Feedback peak detector fitted wireless handwriting tablet
First Claim
Patent Images
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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Abstract
In a feedback peak detector fitted wireless handwriting tablet, the feedback peak detector comprises a feedback comparator buffer unit, a peak detection switch unit, a fast charge path unit, a peak signal holding unit, and a fast discharge unit. The feedback peak detector is designed with a light load capable of stabilizing peak signals and fast charging/discharging a capacitor to ensure the correct calculation of coordinates for keeping handwriting at a normal and stable speed.
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Citations
9 Claims
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1. A feedback peak detector fitted wireless handwriting tablet, wherein the feedback peak detector comprises:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification