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. 31, 2002
Filed:
Mar. 06, 2002
Kuok Ling, Calabasas, CA (US);
Teradyne, Inc., Boston, MA (US);
Abstract
A differential D flip-flop is disclosed including respective master and slave cells. The master cell comprises a first data set circuit and a first data store circuit. The data set circuit has a first differential input and a first differential output. The first data store circuit couples to the output of the first data set circuit. The cell further includes a differential clock circuit and a first current source for generating a fixed bias current in the master cell. The clock circuit having complementary clock inputs to alternatingly set and store data in the data set and data store circuits. The slave cell is formed substantially similar to the master cell, and includes a second differential input coupled to the first differential output of the master cell. The slave cell further includes a second current source for generating a second bias current in the slave cell, the second current source having programmable inputs for varying the slave cell bias current, thereby controlling the delay characteristic of the flip-flop.