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:
Jun. 01, 1993
Filed:
Jun. 10, 1992
Hilmer I Swanson, Quincy, IL (US);
Harris Corporation, Melbourne, FL (US);
Abstract
An amplifier system is disclosed having distortion reduction. The system includes a pulse duration modulator having an input circuit for receiving an input signal, such as an audio signal, for providing a train of pulses exhibiting a fixed repetition rate and a fixed amplitude and having varying widths dependent upon the magnitude of the input signal. A switch is provided having an input circuit for receiving the PDM pulses and responds thereto so as to be on for a duration dependent upon the pulse width. The switch has an output circuit connected in series with a load across a DC voltage source to provide an amplified output signal to the load. A signal detector is connected to the output circuit to provide a correction signal having a value that various proportional to that of the amplified output signal. The input signal is divided by the correction signal prior to application to the input circuit of the pulse duration modulator.