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:
May. 17, 1994
Filed:
Apr. 26, 1993
Applicant:
Inventor:
Futao Yamaguchi, Kanagawa, JP;
Assignee:
Sony Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ; G06G / ; G06G / ;
U.S. Cl.
CPC ...
307520 ; 307529 ; 307542 ; 307359 ; 307494 ; 328127 ; 328165 ; 328167 ;
Abstract
In a filter circuit of a capacity ground type in which the capacitance connected to output terminals of integrators is grounded, output signals are fed back from multiple stages of integrators to respective input stages of a subtracter which constitute a differential couple with input stages of the first stage integrator, and in the subtracter input signals are subtracted by fed back signals of the multiple stages and are then outputted. It is thereby capable to constitute a high-pass filter in a filter circuit of the capacity ground type with ease.