Operational transconductance amplifier programmable filter
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United States of America Patent
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-
Mar 19, 1991
Grant Date -
N/A
app pub date -
Oct 30, 1989
filing date -
Oct 30, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A general biquadratic filter circuit is described which uses operational transconductance amplifiers. A bias current controls the transconductance (gm) of the amplifiers which in turn control the corner frequency (Wo) of the circuit. The circuit is configured with three potential sources which can be preselected to either be at a ground level or at a desired voltage level. By preselecting which of the potentials are grounded and which are at a desired voltage level, the circuit can become either a lowpass, highpass, bandpass or notch filter.
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