Low pass filter circuit utilizing transistors as inductive eleme

Details Low pass filter circuit utilizing transistors as inductive eleme Low pass filter circuit utilizing transistors as inductive eleme

1997-04-11

1998-05-12

Cunningham, Terry

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327552, H03H 100

Patent

active

057511853

ABSTRACT:
The present invention relates to a filter circuit which is suitable for use in an integrated circuit formed of transistors or field effect transistors, and controls the frequency band of the amplifying circuit used for the signal receiver, for example, within an optical communications system. The filter circuit includes a first transistor (T1) having a base or gate grounded with high-frequency component via a first resistor (R1); and a second resistor (R2) and a capacitor (C1) each having one end connected to the emitter or source of the first transistor (T1) and the other terminal grounded with high-frequency component. The filter circuit acts as a circuit in which the first transistor (T1) inputs the current (Iin) at a juncture at which the second resistor (R2) and the capacitor (C1) are connected therewith and outputs its collector or drain current (Iout).

REFERENCES:
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patent: 4877979 (1989-10-01), Sempel
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patent: 5293087 (1994-03-01), Hamano et al.
J. Choma et al. "Actively Peaked Broadbanded Monolithic Amplifier" IEEE Proc. vol. 127 Pt. G No. 2 Apr. 1980.
J. Choma et al. "A Broadbanded Common Collector Common-Base Differential Quartet" IEEE Journal of Solid State Circuits vol. ed-16, No. 2, Apr. 1981.
J.Choma, Jun "Output Inductance of an Emitter Follower", Electronic Circuits and Systems, vol. 3 No. 4 Jul. 1979.
Simpson, "Two Active Low-Pass Instrumentation Filters", Aug. 1971, p. 45.

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