Abstract: An electronic device may have a display with touch sensors. One or more shielding layers may be interposed between the display and the touch sensors. The shielding layers may include shielding structures such as a conductive mesh structure and/or a transparent conductive film. The shielding structures may be actively driven or passively biased. In the active driving scheme, one or more inverting circuits may receive a noise signal from a cathode layer in the display and/or from the shielding structures, invert the received noise signal, and drive the inverted noise signal back onto the shielding structures to prevent any noise from the display from negatively impacting the performance of the touch sensors. In the passive biasing scheme, the shielding structures may be biased to a power supply voltage.

Abstract: An electronic device may have a display with touch sensors. One or more shielding layers may be interposed between the display and the touch sensors. The shielding layers may include shielding structures such as a conductive mesh structure and/or a transparent conductive film. The shielding structures may be actively driven or passively biased. In the active driving scheme, one or more inverting circuits may receive a noise signal from a cathode layer in the display and/or from the shielding structures, invert the received noise signal, and drive the inverted noise signal back onto the shielding structures to prevent any noise from the display from negatively impacting the performance of the touch sensors. In the passive biasing scheme, the shielding structures may be biased to a power supply voltage.

Abstract: A digital to analog converter samples a first digital signal to produce first digital values and that outputs a first analog signal corresponding to the first digital values to a system. A mixer mixes a second analog signal output by the system in response to the first analog signal with a periodic signal to produce a mixed signal. An integrator integrates the mixed signal and generates an integrator signal based on the integration. An analog to digital converter converts samples of the integrator signal into second digital values. A correction module generates third digital values based on the first digital values and corrections for the integrator and the DAC. A correction determination module determines coefficients based on pairs of ones of the third digital values and ones of the second digital values. A pre-distortion module pre-distorts a second digital signal based on the coefficients to produce the first digital signal.