Small current detector circuit and locator device using the same

Details Small current detector circuit and locator device using the same Small current detector circuit and locator device using the same

1997-11-13

2000-06-13

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345174, 178 1801, 178 1806, G09G 500

Patent

active

060755202

ABSTRACT:
The improved small current detector circuit and locator device each include a first and a second capacitor, a pulse drive circuit which drives one terminal of each capacitor by a pulse signal and charges and discharges the capacitors in synchronism with the rise and fall of the applied pulse so as to generate a first and a second detection signal at the other terminal of each capacitor. A current generator circuit receives the first and second detection signals and generates a current representing the difference between the levels of said signals. An integrator circuit integrates the output current from the current generator circuit. At least one of the first capacitor or second capacitor is provided in a detection portion of the detector circuit or locator device.

REFERENCES:
patent: 4600807 (1986-07-01), Kable
patent: 5053757 (1991-10-01), Meadows
patent: 5270711 (1993-12-01), Knapp
patent: 5305017 (1994-04-01), Gerpheide
patent: 5349303 (1994-09-01), Gerpheide
patent: 5386219 (1995-01-01), Greanias et al.
patent: 5565658 (1996-10-01), Gerpheide et al.
patent: 5796389 (1998-08-01), Bertram et al.

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