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Feedback peak detector fitted wireless handwriting tablet

  • US 6,717,574 B2
  • Filed: 06/19/2001
  • Issued: 04/06/2004
  • Est. Priority Date: 06/19/2001
  • Status: Active Grant
First Claim
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1. 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.

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