Integration circuit including a differential amplifier having a

Details Integration circuit including a differential amplifier having a Integration circuit including a differential amplifier having a

1993-05-04

1995-01-24

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

By integrating

330300, 330253, H03F 345

Patent

active

053845013

ABSTRACT:
An integration circuit includes a differential amplifier constituted by at least two bipolar transistors serving as amplifying elements, a capacitor connected, as a load, across the collection electrodes of the differential amplifier, and a field-effect transistor having source and drain electrodes connected between the emitter electrodes of the two bipolar transistors. A control voltage is applied to the gate electrode of the field-effect transistor. By changing the resistance value between the source and drain electrodes of the field-effect transistor using a gate voltage, the transconductance of the differential amplifier is changed over a wide range. As a result, the time constant of the integration circuit is changed, such that if the integration circuit is used for an active filter, for example, the cut-off frequency can be changed by changing the time constant of the integration circuit.

REFERENCES:
patent: 4181865 (1980-01-01), Kohyama
patent: 4833422 (1989-05-01), Atwell
patent: 4874966 (1989-10-01), Gehrt et al.
patent: 5081423 (1992-01-01), Koyama et al.
patent: 5170133 (1992-12-01), Pernici
patent: 5274225 (1993-12-01), Colles

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