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. 22, 1994
Filed:
May. 25, 1993
Joseph Nodar, Dallas, TX (US);
Todd M Neale, Carrollton, TX (US);
Douglas R Johnson, Cedar Rapids, IA (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An integrated circuit device (10) has an operational amplifier (12) and a charge pump (14) for creating a negative voltage level -Vcc. The operational amplifier (12) preferably has various sub-components. In particular, a bias generator (36) is included and connected to a neutral voltage level (31) isolated from the negative voltage level and providing current for operational amplifier (12). An input stage (38) has inputs (16 and 18) for receiving two input signals and maintains the input signals in a balanced signal path. A conversion circuitry (40) receives the input signals and creates a single differential signal eliminating noise received in the input stage (38). An output stage prepares this single differential signal for transfer out of the operational amplifier (12).