Transmitter_ArchitecturesTransmitter Architectures System on ChipHuainan Ma March 1, 2006Transmitter ArchitecturesTwo groups of Transmitternot sharp only use filer1. Mixer-based frequency upconversion (I/Q Modulator) 2. Phase-locked loop (PLL) based frequency up-conversion (Polar Modulator)sharp1. Mixer-based frequency up-conversionThree 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1.1Direct up-conversion transmitter1. I, Q are analog base-band signals, (from 8~10bit DACs) 2. ……