Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2006-10-17
2006-10-17
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
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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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.
Itakura Tetsuro
Ito Rui
Kurose Daisuke
Callahan Timothy P.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Luu An T.
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