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:
Jun. 28, 2005
Filed:
Mar. 11, 2003
Wei LI, San Diego, CA (US);
Thomas Clark Bryan, San Diego, CA (US);
Zhixiang Jason Liu, San Diego, CA (US);
Wei Li, San Diego, CA (US);
Thomas Clark Bryan, San Diego, CA (US);
Zhixiang Jason Liu, San Diego, CA (US);
Applied Micro Circuits Corporation, San Diego, CA (US);
Abstract
A ring oscillator stage includes two differential transistor pairs configured to add an adjustable amount of delay to a differential input signal. Each differential pair is biased with a bias current transistor; the bias current transistor is 'protected' by a voltage-clamping transistor that limits the drain voltage of the bias current transistor. The voltage-clamping transistors enable use of a power supply voltage (V) that would otherwise exceed the reliability breakdown voltage limit of the bias current transistors.