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:
Nov. 16, 1993
Filed:
Mar. 09, 1992
Yasufumi Nakajima, Osaka, JP;
Toshihiko Oohashi, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A pulse-width modulation amplifier includes a triangular signal oscillator for generating a triangular carrier signal. A voltage comparator compares an input analog signal and the triangular carrier signal, and converts the input analog signal into a corresponding pulse-width modulation signal. A power amplifier serves to amplify the pulse-width modulation signal. A low pass filter removes carrier components from an output signal of the power amplifier, and generates a demodulated signal corresponding to the input analog signal. The amplitude of the triangular carrier signal is controlled in response to a power supply voltage fed to the power amplifier so that the amplitude of the triangular carrier signal will be substantially proportional to the power supply voltage.