Circuit and oscillating apparatus

Details Circuit and oscillating apparatus Circuit and oscillating apparatus

2007-10-19

2010-02-02

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

C327S115000, C327S117000

Reexamination Certificate

active

07656234

ABSTRACT:
A circuit includes a logic circuit containing a first transistor and a second transistor which are connected in series to each other between a high power supply and a low power supply in such a manner that an emitter of one of the first and second transistors is connected to a collector of the other of the first and second transistors. The first transistor is positioned closer to the high power supply, and the second transistor is positioned closer to the low power supply. The logic circuit operates in accordance with voltages input into bases of the first and second transistors. The circuit further includes a current amplifying circuit containing a third transistor whose collector is connected to one of the high and low power supplies, whose emitter is connected to the other of the high and low power supplies, and whose base is connected to an output from the logic circuit. The current amplifying circuit amplifies a current of a logic signal from the logic circuit and feeds, from the emitter of the third transistor, the current-amplified logic signal back to the base of the second transistor.

REFERENCES:
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patent: 2003/0141912 (2003-07-01), Sudjian
patent: 2005/0116258 (2005-06-01), Yamagishi et al.
patent: 2006/0135108 (2006-06-01), De Ranter et al.
patent: S62-236211 (1987-10-01), None
patent: 2001-136059 (2001-05-01), None
patent: 2003-188716 (2003-07-01), None

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