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. 28, 1999
Filed:
Nov. 04, 1997
Masahiro Kato, Nagaokakyo, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The invention provides a two-output low-noise down converter circuit which is improved in the isolation between two outputs. In the two-output low-noise down converter circuit, an input signal is divided into two divisional signals of different polarization systems and then the divisional two signals are processed by two-system signal processing circuits which comprise low-noise amplifiers, band-pass filters, frequency converter circuits and a local oscillator, respectively. The two-output low-noise down converter circuit includes: a switching circuit for performing switching control on the outputs of the two signal processing circuits responsive to the voltages applied to two output terminals, and for selectively outputting two polarized signals to its output terminals; intermediate frequency amplifiers for amplifying the two outputs of the switching circuit and leading out the resulting outputs at the two output terminals; and a control circuit for controlling the turning-on and -off of the power of the intermediate frequency amplifiers responsive to loads of the two output terminals.