User Guide

CCS Technical Documentation 7 - System Module & UI
Company Confidential NMM-3
Issue 1 (11/2003) Copyright  2003 Nokia Corporation Page 7-31
Company Confidential
Description of the RF Related Converters
UEME:
• The single ended GSM RXIQ signals from HELGO are routed to the 12 bit AD con-
verters in UEME Figure 2. VREFRF02 is a reference voltage for the converters.
• GRF_temp is using channel 6 and WTX_temp channel 4 of the 11 channel AD
converter. GRF_temp is used for GSM temperature compensation and WTX_temp
for WCDMA TX gain temp. compensation (TX power control algorithm) and RX
AGC gain temp. compensation (RX AGC algorithm).
• 10 bit AuxDAC is used for GSM power control (TXC) and controlling the WCDMA
PA SMPS.
• AFC voltage is coming from an 11bit DAC.
• IPA1 (4 bit DAC) is sourcing the bias current (tuned in production) of the WCDMA
PA.
• VREFRF01 is the reference voltage for the RF ASICs.
TIKU:
• The differential current mode TXIQ signals are coming from TIKU. The resolution
of the DACs are in GSM mode 8 bits and in WCDMA 10 bits. GSM TXIQ signals are
routed from TEX to HELGO. The reference current (32 uA) of the converters is
Iref1 from TEX.
• 10 bits AuxDAC1 and AuxDAC2 are controlling the AGC stages in TEX and HEX.
The tuning ranges are 0…1024uA. Iref1 is the reference current for AuxDAC1 and
Iref2 for AuxDAC2. TEX is sourcing both reference currents Iref1 and Iref2. Iref1 is
based on TEX internal resistor and Iref2 external resistor.
• 6 bit AD converters are used for differential WCDMA RXIQ signals. The reference
current for the converters is Iref2. The reference voltages (VrefL/M/H) come from
REX.