Tuning circuit

Details Tuning circuit Tuning circuit

2005-10-11

2005-10-11

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Negative resistance or reactance networks of the active type

Having negative impedance

C333S213000, C330S104000

Reexamination Certificate

active

06954123

ABSTRACT:
Selectivity Q of a tuning circuit is maximized by using a negative resistance circuit that is not influenced significantly by changes in conditions such as temperature, source voltage, etc. The tuning circuit operates stably and is constituted by a series resonance circuit and the negative resistance circuit connected thereto.The negative resistance circuit can be a C-E dividing type circuit including a npn transistor as a first stage circuit and an emitter earth type amplifying circuit including a pnp transistor as a second stage circuit. A collector output of the pnp transistor is connected to an emitter of the npn transistor to constitute a negative feedback circuit and the collector output is divided and connected to a base of the npn transistor to constitute a positive feedback circuit.Selectivity Q is improved by the negative resistance circuit provided by the negative feedback circuit.

REFERENCES:
patent: 6573788 (2003-06-01), Oppelt
patent: 6836199 (2004-12-01), Kawai
patent: 6870447 (2005-03-01), Kawai

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