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:
Nov. 27, 1984
Filed:
Jun. 02, 1982
Tetsuo Sato, Takasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A variable electronic impedance circuit is constructed of a voltage-current converter whose input terminal is supplied with an input signal voltage, and a variable-gain current amplifier whose input terminal is supplied with an output current of the voltage-current converter and whose output signal current is fed back to the input terminal of the voltage-current converter. In order to prevent the undesirable oscillation phenomenon of the variable electronic impedance circuit immediately after the closure of a power supply, a control circuit which operates for a predetermined time after the closure of the power supply is especially arranged. Since an output signal from the control circuit inhibits the operation of the variable-gain current amplifier during the predetermined time, the unstable operation immediately after the closure of the power supply can be prevented.