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. 28, 1992
Filed:
Jun. 12, 1990
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a sampling mode, a servo signal sampling and holding switch (4.sub.a) and a reference voltage sampling and holding switch (30.sub.a) are turned off, so that transistors (Q.sub.7a, Q.sub.5a) are turned on. In response to on states of the transistors (Q.sub.7a, Q.sub.5a), capacities (C.sub.3a, C.sub.30a) are charged with the peak voltage (V.sub.ref +(1/2)V.sub.s) of a servo signal and a reference voltage (V.sub.ref), respectively. In a holding mode, the sampling and holding switches (4.sub.a, 30.sub.a) are turned on, so that the transistors (Q.sub.7a, Q.sub.5a) are turned off. the charging voltages (D, E) of the capacitors (C.sub.3a, C.sub.30a) are discharged through post-stage buffers (5.sub.a, 3.sub.a), so that they include offsets which are canceled through a subtractor (6.sub.a).