User Guide

PAMS
Technical Documentation
NSE–8/9
System Module
Page 2– 73
Issue 1 07/99
RF
The RF module converts the signal received by the antenna to a
baseband signal and vice versa.
It consists of a conventional superheterodyne receiver and a transmitter
for each band and also two frequency synthesizers for the required
mixing.
The architecture contains two integrated circuits, a CRFU3_D1 and a
SUMMA. They are both BiCMOS ASICs, which is a suitable technology for
integration of RF functions.
The CFRU3 includes:
– A LNA for each band with a step AGC
– Down converters for the receiver
– Image rejection upconversion mixers for the transmitter
– A prescaler for the 2 UHF VCO
– The SUMMA includes:
– An AGC amplifier for the receiver
– A receiver mixer for the 13 MHz down conversion
– PLLs for the UHF and VHF synthesizers
– IQ–modulators for the transmitter
– A power control circuit for the transmitter
The power amplifiers (PAs) are MMIC technology (Monolithic Microwave
Integrated Circuit). They include three amplifier stages with input,
interstage and output matching.