Active filter circuit of a capacity ground type

Details Active filter circuit of a capacity ground type Active filter circuit of a capacity ground type

1992-03-27

1995-12-12

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327558, 327560, 327563, 327310, 327336, H03K 500, G06G 712

Patent

active

054753384

ABSTRACT:
An active filter circuit has differential transistors having first conductivity type bipolar transistors and load transistors having second conductivity type bipolar transistors. A connecting node between the differential transistors and the load transistors is driven by a middle electric potential. Voltage dependent characteristics of earth capacitance including parasitic capacitances parasitic to the differential transistors and the load transistors can be kept constant by offsetting the voltage dependent characteristics of the parasitic capacitances. It is thereby possible to make the active filter circuit small in size and the consumed electric power reduced.

REFERENCES:
patent: 4839542 (1989-06-01), Robinson
patent: 4841179 (1989-06-01), Hagino et al.
patent: 4851718 (1989-07-01), Hagino et al.
patent: 4859881 (1989-08-01), Yamamoto et al.
patent: 4922139 (1990-05-01), Giebel
patent: 4926135 (1990-05-01), Voorman
patent: 5051628 (1991-09-01), Hanna
patent: 5053639 (1991-10-01), Taylor
patent: 5134318 (1992-07-01), Itoh
patent: 5192884 (1993-03-01), Kusano
patent: 5206548 (1993-04-01), Takahashi et al.

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