Adjustable active filter

Details Adjustable active filter Adjustable active filter

1984-10-01

1986-06-17

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330305, 330306, H03F 3191

Patent

active

045958858

ABSTRACT:
An adjustable active filter includes a transconductance amplifier (60) and a current source (40, 42) which may be adjusted in value. The resonant frequency of the active filter may be adjusted upwards by increasing the bias current of the transconductance amplifier using a frequency trim up network (48). The resonant frequency may be adjusted downward by decreasing the bias current using a frequency trim down network (44). The trim is preferably accomplished by shorting out zener diodes (120, 122, 124, 126, 150, 152) which control the bias current of the transconductance amplifier.

REFERENCES:
patent: 3480835 (1969-11-01), Richman
patent: 4207538 (1980-06-01), Goel
patent: 4238738 (1980-12-01), Komori
patent: 4260956 (1981-04-01), Harford
patent: 4267519 (1981-05-01), Schade, Jr.
patent: 4340868 (1982-07-01), Pace
patent: 4424461 (1984-01-01), Taguchi et al.
patent: 4438411 (1984-03-01), Rubin et al.
patent: 4513254 (1985-04-01), Harr

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