Negative resistance circuit

Details Negative resistance circuit Negative resistance circuit

2006-01-10

2006-01-10

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Negative resistance or reactance networks of the active type

Having negative impedance

C333S213000, C330S06100R, C330S104000

Reexamination Certificate

active

06985053

ABSTRACT:
In order to provide a negative resistance circuit which is not influenced by means of change of temperature and source voltage, etc., operates stably and has simple circuit construction, a first stage circuit of the negative resistance circuit is a collector-emitter dividing type amplifying circuit comprising of a npn transistor and a second stage circuit thereof is an emitter earth type amplifying circuit comprising of a pnp transistor. A collector output of the pnp transistor is connected to a base of the npn transistor to constitute a positive feedback path and is divided and is connected to an emitter of the npn transistor to constitute a negative feedback path. An amplification factor A of the emitter earth type amplifying circuit and voltage dividing ratio β is set to be (1+Aβ)<A.

REFERENCES:
patent: 5424686 (1995-06-01), Wong et al.
patent: 6573788 (2003-06-01), Oppelt
patent: 6788792 (2004-09-01), Maejima et al.

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