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:
Jan. 30, 2007
Filed:
Jun. 25, 2002
Jan Mulder, Houten, NL;
Hugo Veenstra, Eindhoven, NL;
Giuseppe Grillo, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The present invention relates to an amplifier intended to deliver to a load impedance RL connected between two output terminals of the amplifier an output current Iout which is representative of an input signal (Vin, −Vin) applied to two input terminals of the amplifier, which amplifier includes a first and a second transistor Tand Tconnected as a differential pair around the load impedance RL. The amplifier according to the invention further includes a third and a fourth transistor Tand Twhich form a differential pair; degenerated by means of a degenerating impedance Req which has a nominal value equal to that of the load impedance RL of the amplifier, which differential pair (T, T) is intended to be controlled by means of a control signal (−Vin/, Vin/), in anti-phase with the input signal (Vin, −Vin). The invention permits to double the output current Iout of the amplifier without, however, increasing its power consumption.