Impedance transformation circuit with matched current sources

Details Impedance transformation circuit with matched current sources Impedance transformation circuit with matched current sources

1992-09-10

1994-12-13

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

With auxiliary means to condition stimulus/response signals

324713, 323315, 330282, G05F 500

Patent

active

053732430

ABSTRACT:
An impedance transformation circuit for transforming a two-pole electrical impedance (Z) includes a first controllable current source for producing a current (I.sub.1) flowing through the impedance during operation. An operational amplifier is coupled to the first current source for providing a control signal (V.sub.0) corresponding to the impedance current (I.sub.1). A second controllable current source is coupled to the operational amplifier for providing at an input terminal of the circuit a further current (I.sub.2) proportional to the impedance current (I.sub.1) as a function of the control signal (V.sub.0). As a result of using a first and second controllable current source and applying the control signal delivered by the operational amplifier to the control inputs of the two current sources, an impedance transformation is obtained which is dependent on similar parameter ratios. The circuit is suitable for use as an integrated semiconductor circuit.

REFERENCES:
patent: 3828281 (1974-08-01), Chambers, Jr.
patent: 4220875 (1980-09-01), Lawton
patent: 4339729 (1982-07-01), Jason et al.
patent: 4363008 (1982-12-01), Chambers, Jr.
patent: 4517508 (1985-05-01), Sakai
patent: 4591739 (1986-05-01), Nagano

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