Patent ID: 11949427
Assignee: CIRRUS LOGIC INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 17:
18. A force sensor circuit comprising:
a resistive force sensor;
a bias voltage generator circuitry coupled to the resistive force sensor to supply a bias voltage to the resistive force sensor; and
compensation circuitry for compensating for an offset voltage that is present in a differential output signal output by the force sensor, the compensation circuitry comprising:
voltage divider circuitry, the voltage divider circuitry configured to receive the bias voltage and to output a control voltage derived from the bias voltage, wherein a component mismatch ratio of the voltage divider circuitry is adjustable to correspond to a component mismatch ratio of the force sensor;
current generator circuitry configured to receive the control voltage and to generate a compensating current based on the received control voltage; and
amplifier circuitry configured to receive the signal output by the force sensor and the compensating current and to output a compensated output signal in which the offset voltage is at least partially cancelled.