Only For Training And Service Purposes - LG GM210 Service Manual

3. TECHNICAL BRIEF
3.3.2.2 Transmitter
Transmitter Overview
The highly integrated transmit section of the AD6546 radio has been designed to fully support 8 PSK
modulation for EDGE applications, and GMSK modulation for GSM. A translational loop is used for
phase modulation, and for 8 PSK additional envelope (AM) circuits are enabled to implement a Polar
modulator.
Quadrature Modulator
The Quadrature modulator takes the baseband I/Q signals and converts this onto a complex
modulated signal (containing both amplitude and phase information) at the TX IF frequency. After
bandpass filtering the TX IF signal is used as the reference
input to the Phase Frequency Detector (PFD) for the transmit PLL, and in EDGE mode also provides
the input to the Reference Path Log Detector circuit for AM restoration.
LGE Internal Use Only
LGE Internal Use Only
Figure 3-3-3 AD6546 TRANSMITTER
- 28 -
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes