Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device
Patent
1993-10-07
1995-10-03
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Utilizing three or more electrode solid-state device
327576, H03K 1760
Patent
active
054555337
ABSTRACT:
An impedance converter includes an emitter follower constructed of a first transistor with a first resistor connected between an emitter electrode of the first transistor and an output terminal. Input to the emitter follower is provided by a second transistor of complementary type, with input signal applied to the base of the second transistor and the emitter electrode of the second transistor coupled to the base of the first transistor with a second resistor. Bias current in the second transistor and second resistor is in constant proportion to bias current in the first transistor and first resistor. Output impedance can be made positive, negative or zero by appropriate proportioning of the first and second resistors.
REFERENCES:
patent: 3336511 (1967-08-01), Wajs
patent: 4123723 (1978-10-01), Sugawara
patent: 4371792 (1983-02-01), Dobkin
patent: 4633100 (1986-12-01), van Tuijl
patent: 4771227 (1988-09-01), Nelson
8181 New Electronics 19(1986) Nov., No. 22, London, Great Britain p. 12.
Callahan Timothy P.
Englund Terry L.
Herrmann Eric P.
Telefunken Fernseh und Rundfunk GmbH
Tripoli Joseph S.
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