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:
Feb. 12, 2008
Filed:
Mar. 08, 2006
Ken Yamamura, Sagamihara, JP;
Akihiro Ikehara, Kawasaki, JP;
Naoko Hyodo, Isesaki, JP;
Asahi Kasei Microsystems Co., Ltd., Tokyo, JP;
Abstract
There is provided a digital switching amplifier capable of enhancing an S/N ratio at the time of a small signal output and reducing current consumption and electromagnetic interference (EMI). The digital switching amplifier according to the present invention is provided with an integratorfor integrating an input signal, quantizerfor quantizing the output signal of the integratorwith resolutions different for each of the predetermined signal regions, pulse width modulatorfor performing pulse width modulation for each of signals quantized with different resolutions by the quantizerusing different proportionality coefficients, switching circuitfor providing the loadwith electrical signals different in value for each of pulse-width modulated signals with different proportionality coefficients by the pulse width modulatorin response to the pulse-width modulated signal, and feedback circuitfor negatively feeding back the output of the quantizerto the input of the integrator