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:
May. 07, 2013
Filed:
Feb. 24, 2010
Hao San, Kiryu, JP;
Haruo Kobayashi, Kiryu, JP;
Hao San, Kiryu, JP;
Haruo Kobayashi, Kiryu, JP;
National University Corporation Gunma University, Maebashi-shi, JP;
Abstract
To provide a complex bandpass ΔΣAD modulator capable of suppressing the influence of an image component caused by a mismatch between I- and Q-channels on a signal component with low power consumption. A complex bandpass ΔΣAD modulatoris configured by a subtraction unit, a complex bandpass filter, an addition unit, a noise extraction circuit unit, an ADC unit, and a DAC unit. The noise extraction circuit unitextracts a quantized noise signal of the ADC unitbased on an input signal of the ADC unitand an output signal of the DAC unit, delays the extracted quantized noise signal by one sample time, phase-rotates the delayed signal by a predetermined angle, and feeds back the rotated signal to the input side of the ADC unit. Thus, a complex bandpass ΔΣAD modulator capable of suppressing the influence of the image component caused by a mismatch between I- and Q-channels on the signal component with low power consumption is provided.