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:
Nov. 30, 2004
Filed:
Mar. 31, 2003
Runhua Sun, Tustin, CA (US);
Applied Micro Circuits Corporation, San Diego, CA (US);
Abstract
A charge-pump and a method are provided for conditioning the phase detector output in a phase-locked loop (PLL). The method comprises: accepting a pair of differential phase detector (PD) output signals (up/upb and dn/dnb); connecting each pair of differential PD outputs to first and second charge-pump differential sections; supplying differential charge-pump outputs (Vout+/Vout−) in response to the pair of differential PD output signals; and, disconnecting the charge-pump differential section outputs from the loop filter inputs when the PD differential outputs (up/dn and upb/dnb) are equal. In some aspects, supplying differential charge-pump outputs (Vout+/Vout−) in response to the pair of differential PD output signals includes sourcing a first current through the first charge-pump differential section and sourcing a second current through the second charge-pump differential section. Then, the method further comprises maintaining the first current equal to the second current.