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:
Mar. 10, 1998
Filed:
Nov. 12, 1996
Jerry T Bolton, Jr, Plantation, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A reference voltage generator (100) generates a constant offset reference voltage (125) relative to a reference ground voltage (115) that tracks supply voltage (105). The supply voltage (105) is scaled to derive the reference ground voltage (115). A scaled voltage output (135) is derived from a temperature and supply independent voltage source, such as a bandgap voltage generator. The scaled voltage output (135) is summed with the reference ground voltage (115) to generate the constant offset reference voltage (125). The summing function is preferably performed by an operational amplifier (220) having an input (221) coupled to the scaled voltage output by a MOSFET transistor (242), and another input (222) coupled to the reference ground voltage (115).