Ka-band Six-port Direct Conversion Receiver Front-end And Wideband Mmic Amplifier Design

This thesis which is reported the research on the six-port direct conversion receiver is composed of two parts:1. Introduce the background of the six-port direct conversion receiver, compare with the other types of receiver.2. Simulation the whole system in ADS (Advanced Design System) to prove that the six-port direct conversion receiver can demodulate the QPSK signal.The research of PHEMT MMIC broadband monolithic power amplifier in this thesis is also reported. Major contents are abstracted as following:A broadband two-stage MMIC medium-power amplifier operating from 6 to 20 GHz is developed by using 0.15μm low-noise PHEMT process in UMS (United Monolithic Semiconductor). The chip size is 0.92 mm×1.02mm. And the first stage PHEMT with gate width of 6×35μm was used to drive the second stage PHEMT with gate width of 8×70μm. With a single 3-volt DC power supply, each gain stage is self-biased for class-A operation for optimal power output with minimal distortion, the two-stage feedback power amplifier has 15dB small-signal gain over 6 ~ 20GHz , The output power at 1dB compression are 17dBm at 20GHz. The designing simulation results indicate that this method is simple and feasible.