Transmitter_Architectures for ...

Transmitter_ArchitecturesTransmitter Architectures System on Chip
Huainan Ma March 1, 2006

Transmitter Architectures
Two groups of Transmitter
not sharp only use filer

1. Mixer-based frequency upconversion (I/Q Modulator) 2. Phase-locked loop (PLL) based frequency up-conversion (Polar Modulator)

sharp

1. Mixer-based frequency up-conversion
Three types of the mixer-based up-converters:
1) 2) Direct up-conversion transmitter; Two-step in-direct up-conversion transmitter;

Features:
Mostly analog in nature, more susceptible to noise and coupling, Provide advantageous radio performance such as low spurious noise. Suffer from high cost of implementation, require high-Q, lowdistortion, low-noise band-pass filters

1.1

Direct up-conversion transmitter

1. I, Q are analog base-band signals, (from 8~10bit DACs) 2.