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Active Voltage Clamp or Power Supply Regulator

IP.com Disclosure Number: IPCOM000079273D
Original Publication Date: 1973-Jun-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Arnold, RW: AUTHOR [+2]

Abstract

The present circuit is an active voltage clamp wherein capacitive loads, both known and unknown, can be voltage clamped with extreme DC accuracy without the sacrifice of dynamics.

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Active Voltage Clamp or Power Supply Regulator

The present circuit is an active voltage clamp wherein capacitive loads, both known and unknown, can be voltage clamped with extreme DC accuracy without the sacrifice of dynamics.

If V out is above V ref, as driven by a positive current source, the voltage across D1 back biases thus taking the active clamp out of the circuit. If current is drawn out of C, a negative current source, capacitor C discharges. As V out approaches V ref, diode D1 forward biases and prevents V out from going below V ref, thus providing an active clamp to the voltage V out. The stability of the clamp is obtained by the 1K feedback resistor and the 0.0016 uf capacitor. This makes 6H = 1 at 100 Kc. At this time, the impedance of the clamp approx. = 20 ohms and the 0.1 uf capacitor rolls the loop off from then on. The traditional approach would be to roll-off the OA amplifier sooner. This proves to be ineffective, since its slewing rate would be degraded by a factor of 100.

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