Equivalent variable resistor circuits

Details Equivalent variable resistor circuits Equivalent variable resistor circuits

1997-05-21

1998-11-17

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327306, H03L 500

Patent

active

058381848

ABSTRACT:
An equivalent variable resistor circuit for use in an integrated circuit includes a signal path extending from a signal input terminal through a first resistor to a signal output terminal, a first transistor having its collector connected with a signal output portion of the signal path between the first resistor and the signal output terminal, a second transistor having its collector connected with a DC voltage source and its emitter connected with an emitter of the first transistor for forming a differential pair with the first transistor, a third transistor having its collector connected with the emitters of the first and second transistors connected with each other and its emitter connected through a second resistor to a reference potential point to form a voltage to current converting portion with the second resistor, and a voltage controlling portion provided for varying a DC voltage supplied between bases of the first and second transistors, so as to vary equivalently a resistance of the signal path between the signal input terminal and the signal output terminal.

REFERENCES:
patent: 5300834 (1994-04-01), Bret

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