Variable time constant circuit and filter circuit using the...

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

Reexamination Certificate

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Details

C327S553000, C327S558000, C330S303000

Reexamination Certificate

active

07123082

ABSTRACT:
A variable time constant circuit includes an inverting amplifier which has an amplifier input terminal and an amplifier output terminal connected to a signal output terminal and inverts a signal inputted to the amplifier input terminal, a first and a second resistor which are connected in series between the signal input terminal and the amplifier input terminal, a capacitor connected between the amplifier input terminal and the amplifier output terminal, a field effect transistor including a gate terminal connected to a junction point of the first and second resistors, a source terminal kept at a constant potential, and a drain terminal connected to the amplifier input terminal, the transistor flowing a current through the drain terminal according to a voltage between the gate terminal and the source terminal, and a control circuit which controls a voltage-current conversion ratio of the transistor according to a time constant control signal.

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patent: 3335872 (2002-08-01), None
Notification of the First Office Action issued by the Chinese Patent Office, dated March 31, 2006, in Chinese Application No. 2003101244467 and English translation of Notification.

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