Circuit for accurately discharging a capacitor

Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device

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Details

327481, 327482, 327530, 327535, 327538, 327578, 323312, H03K 1760, G05F 110, G05F 304

Patent

active

054537126

ABSTRACT:
A subcircuit for discharging a capacitor at a preselected rate incorporates a first transistor and a second transistor connected with the emitter of the first transistor providing current to the collector of the second transistor. The base of the first transistor is connected to a capacitor to be discharged at a preselected rate. The base current of the first transistor discharges the capacitor as a function of the base current provided to the second transistor. In order to provide a current of very small magnitude to the base of the second transistor, a plurality of lateral PNP transistors are connected in a plural stage arrangement in order to take advantage of the current dividing characteristic of lateral PNP transistors. A collector of one lateral PNP transistor is connected to the emitter of another so that each stage of the subcircuit reduces the output current by a very precise ratio.

REFERENCES:
patent: 4339765 (1982-07-01), Nakamura et al.
patent: 4797577 (1989-01-01), Hing
patent: 4992731 (1991-02-01), Lorenzen
patent: 5017816 (1991-05-01), Wilcox

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