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LG F3000 - Page 31

LG F3000
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3. TECHNICAL BRIEF
- 32 -
3.5.1 Baseband Transmit Section
1. The AD6537B Baseband Transmit Section is designed to support GMSK for both single-slot and
multi-slot application.
2. The AD6535 includes a digital GMSK modulator which is used for GSM application. The GMSK
modulator uses a ROM lookup table to modulate the serial data stream ffrom the BSPORT. The
GMSK modulator is based on 3GPP TS 45.004 ver.5.1.0 Release 5
3.5.2 Baseband Receive Section
1. This section consists of two identical ADC channels that process baseband in-phase(I) and
quadrature(Q) input signals.
AD6535
IP
IN
QP
QN
PA
BSIFS
BSDI
CSFS
CSDI
CSDO
Baseband
Serial
Por t
Control
Serial
Por t
GMSK
Modulator
Ramp
RAM
PGA
PGA
PGA
Tx
DAC
Tx
DAC
Ramp
DAC
SC
Filter
SC
Filter
SC
Filter
Active
CT Filter
Active
CT Filter
Active
CT Filter
Figure 3-9. AD6535 BASEBAND TRANSMIT SECTION
IP
IN
QP
QN
AD6535
BSOFS
BSDO
Baseband
Serial
Port
Digital
Filter
Rx
ADC
Rx
ADC
SC
Filter
SC
Filter
Digital
Filter
Othello
Figure 3-10. AD6535 BASEBAND RECEIVER SECTION

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