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:
Dec. 22, 1987
Filed:
Oct. 15, 1986
John L Addis, Beaverton, OR (US);
Tektronix, Inc., Beaverton, OR (US);
Abstract
A precision differential amplifier having unity-gain buffer amplifier input stages on each side of the amplifier includes a primary feedback path between the collector and base of the inside buffer amplifier transistor which operates when the differential amplifier is operated within its linear operating range. Under an overdrive signal condition, the primary feedback path is opened and a secondary feedback is activated to control the collector and base of the inside buffer amplifier transistor, thus preventing saturation of the inside buffer amplifier transistor and cutoff of the outside transistor. The primary and secondary feedback paths consist of only semiconductor junctions, minimizing heat and loading effects, reducing power supply voltage requirements, and facilitating rapid overdrive recovery.