Motorola GP340 ATEX Service-informatie - Pagina 9

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1.0

This Chapter provides a detailed theory of operation for the 300-350MHz circuits in the radio. For

details of the theory of operation and trouble shooting for the the associated Controller circuits refer

to the Controller Section of this manual.

2.0

(Refer to Figure 2-1 and the Transmitter schematic diagram)

The transmitter contains five basic circuits:

antenna switch,

harmonic filter,

antenna matching network,

power control integrated circuit (PCIC).

From

VCO

2.1

Power Amplifier

The power amplifier consists of two devices:

9Z67 LDMOS driver IC (U101) and

PRF1507 LDMOS PA (Q110).

The 9Z67 LDMOS driver IC contains 2 stages of amplification with a supply voltage of 7.3V.

This RF power amplifier is capable of supplying an output power of 0.3W (pin 6 and 7) with an input

signal of 2mW (3dBm) (pin16). The current drain would typically be 160mA while operating in the

frequency range of 300-350MHz.

P CI C

Vcontrol

Power

Amplifier

Driver

Figure 2-1 Transmitter Block Diagram.

THEORY OF OPERATION

Vcontrol

P A Final

Antenna Switch/

S t a g e

Harmonic Filter

Chapter 2

Antenna

Matching

Network