LG S5000 Service Manual page 30

3.6.1 Baseband Transmit Section
1. The AD6537B Baseband Transmit Section is designed to support GMSK for both single-slot and
multi-slot application.
2. The transmit channel consists of a digital GMSK modulator, a matched pair of 10-bit DACs and a
matched pair of reconstruction filter.
Figure 3-12. AD6537B BASEBAND TRANSMIT SECTION
AD6537B
BSIFS
Baseband
BSDI
Serial
Port
CSFS
Control
CSDI
Serial
Port
CSDO
3.6.2 Baseband Transmit Section
1. This section consists of two identical ADC channels that process baseband in-phase(I) and
quadrature(Q) input signals.
Figure 3-13. AD6537B BASEBAND RECEIVER SECTION
AD6537B
BSOFS
Baseband
BSDO
DAC
GMSK
Modulator
DAC
Ramp
RAM
Ramp
DAC
Digital Rx
Filter ADC
Serial
Port
Digital Rx
Filter ADC
3. TECHNICAL BRIEF
Tx SC Active
Filter CT Filter
Tx SC Active
Filter CT Filter
SC Active
Filter CT Filter
IP
SC
Filter
IN
QP
SC
Filter
QN
- 31 -
IP
PGA
IN
QP
PGA
QN
PGA
PA
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