Title:
A/D CONVERSION CIRCUIT AND IMAGE-CAPTURING DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/171230
Kind Code:
A1
Abstract:
This A/D conversion circuit comprises: a reference signal generating section that generates a reference signal that changes in accordance with a constant current output by a first constant-current source; a comparison section that executes a comparison process between an analog signal and said reference signal, and that terminates said comparison process at a timing when said reference signal satisfies a predetermined condition with respect to said analog signal; a clock generating section that, in accordance with a constant current output by a second constant-current source, outputs a lower phase signal based on a signal output from a plurality of delay units; a latching section that latches said lower phase signal at a timing related to the termination of said comparison process; and a counting section that counts a clock based on said lower phase signal. The first constant-current source outputs a current that is m times a unit current that is output by a unit current source in accordance with a bias voltage. The second constant-current source outputs a current that is n times said unit current. Digital data corresponding to said analog signal is output on the basis of said lower phase signal latched by the latching section and a count result of the counting section.
More Like This:
Inventors:
HAGIHARA YOSHIO (JP)
Application Number:
PCT/JP2014/056638
Publication Date:
October 23, 2014
Filing Date:
March 13, 2014
Export Citation:
Assignee:
OLYMPUS CORP (JP)
International Classes:
H03M1/56; H04N5/378
Foreign References:
| JP2011055196A | 2011-03-17 | |||
| JP2011250009A | 2011-12-08 |
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
Sumio Tanai (JP)
Sumio Tanai (JP)
Download PDF:
Previous Patent: COMMUNICATION APPARATUS, CONTROL METHOD, AND STORAGE MEDIUM
Next Patent: PAPER STOCK PROCESSING DEVICE
Next Patent: PAPER STOCK PROCESSING DEVICE