Multi-touch sensor and electrostatic pen digitizing system utilizing simultaneous functions for improved performance

Driver and receiver circuitry for a sensor, the circuitry comprising:

• multiple drive/receive circuits, a drive/receive circuit of the multiple drive/receive circuits includes:
• a voltage-following sigma-delta analog to digital converter (ADC) circuit that includes a first input coupled to receive a sensor drive signal, a second input coupled to an electrode of the sensor, and an output;
• and
• a sigma-delta digital to analog converter (DAC) circuit includes a converter input and a converter output, the converter input coupled to the output of the voltage-following sigma-delta ADC circuit;
• and
• an output filter having a filter input coupled to the converter output and a filter output coupled to the second input of the voltage-following sigma-delta ADC circuit and to the electrode of the sensor;
• drive signal generation circuitry coupled to generate the sensor drive signal that includes at least one of a mutual analog sensor signal at a first frequency and a self analog sensor signal at a second frequency that is different from the first frequency;
• and
• wherein the drive/receive circuit is configured to drive and sense the electrode in accordance with at least one of the self analog sensor signal and the mutual analog sensor signal.