Patent ID: 9151774
Filing Date: 2015-10-06
Classification: G01D,G01L,G01P,Y10T

Abstract:
1. A differential capacitive transducer system comprising: a first capacitive core configured to generate a first core output signal based on a physical input; a second capacitive core configured to generate a second core output signal based on the physical input; a first feed-forward path having a high gain circuit element configured to (i) receive the first and second core output signals, and (ii) generate an amplified transducer signal based on the first and second core output signals; a second feed-forward path extending from the first feed-forward path, the second feed-forward path having a first summing amplifier configured to generate a first summation signal based on the amplified transducer signal and a non-inverted reference voltage; a third feed-forward path extending from the first feed-forward path, the third feed-forward path having a second summing amplifier configured to generate a second summation signal based on the amplified transducer signal and an inverted reference voltage, the inverted reference voltage having substantially the same magnitude and opposite polarity as the non-inverted reference voltage; a first feedback path extending from the second feed-forward path, the first feedback path being configured to feed back the first summation signal to each of the first and second capacitive cores; a second feedback path extending from the third feed-forward path, the first feedback path being configured to feed back the second summation signal to each of the first and second capacitive cores; and output circuitry configured to sum the second and third feed-forward paths and generate a transducer output signal based on the first and second summation signals.