An active double-balanced even harmonic mixer implemented in a 0.35-μm SiGe BiCMOS process is described. The effect of local oscillator wave shape and duty cycle on conversion gain are examined. Measured data for an even harmonic mixer is compared to a conventional Gilbert cell mixer and applications to the front-end of a direct conversion receiver are described.
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Goldfarb et al. (2003) studied this question.
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