Amplifiers – With periodic switching input-output
Patent
1985-04-30
1986-12-09
LaRoche, Eugene R.
Amplifiers
With periodic switching input-output
330 51, 330253, H03F 114
Patent
active
046282742
ABSTRACT:
The invention concerns an amplifier comprising means for compensating for the input drift voltage. During a preparation phase, the input signal of the amplifier (10) is nullified by short-circuiting the inputs (12) and (13) by means of the change-over switch (30) and the output (15) is connected to a capacitor (40) and to a secondary input (14) of the amplifier. The secondary input has a substantially lower gain than the gain relative to the main input (13), which makes it possible substantially to reduce the effect of charge injection caused by opening of the switch (60). In the amplification phase, the input (13) receives an input signal (V1) and the input drift voltage (.alpha.V) is compensated by means of the value stored in the capacitor (40).
REFERENCES:
patent: 3737798 (1973-06-01), Faraguet et al.
patent: 4306196 (1981-12-01), Dwarakanath et al.
patent: 4431929 (1984-02-01), Vittoz
Jacob Millman, et al, Integrated Electronics: Analog and Digital Circuits and Systems, 1972 (pp. 501-503).
IEEE Journal of Solid State Circuits, vol. SC-13, No. 3, Jun. 1978, "A mV MOS Comparator", pp. 294-297.
IEEE Journal of Solid-State Circuits, vol. SC-13, No. 4, Aug. 1978, pp. 499-503, "A Low Drift Fully Integrated MOSS-FET Operational Amplifier".
F. Krummenacher, "High Voltage Gain CMOS OTA for Micropower SC Filter", Electronics Letters, vol. 17, No. 4, Feb. 19, 1981.
Oguey Henri J.
Vittoz Eric A.
Centre Electronique Horloger S.A.
LaRoche Eugene R.
Mottola Steven J.
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