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:
Jul. 15, 2003
Filed:
Feb. 03, 2000
Edoardo Botti, Vigevano, IT;
Antonio Grosso, Milan, IT;
STMicroelectronics S.r.l., Agrate Brianza, IT;
Abstract
A digital input PWM power amplifier includes an oversampling and noise shaping circuit receiving pulse code modulated (PCM) digital input data organized in words of a first number of M bits at a bit rate, and outputting PCM digital data organized in words of a smaller number of N bits at a multiple bit rate. A first bus transmits a first number of most significant bits (MSB) of the N bit words output from the oversampling and noise shaping circuit, and a second bus transmits a second number of least significant bits (LSB) of the N bit words output from the oversampling and noise shaping circuit. First and second PCM/PWM converters are respectively fed with the first and second number of bits transmitted through the first and second buses. The PWM signal output by the first converter is summed to an attenuated PWM signal output by the second converter on the inverting input node of the output power stage.