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:
Jan. 24, 2012
Filed:
Mar. 04, 2010
Chien Hua Cheng, Xihu Township, Shanghua County, TW;
Tim Kuei Shia, Taiping, TW;
Jia Chun Huang, Toufen Township, Miaoli County, TW;
Chien Hua Cheng, Xihu Township, Shanghua County, TW;
Tim Kuei Shia, Taiping, TW;
Jia Chun Huang, Toufen Township, Miaoli County, TW;
Industrial Technology Research Institute, Chutung, Hsinchu, TW;
Abstract
A quantizer of a sigma-delta modulator includes a pulse width modulator (PWM), a converter and a voltage level tracing device. The PWM receives an input signal, and generates a PWM signal according to one or more sawtooth waves and one or more reference voltages. The converter is connected to the output of the PWM and digitizes the PWM signal to generate an output digital value. The voltage level tracing device is connected to the output of the converter, and receives the output digital value to generate a reference voltage adjustment value. The reference voltage adjustment value is transmitted to the PWM for adjusting the reference voltage, so as to change the next corresponding voltage level of the sawtooth wave to track the input signal.