Abstract
A noise analysis of gate mixers used for down-conversion is presented in this paper. The single sideband (SSB) noise figure is calculated and optimized based on a simplified analytical expression using all noise-source contributions and harmonic-balance simulation. Analytical and simulated input-impedance optimizations are developed to reduce the noise figure. Two mixers are designed with two different configurations (conventional and low-noise configurations) in order to confirm the calculated, simulated, and optimized noise figures. The noise-figure performances are measured and compared for the two configurations. The LO, RF, and IF frequencies chosen for this test are 9.5, 11, and 1.5 GHz, respectively. It is shown that the noise figure is reduced by 4 dB in the low-noise mixer configuration. Good agreement is obtained between calculated, simulated, and experimental noise figures. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 307–311, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20619
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