Amplifiers – With periodic switching input-output
Reexamination Certificate
2007-02-09
2008-11-25
Nguyen, Khanh V (Department: 2817)
Amplifiers
With periodic switching input-output
Reexamination Certificate
active
07456684
ABSTRACT:
Low-noise, high-dynamic-range readout circuits with reduced power dissipation for capacitive sensors having small sensing capacitance and low transducer sensitivity are provided by combining a mixed modulation clock and a dual-chopper amplifier (DCA) circuit. The mixed modulation clock is generated by an exclusive-OR (XOR) of a high frequency clock and a low frequency clock. With the mixed modulation clock, an input signal is double-modulated by the high frequency clock and the low frequency clock, respectively. The DCA amplifies the input signal in two amplification stages. The first amplification stage amplifies the double-modulated signal and then demodulates the amplified signal by the high-frequency clock. Then, the second amplification stage amplifies the signal as a conventional chopper amplifier with the low-frequency clock as the chopping clock. Low pass filters following the two amplification stages filter out the modulated circuit offset and low-frequency flicker noise.
REFERENCES:
patent: 6621334 (2003-09-01), Ausserlechner et al.
patent: 6788136 (2004-09-01), McGrath
patent: 7295061 (2007-11-01), Dasgupta
Fang Deyou
Xie Huikai
MH2 Technology Law Group LLP
Nguyen Khanh V
University of Florida Research Foundation Inc.
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