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. 18, 1986
Filed:
Apr. 29, 1985
Joe W Peterson, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A fully differential gain stage having high gain and common-mode feedback is provided with minimal circuitry. Differential input transistors adapted to receive differential input voltages are coupled to load transistors. During a first time period, the gain stage is placed in unity gain and the load transistors are configured as diodes. Charge storage devices are charged during the first time period with a charge which is proportional to both the current of a current supply and the physical dimensions of the load transistors. During a second time period, the charge storage devices provide a bias voltage to the load transistors which maintains the common-mode output voltage at a predetermined value. During the second time period, the gain stage is configured for high gain operation.