LG C3400 Service Manual page 27

3. TECHNICAL BRIEF
3.6.1 Baseband Transmit Section
1. The AD6535 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.
BSIFS
BSDI
CSFS
CSDI
CSDO
3.6.2 Baseband Transmit Section
1. This section consists of two identical ADC channels that process basebandin-phase(I)
and quadrature(Q) input signals.
BSOFS
BSDO
AD6535
Baseband
Serial
Port
GMSK
Modulator
Ramp
Control
RAM
Serial
Port
Figure 3-12. AD6535 BASEBAND TRANSMIT SECTION
AD6535
Digital
Baseband
Filter
Serial
Port
Digital
Filter
Figure 3-13. AD6535 BASEBAND RECEIVER SECTION
Tx SC
DAC Filter
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