Variable capacitance emulation circuit for electrophysiology dia

Details Variable capacitance emulation circuit for electrophysiology dia Variable capacitance emulation circuit for electrophysiology dia

1996-08-06

1997-12-09

Getzow, Scott

Surgery

Miscellaneous

323354, A61B 500

Patent

active

056949499

ABSTRACT:
An electrophysiology diagnostic device generating a high voltage (HV) pulse of a predetermined shape, which device is electrically connected to a patient's heart, i.e., a load resistance and which device includes a microprocessor and a load resistance measuring device, includes a variable capacitance emulation (VCE) circuit. The VCE circuit, which is capable of emulating a selected capacitance C, includes a fixed capacitor C.sub.0, and first and second branch circuits including respective resistors R.sub.1 and R.sub.2 and corresponding switching elements, connected in parallel with the load resistance R.sub.L. According to one aspect of the VCE circuit, the selected capacitance C satisfies the expression effective resistance value produced by pulse width modulation control of at least one of the resistors R.sub.1 and R.sub.2 using corresponding switch elements. A method for operating a branch network to emulate a predetermined resistance is also described.

REFERENCES:
patent: 3624530 (1971-11-01), Zwirn

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