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:
Feb. 12, 1991
Filed:
Aug. 11, 1989
Katsuhiro Ishimura, Tokyo, JP;
Shusei Aoki, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
In a variable high-voltage generating circuit for an avalanche photodiode, a pulse oscillating circuit generates pulses, a current driving circuit current-amplifies the pulses, a Cockcroft-Walton circuit boosts and rectifies the pulses from the current driving circuit, and a low-pass filter is connected at the output of the Cockcroft-Walton circuit. The avalanche photodiode is connected in series with a first resistor, and the series connection is connected to receive the output of the low-pass filter. A series connection of a transistor and a second resistor is connected in parallel with the series connection of the avalanche diode and the first resistor. A control circuit applies a variable signal to the base of the transistor, thereby to vary the voltage applied across the APD.