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:
Jul. 20, 2004
Filed:
May. 24, 2000
Mitchell K. Johnson, McKinney, TX (US);
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
There is disclosed a system for tuning a tunable narrowband cavity filter in a base station transmitter of a wireless network. The radio frequency (RF) transmitter comprises: 1) modulation circuitry for modulating an input baseband signal to produce a first RF signal; 2) amplification circuitry for amplifying the first RF signal; 3) a tunable narrowband cavity filter for filtering the amplified first RF signal and transmitting the filtered and amplified first RF signal to an antenna coupled to an output of the tunable narrowband cavity filter; and 4) a system for tuning the tunable narrowband cavity filter. The system for tuning the tunable narrowband cavity filter comprises: a) a filter calibration signal injection circuit for combining an input calibration signal with the input baseband signal; and b) a filter calibration circuit coupled to the output of the tunable narrowband cavity filter for detecting an RF output calibration signal corresponding to the input calibration signal, determining a signal level of the RF output calibration signal, and adjusting a center frequency of a pass band of the tunable narrowband cavity filter in response to the signal level determination.