Patent ID: 6717574
Filing Date: 2004-04-06
Classification: G06F

Abstract:
A feedback peak detector fitted wireless handwriting tablet, wherein the feedback peak detector comprises:a feedback comparator buffer unit, having one end for input of an analog voltage signal, another end for input of a voltage signal of a feedback capacitor, and one more end for output of a voltage comparison signal; a fast charge path unit for charging fast a potential-following capacitor and stabilizing the Gate of a first MOSFET; a peak detection switch unit, having: a plurality of output ends coupled with the feedback peak detector and the fast charge path unit respectively; an input end coupled to the output end of the feedback comparator buffer unit; a control end for input of a control pulse signal; for control ON/OFF operation of a feedback capacitor's voltage signal and the voltage comparison signal; a fast discharge unit for discharging fast the potential-following capacitor and a peak-holding capacitor; and a peak signal holding unit for filtering possible noise to hold the peak-holding capacitor at a stable voltage, having: a plurality of connecting ends coupled to the peak detection switch unit, the fast discharge unit, and an analog/digital converter (ADC) respectively; an input end connected with the output end of the fast charge path unit, and an output end connected to the ADC.