Suppression of spurious products in an electrostatic RF MEMS downconverter having differential drive and sense

Conventionally, a downconverter mixes and then filters out all except the required band. Using electrostatics for mixing signals produces unwanted frequency components due to the quadratic relationship. Consequently, this would require a high selectivity bandpass filter which would in turn impose a...

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Bibliographic Details
Main Authors: Scerri, Jeremy, Grech, Ivan, Gatt, Edward, Casha, Owen
Format: Conference Proceeding
Language:English
Subjects:
Band-pass filters
Bandwidth
Conferences
demodulation
downconverter
Downconverters
Electronics
Electrostatics
intermediate frequency
mixer
Mixers
Q factors
Resonant frequency
Simulation
Torque
Tradeoffs
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Summary:Conventionally, a downconverter mixes and then filters out all except the required band. Using electrostatics for mixing signals produces unwanted frequency components due to the quadratic relationship. Consequently, this would require a high selectivity bandpass filter which would in turn impose a constraint on the bandwidth. In this paper, it is shown that by using a differential drive for an electrostatically actuated mixer, the unwanted frequency components are eliminated and the bandwidth-selectivity trade-off is relaxed. Simulation results show that with a Q factor as low as 11, the unwanted frequency content is cancelled and at the same time a bandwidth of 35 kHz is retained.
ISSN:2158-8481
DOI:10.1109/MELCON.2016.7495448