The GPS signal is tapped at the antenna port via a series resonant network (diplexer) which provides

a very low capacitive load to the transceiver. The diplexer circuitry provides rejection to radio band

signals up to ~1GHz which serves as isolation between the radio RF and GPS signal paths. The

GPS signal is filtered though a GPS SAW filter - LNA – Saw filter chain before going into the TI GPS

IC for processing.

Figure 3-4. Receiver Block Diagram (700/800 MHz)

To Radio transceiver path

GPS Receiver Circuit

Basic Theory of Operation: Analog Mode of Operation

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