Lge Internal Use Only - LG -S367 Service Manual

3.5.2 FUNCTIONAL DESCRIPTION
3.5.2.1 Receiver
The X-GOLD™215 dual-band receiver is based on a Direct Conversion Receiver (DCR) architecture. Input
impedance of the LNAs is optimized to achieve a matching without (external) high quality inductors. By use
of frequency dividers (by 2/4) the LO frequency is derived from the RF frequency synthesizer.
The receive path is fully differential to suppress the on-chip interferences and reduce DC-offsets. The analog
chain of the receiver contains two LNAs (low/high band), a quadrature mixer followed by an analog
baseband filter and 14-bit continuous-time delta-sigma analog-to-digital converter. The filtered and digitized
signal is fed into the digital signal processing chain, which provides decimation, DC offset removal and
programmable gain control.

LGE Internal Use Only

LGE Internal Use Only
Figure. 3.5.2 RECEIVER CHAIN BLOCK DIAGRAM
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3. TECHNICAL BRIEF
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