LG M6100 Service Manual - Page 31

3. TECHNICAL BRIEF 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 AD6535 IP BSIFS BSDI Baseband Serial Port PGA Tx SC Active DAC Filter CT Filter IN GMSK Modulator QP PGA Tx SC Active DAC Filter CT Filter QN CSFS Ramp CSDI Control Serial RAM PGA Ramp SC Active PA CSDO Port DAC Filter CT Filter Figure 3-9. AD6535 BASEBAND TRANSMIT SECTION 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 BSOFS BSDO Baseband Serial Port Digital Filter Rx ADC SC Filter Digital Filter Rx ADC SC Filter Othello IP IN QP QN Figure 3-10. AD6535 BASEBAND RECEIVER SECTION - 32 -