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3. TECHNICAL BRIEF
3.5.2 FUNCTIONAL DESCRIPTION
3.5.2.1 Receiver
The X-GOLD™213 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
Figure. 3.5.2 RECEIVER CHAIN BLOCK DIAGRAM
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3. TECHNICAL BRIEF
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