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:
Oct. 13, 2009
Filed:
Sep. 25, 2007
Kang-wei Lai, Milpitas, CA (US);
Ninh D. Ngo, Palo Alto, CA (US);
Kazi Asaduzzaman, Fremont, CA (US);
Mian Z. Smith, Los Altos, CA (US);
Wanli Chang, Saratoga, CA (US);
Tim Tri Hoang, San Jose, CA (US);
Kang-Wei Lai, Milpitas, CA (US);
Ninh D. Ngo, Palo Alto, CA (US);
Kazi Asaduzzaman, Fremont, CA (US);
Mian Z. Smith, Los Altos, CA (US);
Wanli Chang, Saratoga, CA (US);
Tim Tri Hoang, San Jose, CA (US);
Altera Corporation, San Jose, CA (US);
Abstract
A feedback loop, such as a phase-locked loop, on an integrated circuit has a detector, a charge pump, and a loop filter. The charge pump adjusts its output current in response to variations in a process of the integrated circuit to reduce variations in the loop bandwidth. The charge pump also adjusts its output current in response to variations in a resistance of a resistor in the loop filter to reduce variations in the loop bandwidth. The charge pump can also adjust its output current in response to variations in a temperature of the integrated circuit to reduce variations in the loop bandwidth. A delay-locked loop on an integrated circuit has a phase detector and a charge pump. The charge pump adjusts its output current in response to variations in the temperature and the process of the integrated circuit to reduce changes in the loop bandwidth.