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Only for training and service purposes
3. TECHNICAL BRIEF
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3.5.2 FUNCTIONAL DESCRIPTION
Figure. 3.5.2 RECEIVER CHAIN BLOCK DIAGRAM
3. TECHNICAL BRIEF
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.