Low Noise Design Strategies for Mixers and Amplifiers

Conference: GeMIC 2008 - German Microwave Conference
03/10/2008 - 03/12/2008 at Hamburg-Harburg, Germany

Proceedings: GeMIC 2008

Pages: 4Language: englishTyp: PDF

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Yan, Lei; Johansen, Tom Keinicke; Krozer, Viktor (ElectroScience, Ørsted DTU, Technical University of Denmark, Oerstedplads 348, 2800 Kgs. Lyngby, Denmark)

The paper presents analytical formulas for the phase-noise in microwave amplifiers and mixers at low frequencies, which have been verified using circuit CAD tools. These expressions are used to improve the RF and 1/f noise performance of bipolar and FET circuits. It has been found that using circuit design approaches for wideband circuit operation improves the phase-noise performance. Wideband operation using series/shunt peaking and current compensation techniques has been studied resulting in an overall noise figure improvement by up to 7 dB at all frequencies in case of a HEMT Gilbert cell mixer circuit.