Force sensing systems

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, the compensation circuitry comprising:
• first voltage divider circuitry comprising a plurality of resistances, the first voltage divider circuitry configured to receive the bias voltage that is also supplied to the force sensor and to output a first control voltage derived from the bias voltage, wherein a ratio of resistances of the first voltage divider circuitry is adjustable to correspond to a ratio of resistances of a first voltage divider of the force sensor;
• second voltage divider circuitry comprising a plurality of resistances, the second voltage divider circuitry configured to receive the bias voltage that is also supplied to the force sensor and to output a second control voltage derived from the bias voltage, wherein a ratio of resistances of the second voltage divider circuitry is adjustable to correspond to a ratio of resistances of a second voltage divider of the force sensor;
• first current generator circuitry configured to receive the first control voltage and to generate a first compensating current based on the received control voltage;
• second current generator circuitry configured to receive the second control voltage and to generate a second compensating current based on the received control voltage;
• and
• amplifier circuitry configured to receive the first and second signals output by the force sensor and the first and second compensating currents and to output first and second compensated output signals in which an offset voltage is at least partially cancelled.