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http://dx.doi.org/10.6109/jkiice.2012.16.5.1023

A Design of MMIC Mixer for I/Q Demodulator of Non-contact Near Field Microwave Probing System  

Ryu, Keun-Kwan (국립한밭대학교 전자.제어공학과)
Kim, Sung-Chan (국립한밭대학교 전자.제어공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.16, no.5, 2012 , pp. 1023-1028 More about this Journal
Abstract
A MMIC (Monolithic Microwave Integrated Circuit) mixer chip using the Schottky diode of an GaAs p-HEMT process has been developed for the I/Q demodulator of non-contact near field microwave probing system. A single balanced mixer type is adopted to achieve simple structure of the I/Q demodulator. A quadrature hybrid coupler and a quarter wavelength transmission line for 180 degree hybrid are realized with lumped elements of MIM capacitor and spiral inductor to reduce the mixer chip size. According to the on-wafer measurement, this MMIC mixer covers RF and LO frequencies of 1650MHz to 2050MHz with flat conversion loss. The MMIC mixer with miniature size of $2.5mm{\times}1.7mm$ demonstrates conversion loss below 12dB for both variations of RF and LO frequencies, LO-to-IF isolation above 43dB and RF-to-IF isolation above 23dB, respectively.
Keywords
Mixer; Single Balanced; Balun; microstripline; MMIC;
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