Analog integrated filter circuit

Details Analog integrated filter circuit Analog integrated filter circuit

1980-03-27

1982-07-13

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330288, 330289, 330305, 330306, H03F 134

Patent

active

043397298

ABSTRACT:
An analog integrated filter circuit includes a capacitance multiplier combined with a DC bias controlled current circuit designed to render the filter circuit insensitive to changes in the parameter values of the components caused by process variations or a temperature change therein. The capacitance multiplier circuit includes grounded or ungrounded capacitance multipliers in different combinations operatively coupled to the DC bias controlled current circuit so that the capacitance multiplier circuit can be used to construct a predictable low pass, bandpass or high pass filter circuit with frequency characteristics that do not vary over temperature.

REFERENCES:
patent: 3911296 (1975-10-01), Davis
patent: 3969682 (1976-07-01), Rossum
patent: 4205276 (1980-05-01), Wright et al.

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