Filter circuit suitable for being fabricated into integrated cir

Details Filter circuit suitable for being fabricated into integrated cir Filter circuit suitable for being fabricated into integrated cir

1981-10-05

1984-06-26

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330109, 330281, H03F 134, H03G 310

Patent

active

044568851

ABSTRACT:
A time-constant circuit suitable for being fabricated into an integrated circuit comprising a resistive element with its one end connected to a first input terminal, an impedance converting circuit with its input connected to another end of said resistive element and its output connected to an output terminal, a variable gain differential amplifier with its one input connected to the output of said impedance converting circuit and its another input connected to a second input terminal, an adder circuit for adding an output from said amplifier and an input signal appearing on said second input terminal, and a capacitive element connected between the junction of said resistive element and said impedance converting circuit and the output of said adder circuit. A plurality of the time-constant circuits are combined to construct a filter circuit. The gain of the variable gain differential amplifier in each time-constant circuit is controlled by a common DC voltage, whereby the spread of characteristic values of the integrated circuit elements can be compensated.

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