Microsoft Corporation
BRIDGE SENSOR DC ERROR CANCELLATION SCHEME

Abstract:

The disclosed techniques provide a number of technical benefits by providing a bridge sensor DC error cancellation scheme. In one embodiment, a system includes a piezoresistive Wheatstone bridge, a number of switches, and a non-overlapping clock. The system can mitigate noise and other errors by subtraction of the two differential outputs of the system between a first phase and a second phase of a clock input controlling the switches. In some embodiments, the system can also include differential programmable gain amplifiers and a multi-bit analog-to-digital converter. By providing a bridge sensor DC error cancellation scheme for producing an analog output, a system can be used to generate a stable digital output of at the analog-to-digital converter.