High output impedance current source

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

Reexamination Certificate

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Details

C327S103000

Reexamination Certificate

active

07116157

ABSTRACT:
A circuit for applications such as electrical impedance tomography includes a voltage-to-current converter having an input for receiving a voltage waveform and an output for outputting a current waveform to a load at an output resistance for the voltage-to-current converter. The voltage-to-current converter includes resistance control means for adjusting the output resistance of the voltage-to-current converter under computer control. The circuit of the present invention also includes an inductance control circuit operatively connected to the voltage-to-current converter for synthesizing a selected inductance. The inductance control circuit includes inductance control means for adjusting the value of the selected inductance by computer control. The operative connection between the voltage-to-current converter and the inductance control circuit causes application of the selected inductance to the output of the voltage-to-current converter so that an overall output impedance of the current source at the load is both high and controllable.

REFERENCES:
patent: 4427935 (1984-01-01), Bowden
patent: 4451779 (1984-05-01), Griep
patent: 5319345 (1994-06-01), Abe et al.
patent: 63182719 (1988-07-01), None

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