METHOD AND APPARATUS FOR SENSING AN INPUT OBJECT RELATIVE TO A SENSING REGION OF AN ULTRASOUND SENSOR DEVICE

摘要

A subsystem, system and method for sensing an input object relative to a sensing region of an ultrasound sensor device are disclosed herein. In one embodiment, a subsystem for sensing an input object relative to a sensing region of an ultrasound sensor device includes a circuit, a switch coupled to an output of the circuit, and an integrating capacitor coupled to the output of the circuit. The circuit has an input for receiving a resulting signal comprising positive and negative polarities, the resulting signal having effects indicative of the input object relative to the sensing region. The integrating capacitor is also coupled to a substantially constant voltage source and to the switch. The circuit is operable to output a rectified signal to the first integrating capacitor indicative of the input object relative to a sensing region.

主权项

1. A subsystem for sensing an input object relative to a sensing region of a sensor device, the subsystem comprising:
a first circuit comprising:
an input for receiving a first resulting signal, wherein the first resulting signal is in a form of a waveform comprising positive and negative polarities, the first resulting signal comprising effects indicative of the input object relative to the sensing region;a first transistor network;a second transistor network; andan output; a first switch coupled to the output of the first circuit; and a first integrating capacitor coupled to the output of the first circuit, to a substantially constant voltage source and to the first switch, wherein the second transistor network and the first transistor network provide a first portion of a first rectified signal to the first integrating capacitor based on the positive polarities of the resulting signal.