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. 08, 1994
Filed:
Jun. 02, 1993
Jose Alvarez, Leander, TX (US);
Hector Sanchez, Austin, TX (US);
Gianfranco Gerosa, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A charge pump has a reference circuitry (18, 20, 22), a first parallel current path (16), at least one second parallel current path (16), a mirror circuit (46), a sourcing circuitry (60, 62) and a sinking circuitry (50, 54, 66, 68). The first and the at least one second parallel current path sink current from a first node responsive to a predetermined voltage generated by the reference circuitry. The at least one second current path also operates responsive to a control signal. The mirror circuit generates a second predetermined voltage responsive to the total current sunk from the first node. The sourcing circuitry and the sinking circuitry sourcing and sinking a current from the output node, respectively, responsive to the second predetermined voltage and to a control signal. The disclosed charge pump may be incorporated into a phase locked loop circuit where constant stability parameters are desired.