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:
Dec. 05, 1989
Filed:
Jul. 20, 1988
Tsutomu Wakimoto, Atsugi, JP;
Yukio Akazawa, Isehara, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
Wideband amplifier having a differential amplifier or single-ended amplifier and having a capacitaqnce compensation circuit is disclosed. The amplifier detects the voltage variations of a signal input node or a signal output node, generates a compensation current equal in magnitude and opposite in direction to a current flowing in a parasitic capacitance such as a transistor junction capacitance, and cancels the parasitic capacitance associated with a node by supplying the compensation current in a reverse phase to the node to which the parasitic capacitance is attached. As a result, a wideband amplifier is achieved, and it can also be used as a high-speed comparator. Further, harmonic distortions causing from the voltage dependency of the parasitic capacitance can be reduced by flowing the compensation current corresponding to a voltage impressed to the junction capacitance.