Title :
A transistor-only high-pass filter with adjustable Q factor
Author_Institution :
Western Digital Corp., Irvine, CA, USA
fDate :
2/1/1993 12:00:00 AM
Abstract :
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
Keywords :
Q-factor; active filters; equivalent circuits; field effect transistor circuits; frequency response; high-pass filters; transfer functions; adjustable Q factor; control voltage; cutoff frequency; distributed MOSFET; element PMOSFET; frequency response; high-frequency model; high-pass filter; parasitic capacitances; source-follower gain; transfer function; transistor-only filter; Active circuits; Cutoff frequency; Filtering theory; Frequency response; Low pass filters; MOS capacitors; MOSFET circuits; Q factor; Resistors; Voltage control;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
