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:
Feb. 21, 1995
Filed:
Nov. 07, 1991
Mauricio A Zavaleta, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A regulated charge pump (43) includes a charge pump core (114) having a charging capacitor (80). An output voltage on a first terminal (72) of the charging capacitor (80) is transferred to a holding capacitor (81). A second terminal (73) of the charging capacitor (80) is alternatively connected to positive and negative power supply voltage terminals in response to non-overlapping clock signals. The first terminal (72) of the charging capacitor (80) is connected through first (150) and second (151) transistors to the positive power supply voltage terminal. A proportional portion (112) provides a coarse regulation by biasing the first transistor (150) proportional to a comparison between a predetermined fraction of an output voltage and a reference voltage. An integrating portion (113) provides a precise regulation by biasing the second transistor (151) proportional to an integrated difference between the output voltage and a reference voltage.