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Hardware Description; Power Supply Concept - Siemens S35i Service Manual

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Hardware Description

The handset consists of the following major integrated circuits:
1) E-GOLD (PMB 2850)
This IC is a combination of microprocessor and signal processor.
The microprocessor part of this component is responsible for controlling the keyboard, SIM-
Card, Flash and RAM. Furthermore it controls the power up/power down of the RF module
and sets the amplification of the PA.
The signal processor part of PMB 2800 is responsible for processing the Rx I/Q signals
(filtering, equalizing, speech and channel decoding).
Furthermore it does the speech and channel encoding and the GSMK modulation of the Tx
I/Q signals.
The coprocessor PMB 2805 is used to realize advanced features regarding coding of the
speech signal. These are:
Halfrate-Encoding
Halfrate-Decoding
Enhanced Fullrate Encoding
Enhanced Fullrate Decoding
Voice Activity Detection
Comfort Noise
3) GAIM (PMB 2906)
The GAIM (GAIM = GSM Analog Interfacing Module) provides the interface between the
analogue signals (I/Q, voiceband, PA-control, charging control signals) and its digital
representation.
4) Transceiver Circuit (Bright II HD155124F)
This circuit provides the following main functionalities:
Low Noise Amplifier (LNA) with a fixed amplification of +20dB to amplify the input RF
signal.
Mixer to mix down the RF signal to the Intermediate Frequency (IF)
Programmable IF amplifier with a dynamic range of 60dB ( -10dB ~+50dB in steps of
2dB).
Mixer to mix down the IF signal to the baseband, generating and inphase (I) and a
quadrature (Q) signal.
Offset compensation for the I/Q signals.
This circuit provides the IF synthesizer, the I/Q modulator, prescalers to regulate the RF
synthesizer and a buffer stage to feed the PA.
The antenna switch is mechanical, located in the connector for the external antenna.

Power Supply Concept

V1.0
10

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