User Guide

PAMS
System Module DB6
NHB–3
Technical Documentation
Original 26/97
Page 4–37
Signal name Signal description To
TXQP,TXQN differential TX quadrature signal RF
TXIP,TXIN differential TX inphase signal RF
PDATA0 front end AGC–data RF
External Signals and Conections, Bidirectional
Signal name Signal description To/From
RFIDA(11:0) 12–bit data bus ASIC
Block Description
The RFI provides A/D conversion of the in–phase (RXI) and quadrature (RXQ)
signals in receive path. It has 12 bit sigma–delta A/D converters and the sam-
ple rate is 541.667 kHz.
Analog transmit path includes 8 bit D/A converters to generate the in–phase
(TXI) and quadrature (TXQ) signals. RFI has differential outputs for TXI and
TXQ. The sample rate is 1.0833 MHz.
There is 11 bit D/A converter for automatic frequency correction. The sample
rate is 1.3542 kHz.
Power ramp is done with 10 bit D/A converter. The sample frequency is 1.0833
MHz.
Front end AGC control is done with PDATA0 output. Main part of AGC is con-
trolled by TXC.
The RFI has 12 bit data bus to the ASIC. The registers in the RFI are accessed
using 4 address bits. Control and clock signals are coming from the ASIC.
The RFI has external 4.096 V voltage reference.
Main Components
– RFI ASIC
– 4.096 V external voltage reference LM4040 for RFI