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:
Sep. 13, 1994
Filed:
Sep. 02, 1992
Hitachi, Ltd., Tokyo, JP;
Abstract
The difference between the output current of a voltage-current converter circuit and the output current of a local D/A converter circuit 2, whose output current is controlled by a feedback signal, is integrated by an analog circuit of which one end is connected to a DC potential point, and the voltage obtained by the integration thereof is quantized by a quantizing circuit. The result is integrated by a digital integrating circuit and is fed to a feedback correcting circuit 6 and, further, the result of A/D conversion is output. The feedback correcting circuit outputs a temporary feedback signal while the digital integration is being operated based on the output of the quantizing circuit. After the digital integrating operation completes the digital integration operation, a corrected feedback signal is generated instead of the temporary feedback signal. The signals inputted into the analog circuit 3 are continuously sampled even while the digital integration operation is being carried out.