The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 1979
Filed:
Aug. 22, 1978
Katsuaki Takagi, Kokubunji, JP;
Toshiro Tsukada, Kokubunji, JP;
Hisashi Tsuruoka, Hachioji, JP;
Michio Hara, Kodaira, JP;
Hitachi, Ltd., , JP;
Abstract
An analog-to-digital converter comprising a capacitor for storing an analog input signal, a constant current discharging circuit coupled with the capacitor for discharging the charge stored therein, a level detection circuit connected to the input terminal of the capacitor, a counter connected to the output terminal of the level detection circuit for counting the number of clock-pulses between the time of discharge start and the time when the voltage at the input terminal of the capacitor drops to a detection level of the level detection circuit, a bias voltage supply means connected in series with the capacitor for adding a bias voltage to the voltage at the input terminal of said capacitor, and a switch connected in parallel with the capacitor for short-circuiting the capacitor when the voltage at the input terminal of said capacitor drops to the detection level.