Filter circuit comprising an amplifier and a capacitor

Details Filter circuit comprising an amplifier and a capacitor Filter circuit comprising an amplifier and a capacitor

1990-06-28

1992-10-13

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328167, 307271, 307556, H03B 100, H03K 500

Patent

active

051553953

ABSTRACT:
A filter circuit includes an amplifier having an amplifier element that receives an input voltage and a capacitor that provides an output voltage determined by the input voltage. The base-emitter path of a first bipolar transistor is incorporated in a first current path between the output electrode of the amplifier element and the capacitor and the base-emitter path of a second bipolar transistor is incorporated in a second current path. The base of the second transistor is connected to the capacitor. The capacitor receives charge and discharge currents each of which are base currents and are thus very small so that the capacitor can have a small capacitance and can thus be incorporated easily into an integrated circuit. The circuit can be used as a coincidence detector and as a peak detector.

REFERENCES:
patent: 4110635 (1978-08-01), Hongu et al.
patent: 4363004 (1982-12-01), Englund, Jr. et al.
patent: 4472689 (1984-09-01), Fukushima et al.
patent: 4518878 (1985-05-01), Moulding
patent: 4535358 (1985-08-01), Duijkers
patent: 4689580 (1987-08-01), Fukuda et al.

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