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A/D conversion of MIC-Path signals incl. coding
The Microphone signals (MICN2, MIP2, MICP1, MICN1) arrive at the voiceband part of the EGOLG+.
For further operations the signals will be converted into digital information, filtered, coded and finally
formed into the GMSK-Signal by the internal GMSK-Modulator. This so generated signals (RF_I, RF_IX,
RF_Q, RF_QX) are given to the Bright IC in the transmitter path.
D/A conversion of EP-Path signals incl. decoding
Arriving at the baseband-Part the demodulated signals (RF_I, RF_IX, RF_Q, RF_QX) will be filtered
and A/D converted. In the voiceband part after decoding (with help of the µC part) and filtering the
signals will be D/A converted amplified and given as (EPP1_FIL, EPN1_FIL) to the Power Supply ASIC.
Generation of the PA Control Signal (PA_RAMP)
The RF output power amplifier needs an analogue ramp up/down control voltage. For this the system
interface on EGOLD+ generates 10 bit digital values which have to be transferred serially to the power
ramping path. After loading into an 10 bit latch the control value will be converted into the corresponding
analogue voltage with a maximum of ~2V
V 1.10
A52/A55/C55 IFX
Page 21of 45
Company Confidential © Copyright Siemens AG
Key-Value
ICM MP CCQ GRM
08/03
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