Paper No P40: A Reconfigurable Switched‐Capacitor Resistor for Proximity Touch Sensor Readout Circuits

Abstract

This work describes a reconfigurable parasitic insensitive switched-capacitor resistor for proximity touch sensor readout circuits. In this scheme, the conventional programmable resistor bank array is replaced with a switched-capacitor resistor where the resistance is reconfigured by varying the control clock frequency. Furthermore, the control clock is generated by a simple current source and capacitor based time-mode oscillator that reduces the area of the readout circuitry. The proposed touch sensor readout circuit is implemented using CMOS 0.35 mm technology with supply voltage of 3.3 V.