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Transceiver - - Receiver
RXIN
RXIP
RXQN
RXQP
VGA
RX path is a direction down conversion architecture that eliminates the need for Intermediate Frequency (IF) components.
The device includes three bands integrated LNAS, a quadrate demodulator, baseband amplifier circuit with I/Q outputs
and three stages of DC-offset correction.
The DCOC correction loop ensures DC-offsets, generated in CX74963, do not overload baseband chain.
The receiver can be calibrated to optimize IP2 performance, which ensures limited baseband interfering signal amplitude.
The CX74963 also features an integrated, fully programmable, sigma-delta fraction-N synthesizer suitable for GPRS
multi-slot operation.
DCOC
Figure 5.4. Receiver block diagram
– 5-5 –
RX LO
source from chip
RF SAW
FILTER
LNA
Antenna
900
T/R
Switch
&
Display
1800
1900
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