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. 12, 1995
Filed:
Aug. 15, 1994
Edward C Bee, San Jose, CA (US);
Elantec, Inc., Milpitas, CA (US);
Abstract
A class AB complementary output stage provides maximum output voltage swings and high load currents with minimum power dissipation. The output stage includes a first bias circuit that generates a pair of voltage nodes with a resistor controlled bias current. A second bias circuit comprises four current sources the outputs of which are coupled pair-wise across a resistor to form a pair of high impedance nodes at the resistor terminals. The voltage nodes of the first bias circuit establish bias currents in a differential input stage and in a pair of current sources of the second bias circuit. The outputs of the differential input stage drive the inputs of second pair of current sources in the second bias circuit, which provide drive current to the high impedance nodes. The output circuit comprises a pair of complementary common source transistors, the gates (bases) of which are driven by the high impedance nodes of the second bias circuit.