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:
Aug. 27, 2013
Filed:
May. 14, 2012
Hiroshi Kawaguchi, Kobe, JP;
Masahiko Yoshimoto, Kobe, JP;
Toshihiro Konishi, Kobe, JP;
Shintaro Izumi, Kobe, JP;
Hiroshi Kawaguchi, Kobe, JP;
Masahiko Yoshimoto, Kobe, JP;
Toshihiro Konishi, Kobe, JP;
Shintaro Izumi, Kobe, JP;
Semiconductor Technology Academic Research Center, Kanagawa, JP;
Abstract
An AD converter includes a VT converter circuit part which inputs an analog input voltage and a sampling clock, converts the analog input voltage to a corresponding delay time, and outputs time domain data. A ring oscillator circuit part of N stages inputs the time domain data, and an error propagation circuit part takes out delay information containing a quantization error from phase information of the ring oscillator circuit part of the previous stage, and propagate the delay information to the ring oscillator circuit part of a subsequent stage. A counter circuit part measures a number of waves of an output oscillation waveform of the ring oscillator circuit part of each stage, and an output signal generator part generates an output signal from an output counted value of each counter circuit part. A reset part resets each error propagation circuit part and each counter circuit part with a sampling clock.