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:
Oct. 23, 1984
Filed:
Dec. 03, 1981
Sven Mattisson, Bjarred, SE;
Inventab Audio Kb, Lund, SE;
Abstract
An amplifier (10) is disclosed including circuity for improving the amplifiers performance, particularly the common mode rejection of differential amplifiers, by adding the amplifier input signal to the power supply signals which power the amplifier. Voltage dividers (42, 44) are connected between the amplifier output (16) and each of the two power supply rails (26, 28). Each divider includes resistors (46, 48; 50, 52) selected so that the amplifier output is divided down by a factor equal to the gain of the amplifier. The junction signals (V.sub.J1, V.sub.J2) provided by the two voltage dividers thus each includes a component equal to the input signal. The junction voltages are applied to the amplifier power input terminals (18, 20) by respective transistors (60, 62), each connected in a voltage follower arrangement. One embodiment (FIG. 4) incorporates a servo amplifier (100) for DC offset stabilization. Impedances (104, 106) couple the output of the servo amplifier to the voltage dividers so that no loss in common mode rejection results from servo operation.