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Journal of the Korean Institute of Electromagnetic and Science 2006;6(1):18-23.
An MMIC Broadband Image Rejection Downconverter Using an InGaP/GaAs HBT Process for X-band Application
Jei-Young Lee, Young-Ho Lee, Gary P. Kennedy, Nam-Young Kim
Department of Electronic Engineering, Kwangwoon University
Abstract
In this paper, we demonstrate a fully integrated X-band image rejection down converter, which was developed using InGaP/GaAs HBT MMIC technology, consists of two single-balanced mixers, a differential buffer amplifier, a differential YCO, an LO quadratue generator, a three-stage polyphase filter, and a differential intermediate frequency(IF) amplifier. The X-band image rejection downconverter yields an image rejection ratio of over 25 dB, a conversion gain of over 2.5 dB, and an output-referred 1-dB compression power$(P_{1dB,OUT})$ of - 10 dBm. This downconverter achieves broadband image rejection characteristics over a frequency range of 1.1 GHz with a current consumption of 60 mA from a 3-V supply.
Key words: X-band Image Rejection Downconverter, Single-Balanced Mixer, Voltage Controlled Oscillator, LO Quadrature Generator, Polyphase Filter

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