Differential-mode charge transfer amplifier
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United States of America Patent
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Jun 19, 2001
Grant Date -
N/A
app pub date -
Nov 30, 1999
filing date -
Nov 30, 1999
priority date (Note) -
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Abstract
A differential-mode charge transfer amplifier receives a differential input voltage and produces a proportional differential output voltage. The amplifier includes two CMOS charge transfer amplifiers. The two CMOS charge transfer amplifier share two charge transfer capacitors such that the CMOS charge transfer amplifiers are mirrored about the capacitors. The positive charge transfer capacitor terminal (i.e., the terminal that is precharged to a high voltage) of one CMOS charge transfer amplifier is capacitively coupled to the negative charge transfer capacitor terminal (i.e., the terminal that is precharged to a low voltage) of the other CMOS charge transfer amplifier. In addition, the negative charge transfer capacitor terminal of one CMOS charge transfer amplifier is capacitively coupled to the positive terminal of the other CMOS charge transfer amplifier. The amplifier has a significantly increased common-mode rejection, significantly reduced voltage amplification error, and an increased linearity range.
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