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:
Apr. 17, 2001
Filed:
Oct. 15, 1998
Donald S. Bethune, San Jose, CA (US);
Ralph G. Devoe, Palo Alto, CA (US);
Christian Kurtsiefer, San Jose, CA (US);
Charles T. Rettner, San Jose, CA (US);
William P. Risk, Sunnyvale, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An avalanche-type detector circuit includes an avalanche-type photon detector device, a coupling capacitor, a bias network, a first transmission line and a second transmission line. The coupling capacitor has a first terminal that is coupled to a first terminal of the avalanche-type photon detector device. A first terminal of the bias network is coupled to the first terminal of the avalanche-type photon detector device, while a second terminal of the bias network is coupled to a bias voltage so that the avalanche-type photon detector device is reverse biased. A first end of the first transmission line is coupled to a second terminal of the coupling capacitor, and second end of the first transmission line is terminated by an open-circuit termination. A first end of the second transmission line is coupled to a second terminal of the avalanche-type photon detector device. The second end of the second transmission line is terminated by a short-circuit termination. A bias pulse voltage V,is coupled to the second terminal of the coupling capacitor such that the bias pulse voltage reverse biases the avalanche-type photon detector device to be greater than a reverse breakdown voltage V,of the avalanche-type photon detector device during a duration of the bias pulse voltage V,. A round-trip propagation delay along the first transmission line is substantially equal to a round-trip propagation delay along the second transmission line.