Functional Description - LG A175 Service Manual

3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
3.5.1 GENERAL DESCRIPTION
The PMB8810 RF subsystem is designed for dual-band GSM voice and data applications (GPRS class 12).
The system can be configured to support one low band, GSM850 or EGSM900, and one high band,
DCS1800 or PCS1900. A block diagram of the RF subsystem is given in Figure 3-4-1.

3.5.2 FUNCTIONAL DESCRIPTION

3.5.2.1 Receiver
The X-GOLDTM110 receiver is based on the Direct Conversion Receiver architecture (DCR) and can be
configured to support one low band, GSM850 or EGSM900, and one high band, DCS1800 or PCS1900. A
fully differential receive path is chosen to suppress on-chip interference.
The analog section of the receiver contains two LNAs, quadrature mixer, low-pass filter, and a high
resolution continuous-time delta-sigma analog-to-digital converter.
Figure. 3.5.2 RECEIVER CHAIN BLOCK DIAGRAM
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