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High temperature charge amplifier for geothermal applications

United States Patent

December 8, 2015
View the Complete Patent at the US Patent & Trademark Office
An amplifier circuit in a multi-chip module includes a charge to voltage converter circuit, a voltage amplifier a low pass filter and a voltage to current converter. The charge to voltage converter receives a signal representing an electrical charge and generates a voltage signal proportional to the input signal. The voltage amplifier receives the voltage signal from the charge to voltage converter, then amplifies the voltage signal by the gain factor to output an amplified voltage signal. The lowpass filter passes low frequency components of the amplified voltage signal and attenuates frequency components greater than a cutoff frequency. The voltage to current converter receives the output signal of the lowpass filter and converts the output signal to a current output signal; wherein an amplifier circuit output is selectable between the output signal of the lowpass filter and the current output signal.
Lindblom; Scott C. (Sandia Park, NM), Maldonado; Frank J. (Albuquerque, NM), Henfling; Joseph A. (Bosque Farms, NM)
Sandia Corporation (Albuquerque, NM)
14/ 023,209
September 10, 2013
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was developed under Contract DE-AC94AL-85000 between Sandia Corporation and the U.S. Department of Energy. The U.S. Government has certain rights in this invention.