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:
Jan. 08, 2002
Filed:
May. 26, 2000
Abstract
To achieve linear gain control (with a flatness of ±1 dB) over a wide range of 70 dB or greater using a single control voltage, an attenuator of the following configuration is provided in a radio frequency section of a transmitter of a cellular mobile telephone terminal. That is, a signal inputpart ( ) and signal output part ( ) for a radio frequency signal are connected by a signal line ( ) containing at least two series variable resistors ( and ); parallel variable resistors ( and ) are connected between a ground line ( ) and the signal inputpart ( ) and signal outputpart ( ), respectively; a gain control line ( ) is connected to the variable resistors ( , and ); reference voltage application parts ( , and ) are connected to the variable resistors ( , and ), respectively; and a gain control voltage application part ( ) is connected to each of the variable resistors ( , and ) via the gain control line ( ).