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. 29, 1999
Filed:
Nov. 27, 1995
Soichi Tsumura, Tokyo, JP;
NEC Corportion, Tokyo, JP;
Abstract
A compact level control circuit without using a shield structure is suitably provided in a small space such as a portable radio communication apparatus. A level control circuit for a portable radio communication apparatus arranged by: a first variable attenuator into which an input RF (radio frequency) signal is supplied, the attenuation amount of which is controlled based upon a first level control signal, and which outputs a first attenuated RF signal; a frequency converter for frequency-converting the first attenuated RF signal into a predetermined intermediate frequency band signal to thereby output a first IF (intermediate frequency) signal; a second variable attenuator into which the first IF signal is supplied, the attenuation amount of which is controlled based on the first level control signal, and which outputs a second attenuated IF signal; and a bandpass filter for outputting only said predetermined intermediate frequency band component of the second attenuated IF signal.