An Analytical Approach in Analysis of Local Oscillator Near-the-Carrier AM Noise Suppression in Microwave Balanced Mixers

• Published in: IEEE transactions on microwave theory and techniques Vol. 57; no. 4; pp. 760 - 766
• Main Authors: Kheirdoost, A., Banai, A., Farzaneh, F.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-04-2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: AM noise; Applied sciences; balanced mixers; Balancing; Circuit noise; Circuit properties; Conversion; conversion matrix; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; Intermediate frequency; Local oscillators; Mathematical analysis; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; microwave mixers; Microwave theory and techniques; Microwaves; mixer noise; Mixers; Noise; Noise cancellation; Noise generators; Oscillators; Oscillators, resonators, synthetizers; Phase noise; Radio frequency; Radiofrequency amplifiers; Temperature; Local oscillator; Microwave mixer; balanced mixers; Noise reduction; conversion matrix; Analytical method; microwave mixers; Signal processing; Matrix method; Mixers (circuits); mixer noise; AM noise
• ISSN: 0018-9480; 1557-9670
• DOI: 10.1109/TMTT.2009.2015106

In this paper, a new formulation based on conversion matrix method is proposed to analyze ldquonear-the-carrier local ocillator (LO) noiserdquo down conversion to IF in microwave mixers. This method could be easily applied to analyze LO noise down conversion in any type of mixer. Practical results of this method have been compared with the envelope method and measurement results. It is shown that despite the conventional AM noise suppression in balanced mixers, the near-the-carrier LO noise suppression does not occur necessarily at the center frequency of hybrid in balanced mixers. AM noise suppression values are predicted precisely.