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:
May. 07, 2002
Filed:
Nov. 13, 2000
William Redman-White, Romsey, GB;
U.S. Philips Corporation, New York, NY (US);
Abstract
A class AB amplifier having an output stage comprising complementary common source transistors (T , T ) has means for setting the quiescent current. These comprise a bias resistor (R ) through which a bias current is passed and which is connected between the gates of transistors (T and T ) to set their voltages. The current through the bias resistor (R ) is derived from two reference transistors (T and T ) which each have the desired quiescent current passed through them by current sources ( ). The gate voltages of the reference transistors (T , T ) are applied across a reference resistor (R ) and the current through the reference resistor (R ) is mirrored (T to T ) to the bias resistor (R ).