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A transistor-only high-pass filter with adjustable Q factor

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1 Author(s)
Li, W. ; Western Digital Corp., Irvine, CA, USA

A new four-transistor high-pass filter with adjustable Q factor is proposed. The transfer function is examined by using a high-frequency model of a MOSFET. The Q factor depends on the gain of the source-follower, and the intrinsic and parasitic capacitances of the distributed MOSFET and element PMOSFET. The cutoff frequency and the Q factor can be separately tuned by the control voltage. The new high-pass filter has the sharpest frequency response of all existing transistor-only high-pass filters

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Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on  (Volume:40 ,  Issue: 2 )