Amplifiers – With semiconductor amplifying device – Including signal feedback means
Patent
1989-10-30
1991-03-19
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including signal feedback means
330107, 330306, H03F 132
Patent
active
050014412
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.
REFERENCES:
patent: 4839542 (1989-06-01), Robinson
Allied-Signal Inc.
Holden Jerry J.
Mullins James B.
Smith Robert C.
Walsh Robert A.
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