Motorola GP340 ATEX Información de servicio - Página 9

Navegue en línea o descargue pdf Información de servicio para Radio Motorola GP340 ATEX. Motorola GP340 ATEX 24 páginas. Professional radio, power distribution and controller
También para Motorola GP340 ATEX: Hoja de especificaciones (5 páginas), Manual del usuario (31 páginas), Hoja de especificaciones (2 páginas), Manual del usuario (30 páginas), Manual del usuario (30 páginas), Manual básico del usuario (10 páginas), Información de servicio (32 páginas), Información de servicio (30 páginas), Información de servicio (26 páginas), Información de servicio (31 páginas), Información de servicio (43 páginas), Información de servicio (30 páginas)

1.0

Introduction

This chapter provides a detailed theory of operation for the radio RF circuits. Refer to the relevant

section of this manual for details of the operation of the Controller Circuits.

2.0

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

The Lowband transmitter consists of the following basic circuits :

Antenna switch/harmonic filter.

Antenna matching network.

Power Control Integrated Circuit (PCIC).

2.1

Power Amplifier (PA)

The power amplifier (PA) consists of two LDMOS devices:

PA driver IC, U101.

PA final stage, Q100.

The LDMOS driver (U101) provides 2-stage amplification using a supply voltage of 7.3V. The

amplifier is capable of supplying an output power of 0.3W (pins 6 and 7) with an input signal of 2mW

at (pin16). The current drain is typically 120mA while operating in the frequency range of

29.7 - 50 MHz. The power output of this stage is varied by the power control loop which controls the

voltage on pin 1.

SPI Bus

P C I C

V Control

Power Amplifier (PA)

PA Driver

Figure 2-1 Lowband Transmitter Block Diagram.

THEORY OF OPERATION

Antenna switch bias

Gate bias

Antenna Switch/

PA Final

Harmonic Filter

Stage

Chapter 2

Antenna

Matching

Network