Cirrus Logic Inc.

Gavin McVeigh

Tejasvi Das

Matthew Beardsworth

Hamid Sepehr

Carl L Ståhl

Michael Allan Kost

Michael Allen Kost

The present disclosure relates to a compensation circuit for compensating for an offset voltage that is present in an output signal output by a force sensor. The compensation circuit comprises: voltage divider circuitry, the voltage divider circuitry configured to receive a bias voltage that is also supplied to the force sensor 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 differential signal output by the force sensor and the compensating current and to output a compensated differential output signal in which the offset voltage is at least partially cancelled.

Force sensing systems

Embodiments described herein relate to methods and apparatuses for controlling an operation of a vibrational output system and/or an operation of an input sensor system, wherein the controller is for use in a device comprising the vibrational output system and the input sensor system. A controller comprises an input configured to receive an indication of activation or de-activation of an output of the vibrational output system; and an adjustment module configured to adjust the operation of the vibrational output system and/or the operation of the input sensor system based on the indication to reduce an interference expected to be caused by the output of the vibrational output system on the input sensory system.

Methods and apparatuses for controlling operation of a vibrational output system and/or operation of an input sensor system

Circuitry for biasing a sensor comprises a bias generator module configured to receive a supply voltage and to generate a bias voltage for biasing the sensor. The circuitry further comprises a control module configured to compare a voltage indicative of the supply voltage to a threshold voltage and to output a control signal to the bias generator module based on the comparison. The bias generator module is configured to control the bias voltage based on the control signal.

Force sensing circuitry

The present disclosure provides digital to analog conversion circuitry comprising: a set of input nodes for receiving a digital input code; an output node for outputting an analog output signal representative of the input code; and a plurality of selectable conversion elements, wherein a parameter of each of the plurality of selectable conversion elements is configured such that a transfer function between the input code and the output analog signal is non-monotonic.

Growing community of inventors

Edinburgh, United Kingdom

Gavin McVeigh