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Class Information
Number: 455/340
Name: Telecommunications > Receiver or analog modulated signal frequency converter > With particular receiver circuit > Coupling or decoupling between stages > Variably tunable or adjustable
Description: Systems wherein the coupling or decoupling means is recited as variably tunable or adjustable whereby the extent of the effective coupling or the width of the band passed by the network may be varied.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7065337 |
Tuner for digital terrestrial broadcast signals |
Jun. 20, 2006 |
| 7050781 |
Self-calibrating tunable filter |
May. 23, 2006 |
| 7050778 |
Direct conversion turner |
May. 23, 2006 |
| 7039385 |
Method and apparatus for automatic center frequency tuning of tunable bandpass filters |
May. 2, 2006 |
| 7013124 |
Wide band tuner |
Mar. 14, 2006 |
| 7002427 |
Filter trimming |
Feb. 21, 2006 |
| 6999742 |
By-passing adjacent channel interference removal in receivers |
Feb. 14, 2006 |
| 6977545 |
FM signal receiver and wireless communications device using same |
Dec. 20, 2005 |
| 6970701 |
Radio calibration by correcting the crystal frequency |
Nov. 29, 2005 |
| 6970685 |
Method and apparatus for dynamic filter selection in radio receivers |
Nov. 29, 2005 |
| 6968173 |
Tuner |
Nov. 22, 2005 |
| 6959178 |
Tunable upconverter mixer with image rejection |
Oct. 25, 2005 |
| 6959170 |
Communications receivers and methods therefor |
Oct. 25, 2005 |
| 6957054 |
Radio receiver having a variable bandwidth IF filter and method therefor |
Oct. 18, 2005 |
| 6915121 |
Integrated tunable filter for broadband tuner |
Jul. 5, 2005 |
| 6914437 |
Filter calibration and applications thereof |
Jul. 5, 2005 |
| 6909882 |
Signal processing semiconductor integrated circuit device and wireless communication system |
Jun. 21, 2005 |
| 6895190 |
Switchable bandwidth lowpass filter |
May. 17, 2005 |
| 6871055 |
Direct conversion receiver, mobile radio equipment using the same, and RF signal receiving method |
Mar. 22, 2005 |
| 6868135 |
Method and apparatus for correcting for a phase shift between a transmitter and a receiver |
Mar. 15, 2005 |
| 6842610 |
Tuner |
Jan. 11, 2005 |
| 6721544 |
Duplexer structure for coupling a transmitter and a receiver to a common antenna |
Apr. 13, 2004 |
| 6686809 |
Filter trimming |
Feb. 3, 2004 |
| 6681102 |
Adjustable filter |
Jan. 20, 2004 |
| 6643503 |
Wireless speaker for radio communication device |
Nov. 4, 2003 |
| 6631265 |
Apparatus and methods for tuning bandpass filters |
Oct. 7, 2003 |
| 6553216 |
RF tunable filter arrangement with tunable image trap |
Apr. 22, 2003 |
| 6542724 |
Method and apparatus for performing image signal rejection |
Apr. 1, 2003 |
| 6535722 |
Television tuner employing micro-electro-mechanically-switched tuning matrix |
Mar. 18, 2003 |
| 6453157 |
Radio frequency tracking filter |
Sep. 17, 2002 |
| 6445735 |
Switched bandwidth digital filters with reduced transients during switching |
Sep. 3, 2002 |
| 6424824 |
Apparatus for setting the tuning voltage of tunable resonant circuits |
Jul. 23, 2002 |
| 6400932 |
Low offset automatic frequency tuning circuits for continuous-time filter |
Jun. 4, 2002 |
| 6377788 |
Tunable filter in radio receiver |
Apr. 23, 2002 |
| 6347222 |
Tuning method and transceiver unit |
Feb. 12, 2002 |
| 6324390 |
Fully integrated all-CMOS AM receiver |
Nov. 27, 2001 |
| 6321384 |
Noise reduction in cable return paths |
Nov. 20, 2001 |
| 6278870 |
Phasing receivers |
Aug. 21, 2001 |
| 6266522 |
Apparatus and methods for tuning bandpass filters |
Jul. 24, 2001 |
| 6243570 |
Radio receiver capable of temperature adjustment to tuning frequency of RF tuning circuit |
Jun. 5, 2001 |
| 6192253 |
Wrist-carried radiotelephone |
Feb. 20, 2001 |
| 6134430 |
Programmable dynamic range receiver with adjustable dynamic range analog to digital converter |
Oct. 17, 2000 |
| 6115590 |
Radiotelephone unit |
Sep. 5, 2000 |
| 6097269 |
Electrically tunable band pass filter with symmetrical low-side and high-side protection |
Aug. 1, 2000 |
| 6088569 |
Method and apparatus for receiving a plurality of signals having different frequency bandwidths |
Jul. 11, 2000 |
| 6064866 |
Switchable bandpass filter for a multiband tuner |
May. 16, 2000 |
| 6047171 |
Method and apparatus for combating adjacent channel interference using multiple IF filters |
Apr. 4, 2000 |
| 6032032 |
Mobile radio communication apparatus |
Feb. 29, 2000 |
| 6023609 |
Device for separating transmitting waves and receiving waves and a radio communication equipment provided with the device |
Feb. 8, 2000 |
| 6014554 |
Method and apparatus for tuning analog filters |
Jan. 11, 2000 |
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