Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1995-04-13
1996-07-09
Nelms, David C.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
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.
Anderson David
Anderson Howard C.
Bersch Danny A.
Garrity Doug
Gunter Brad D.
Hoshizaki Gary W.
Motorola Inc.
Nelms David C.
Phan Trong
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