Attenuating voltage follower circuit

Details Attenuating voltage follower circuit Attenuating voltage follower circuit

1993-03-05

1994-02-15

Skudy, R.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323315, 3072961, 3072966, G05F 316

Patent

active

052870545

ABSTRACT:
An attentuating voltage-follower circuit has an input stage that buffers an input voltage signal, which varies about a reference voltage, to form an intermediate voltage signal without a DC level shift. A reference stage sets a pivot voltage which is equivalent to the reference voltage so that an attentuated voltage signal can be generated in response to the difference in voltage between the intermediate voltage signal and the pivot voltage across a simple voltage divider stage. The voltage difference between the intermediate voltage signal and the pivot voltage generates a divider current which flows through the voltage divider stage. The divider current, if uncorrected for, would shift the DC level of the intermediate voltage signal. A correction stage senses the magnitude and direction of the divider current and both sources a compensation current and sinks a buffer current which offsets the divider current, thereby eliminating the DC level shift produced by the divider current.

REFERENCES:
patent: 4288707 (1981-09-01), Katakura
patent: 4553083 (1985-11-01), Yang
patent: 4942369 (1990-07-01), Nakagawara et al.
patent: 4954769 (1990-09-01), Kalthoff
patent: 5140181 (1992-08-01), Yoshiro
patent: 5223743 (1993-06-01), Nakagawara

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