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:
Sep. 28, 2004
Filed:
Aug. 01, 2000
Toshikazu Nakajima, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A transmitter suitable for a CDMA mobile terminal is provided which realizes a circuit with a small size and low consumption power which suppresses the effect of carrier leak in the state where a transmission output is controlled at a low level. A carrier control circuit comprises a reference voltage generator, a comparator, and a controller. The comparator determines whether the level of a control signal is higher or lower than a reference voltage. The controller controls the gain of a local variable amplifier such that a distortion characteristic of a transmission output is optimal when the control signal is higher than the reference voltage, and controls the gain of the local variable amplifier such that the effect of carrier leak on the transmission output is suppressed when the control signal is lower than the reference voltage based on the determination result of the comparator.