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. 12, 1998
Filed:
Jul. 08, 1996
Tatsuya Miya, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A frequency converter has low noise figure and high conversion gain characteristics, and can drive directly a 50 Ohm load. In one embodiment, a dual-gate FET is employed that is composed of a first and second FET as the frequency mixing elements, and a third FET is connected in parallel to the first. The gate voltage of the first FET is set to be substantially equal to the pinch-off voltage in order to thereby ensure low noise figure. The second FET is set to a high g.sub.m, from which a frequency-converted signal is outputted. The gate bias of the third FET is set to provide a path for the current flowing through the second FET. As a result, the second FET can be set to a high g.sub.m regardless of the gate voltage of the first FET, in order to ensure high conversion gain.