LG B2000 Service Manual page 31

3. TECHNICAL BRIEF
3.6.1 BasebandTransmit Section
1. The AD6537B BasebandTransmit Section is designed to support GMSK for both
single-slotand multi-slot application.
2. The transmit channel consists of a digital GMSK modulator, a matched pair of 10-bit
DACsanda matched pair of reconstruction filter.
AD6537B
BSIFS
Baseband
BSDI
Serial
Port
CSFS
Control
CSDI
Serial
CSDO Port
3.6.2 BasebandTransmit Section
1. This section consists of two identical ADC channels that process basebandin-phase(I) and
quadrature(Q) input signals.
AD6537B
BSOFS
Baseband
BSDO
Serial
Port
GMSK
Modulator
Ramp
RAM
Figure 3-12 AD6537B BASEBAND TRANSMIT SECTION
Digital
Filter
Digital
Filter
Figure 3-13 AD6537B BASEBAND RECEIVER SECTION
SC
Tx
Filter
DAC
Tx SC
DAC Filter
Ramp SC
DAC Filter
Rx SC
ADC Filter
Rx SC
ADC Filter
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PGA
Active
CT Filter
PGA
Active
CT Filter
PGA
Active
CT Filter
Othello
IP
IN
QP
QN
IP
IN
QP
QN
PA