Mixer-First Receiver with wide-RF Range

In the Passive Mixer first receiver, four mosfet, and four baseband impedance can synthesize High-Q bandpass filter. This on-chip High-Q bandpass filter can replace bulky, expensive and off-chip SAW filters. The impedance which is seen by the antenna is tuned by switch resistance of the Passive Mixer and the input impedance of the Trans-impedance amplifier (baseband impedance) to match antenna impedance. The gain of the feedback loop of the TIA controls the input impedance of the TIA. Further, M baseband impedance can be replaced by M/4 complex impedance. This complex impedance provides a wide RF range by changing the transconductance.

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[2]  Ahmad Mirzaei,et al.  Architectural Evolution of Integrated M-Phase High-Q Bandpass Filters , 2012, IEEE Transactions on Circuits and Systems I: Regular Papers.

[3]  Alyosha C. Molnar,et al.  Implications of Passive Mixer Transparency for Impedance Matching and Noise Figure in Passive Mixer-First Receivers , 2010, IEEE Transactions on Circuits and Systems I: Regular Papers.