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. 11, 2006
Filed:
Mar. 30, 2004
Richard V. Booth, Riegelsville, PA (US);
Richard V. Booth, Riegelsville, PA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
An integrated circuit including at least one loop filter for use in a phase-locked loop, the loop filter including a resistive element and at least one metal-oxide-semiconductor (MOS) transistor configured as a capacitor having a first capacitance associated therewith. The MOS transistor is connected between a voltage source and an input of the loop filter via the resistive element. The loop filter further includes a bias circuit connected to the MOS transistor. The bias circuit is configured for maintaining a substantially constant reference voltage across the MOS transistor, the reference voltage being selected so as to bias the MOS transistor in a designated region of operation. In this manner, the first capacitance is substantially optimized per unit area.