Title :
A new technique for the implementation of programmable-Q MOSFET-C filters
Author :
Khachab, Nabil I. ; Ismail, Mohammed
Author_Institution :
Solid-State Lab., Ohio State Univ., Columbus, OH, USA
Abstract :
A new technique for the implementation of programmable-Q MOSFET-C filters is introduced. The technique uses nonlinear circuits in the feedback path of the filter, allowing the tuning of Q through DC control voltages. The resulting topology is fully compatible with MOS technology. In addition, the center frequency ω0 of the filter is also programmable via DC voltage controlled transconductance elements. An interesting connection between programmability, design automation, and physical layout of analog integrated circuits is discussed. The application of this technique to a second-order biquad filter is presented, along with computer simulation results
Keywords :
active filters; insulated gate field effect transistors; DC control voltages; DC voltage controlled transconductance elements; MOS technology; analog integrated circuits; center frequency; design automation; feedback path; layout; nonlinear circuits; programmability; programmable-Q MOSFET-C filters; second-order biquad filter; tuning; Circuit optimization; Circuit topology; Design automation; Filters; Frequency; Integrated circuit technology; MOSFET circuits; Nonlinear circuits; Transconductance; Voltage control;
Conference_Titel :
Circuits and Systems, 1989., Proceedings of the 32nd Midwest Symposium on
Conference_Location :
Champaign, IL
DOI :
10.1109/MWSCAS.1989.101772
