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Hardware Description
The handset consists of five major integrated circuits:
1) GOLD-µC (PMB 2706)
This microprocessor is responsible for controlling the keyboard, SIM-Card,
EEPROM, Flash and RAM.
Furthermore it interfaces the GOLD-SP (PMB 2707), controls the power up/power
down of the RF module and sets the amplification of the PA.
2) GOLD-SP (PMB 2707)
This signal processor 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.
3) GAIM (PMB 2905)
The GAIM provides the interface between the analogue signals (I/Q, voiceband, PA-
control) and its digital representation.
4) Receiver Circuit (PMB 2405/07)
This circuit provides the following main functionalities:
a) Low Noise Amplifier (LNA) with a fixed amplification of +20dB to amplify the input
RF signal.
b) Mixer to mix down the RF signal to the Intermediate Frequency (IF)
c) Programmable IF amplifier with a dynamic range of 60dB ( -10dB ... +50dB in
steps of 2dB)
d) Mixer to mix down the IF signal to the baseband, generating and inphase (I) and a
quadrature (Q) signal.
e) Offset compensation for the I/Q signals.
5) Transmitter Circuit PMB 2240/45
This circuit provides the IF synthesizer, the I/Q modulator, prescalers to regulate the
RF synthesizer and a buffer stage to feed the PA.
TH
The antenna switch is mechanical, whenever you plug in the bottom connector,
the handset will switch to its external antenna.
V1.3
Private Communication Systems
12
Mobile Phones
PN MP ST
D. Schnoor
10/97
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