Circuit and method for reducing voltage error when charging and

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

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Details

327554, 327379, 327391, H03B 100, H03K 1716

Patent

active

055348190

ABSTRACT:
A circuit and method for reducing voltage error when charging and discharging a variable capacitor (44) through a switch (43). The switch (43) comprises a plurality of transmission gates (53-55) coupled in parallel. A control circuit (42) provides control signals for enabling transmission gates of the plurality of transmission gates (53-55). The control circuit (42) changes the resistance of the switch (43) by selecting an appropriate transmission gate wherein each transmission gate has a different resistance. The resistance of the switch (43) is varied as a capacitance of the variable capacitor (44) is changed to maintain a predetermined RC time constant over the entire range of capacitor values of the variable capacitor (44).

REFERENCES:
patent: 4322697 (1982-03-01), Carbrey
patent: 4814640 (1989-03-01), Miyake
patent: 5440260 (1995-08-01), Hayashi et al.
Authors Roubik Gregorian and Gabor C. Temes, "Analog MOS Integrated Circuits for Signal Processing", chapter 7, p. 467 equation 7.10.

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