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. 10, 2007
Filed:
Apr. 24, 2006
Masafumi Uemori, Saitama, JP;
Haruo Kobayashi, Gunma, JP;
Tomonari Ichikawa, Gunma, JP;
Koichiro Mashiko, Hyogo, JP;
Masafumi Uemori, Saitama, JP;
Haruo Kobayashi, Gunma, JP;
Tomonari Ichikawa, Gunma, JP;
Koichiro Mashiko, Hyogo, JP;
Semiconductor Technology Academic Research Center, Yokoshama-shi, JP;
Abstract
A continuous-time band-pass ΔΣ AD modulator subtracts an analog signal from a DA converter from an inputted analog signal, outputs an analog signal having a subtraction result to an AD converter via a continuous-time analog band-pass filter, outputs a digital signal from the AD converter to the DA converter, and outputs the same digital signal as a digital signal subjected to a band-pass ΔΣ AD modulation processing. The highest input frequency 'fin' of the inputted analog signal is substantially set to three-fourths of a sampling frequency 'fs'. The DA converter is configured to convert the inputted digital signal into the analog signal, and outputs the analog signal, which is inverted or not in response to a value of the inputted digital signal and has an amplitude of substantially zero and a gradient of substantially zero at a timing k/(2fs).