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:
Jun. 23, 1981
Filed:
Oct. 23, 1979
Fumio Nakayama, Kyoto, JP;
Toshikazu Funahara, Kyoto, JP;
Abstract
An active filter includes two differential amplifiers. The first amplifier has its inverting input connected to an input terminal of the active filter, its non-inverting input connected to ground through a resistor. A resistor and a capacitor are connected in parallel between the inverting input and output of the first amplifier. The second amplifier has its non-inverting input connected through a resistor to the output of the first differential amplifier and also through a capacitor to ground, its inverting input connected through a resistor to ground and also through a capacitor to its output. A resistor is connected between output of the second amplifier and the inverting input of the first amplifier.