Front-end signal compensation

Details Front-end signal compensation Front-end signal compensation

2007-01-03

2011-11-01

Wang, Quan-Zhen (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C345S178000, C345S179000, C178S018010, C178S018060, C178S019030

Reexamination Certificate

active

08049732

ABSTRACT:
A touch surface device having improved sensitivity and dynamic range is disclosed. In one embodiment, the touch surface device includes a touch-sensitive panel having at least one sense node for providing an output signal indicative of a touch or no-touch condition on the panel; a compensation circuit, coupled to the at least one sense node, for generating a compensation signal that when summed with the output signal removes an undesired portion of the output signal so as to generated a compensated output signal; and an amplifier having an inverting input coupled to the output of the compensation circuit and a non-inverting input coupled to a known reference voltage.

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