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. 02, 1995
Filed:
Mar. 18, 1994
Joachim Brilka, Hamburg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
In order to minimize signal influences on the reference potential in a rail-to-rail amplifier arrangement this arrangement comprises a first differential amplifier which comprises a first and a second transistor whose emitters are coupled to a reference potential via a common first resistor, the collector of the first transistor forming the output node of the amplifier arrangement, a second differential amplifier to whose input side the input signal of the amplifier arrangement is applied, whose output side is coupled to the base of the first transistor of the first differential amplifier, and having an inverting input coupled to the output node of the amplifier arrangement, a first current mirror circuit having an input transistor to which a reference current is applied, having an output transistor which is formed by the second transistor of the first differential amplifier, and having the emitter side of both transistors coupled to a reference potential, and a second current mirror circuit to whose input side the output signal of the first current mirror circuit is applied and whose output side is coupled to the output node of the amplifier arrangement, which second current mirror circuit has two transistors coupled to a supply potential at the emitter side, which transistors are scaled in such a manner that the current supplied by the amplifier arrangement at its output side is twice as large as the input current applied to the arrangement.