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Copyright 2005© Siemens AG
Page 25 of 53
TD_Repair_L2.5_A70_A75_R1.0.pdf Release 1.0
E-GOLDlite is designed as a single chip solution that integrates the digital and mixed signal
portions of the baseband. It uses a leading 0.13 µm technology with a core voltage of 1.5 V.
This allows and high performance mobile station with a large set of features at very low cost.
E-GOLDlite has a flexible set of interfaces that allows a wide choice of communication
interfaces and supports a high multimedia data rate.
E-GOLDlite is powered by C166
®
S CPU and TEAKLite
®
DSP cores.
The E-GOLDlite is placed in a S-LF2BGA201 (a “flipchip” with 201 pins) with 0,5mm Ball-
Pitch.
The E-GOLDlite is suited for mobile stations operating in the GSM850/900/1800/1900 bands.
In the receiver path the antenna input signal is converted to the base band, filtered, and
amplified to target level by the RF transceiver chipset. The resulting differential I and Q
baseband signals are fed into the E-GOLDlite. The A-to-D converter generates two 6.5 Mbit/s
data streams. The decimation and narrowband channel filtering is done by a digital baseband
filter in each path. The DSP performs:
1. The GMSK equalization of the received baseband signal.
2. Channel decoding, which is supported by an hardware accelerator.
The recovered digital speech data is fed into the speech decoder. The E-GOLDlite supports
fullrate, halfrate, enhanced fullrate and adaptive multirate speech CODEC algorithms.
The generated voice signal passes through a digital voiceband filter. The resulting 4 Mbit/s
data stream is D-to-A converted by a multi-bit-oversampling converter, postfiltered, and
amplified by a programmable gain stage.
The output buffer can drive a handset ear-piece or an external audio amplifier.
In the transmit direction the microphone signal is fed into a programmable gain amplifier. The
prefiltered and A-to-D converted voice signal forms a 2 Mbit/s data stream. The oversampled
voice signal passes a digital decimation filter.
Speech and channel encoding (including voice activity detection (VAD) and discontinuous
transmission (DTX)) as well as digital GMSK modulation is carried out by the E-GOLDlite.
The digital I and Q baseband components of the GMSK modulated signals (48-times
oversampled with 13 MSamples/s) are D-to-A converted. The analog differential baseband
signals are fed into the RF transceiver chipset.
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