Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1994-02-15
1995-12-05
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327554, 327 94, 327172, H03B 100
Patent
active
054732786
ABSTRACT:
A RC filter circuit is disclosed which includes a first time constant circuit composed of a first resistor and a first capacitor, a switch circuit transferring, when conductive, an input signal to the first time constant circuit, and a pulse generator generating and supplying a pulse signal to the switch circuit to control conductive and non-conductive states of the switch circuit. The pulse generator includes a second time constant circuit composed of a second resistor and a second capacitor and responding a clock signal to generate the pulse signal which has a cycle period dependent on the clock signal and a pulse width dependent on a time constant of the second time constant circuit.
REFERENCES:
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patent: 4551683 (1985-11-01), Matsuo et al.
patent: 4691171 (1987-09-01), Van Roermund et al.
patent: 4791379 (1988-12-01), Hughes
patent: 4888502 (1989-12-01), Jarrett
patent: 5245646 (1993-09-01), Jackson et al.
patent: 5345119 (1994-09-01), Khoury
Callahan Timothy P.
NEC Corporation
Wells Kenneth B.
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