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Class Information
Number: 455/120
Name: Telecommunications > Transmitter > Including tuning
Description: Subject matter including a resonant network or crystal whose resonant frequency may be varied (tuned) to control or modify the operating frequency of the transmitter, or which may be substituted for other resonant networks or crystals, as by switching, to control or modify the operating frequency of the transmitter.

Sub-classes under this class:

Class Number Class Name Patents
455/125 Automatic adjustment of tuning 158
455/124 Distributed parameter device 36
455/121 In antenna circuit 215

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
7747228 Tuning circuitry in a communications device Jun. 29, 2010
7515935 Method and system for flexible FM tuning Apr. 7, 2009
7512384 Control unit and a control method Mar. 31, 2009
7499681 Apparatus, system, and method for managing an antenna network during a half duplex call Mar. 3, 2009
7482873 Preserving linearity of a rf power amplifier Jan. 27, 2009
7437130 Smart tuning AM transmitter Oct. 14, 2008
7394880 Method and apparatus for simulating radio channel Jul. 1, 2008
7366473 Method and apparatus for diversity switching control Apr. 29, 2008
7359684 Wireless communication system with variable intermediate frequency transmitter Apr. 15, 2008
7330708 Tuning circuit with amplitude attenuation function and integrated circuit for radio communication apparatus Feb. 12, 2008
7236741 Methods and apparatus for tuning in an inductive system Jun. 26, 2007
7236802 Coupling device for interfacing power amplifier and antenna in differential mode Jun. 26, 2007
7184720 Method and device for simulating radio channel Feb. 27, 2007
7167686 Wireless communications transceiver: transmitter using a harmonic rejection mixer and an RF output offset phase-locked loop in a two-step up-conversion architecture and receiver using direct c Jan. 23, 2007
7142811 Wireless communication over a transducer device Nov. 28, 2006
7142830 Adaptive transceiver system Nov. 28, 2006
7127217 On-chip calibration signal generation for tunable filters for RF communications and associated methods Oct. 24, 2006
7099635 High-efficiency modulating RF amplifier Aug. 29, 2006
6985702 Transceiver with frequency multiplier tracked to frequency generator Jan. 10, 2006
6980776 Transceiver apparatus Dec. 27, 2005
6906684 Controlling a telescopic antenna mast Jun. 14, 2005
6898419 Remotely adjustable bandpass filter May. 24, 2005
6804540 Remote band-pass filter in a distributed antenna system Oct. 12, 2004
6766150 System and method for tuning a narrowband cavity filter used in a CDMA transmitter Jul. 20, 2004
6763227 Systems and methods for modulator calibration Jul. 13, 2004
6671501 Signal transmission circuit Dec. 30, 2003
6597925 Transmitter circuit with frequency self-optimization Jul. 22, 2003
6580900 Tuning arrangement Jun. 17, 2003
6295443 Automatic tuning AM transmitter Sep. 25, 2001
6212367 Mobile telephone apparatus with tunable filter tuned to the transmit band Apr. 3, 2001
6115584 Transmitter-receiver for use in broadband wireless access communications systems Sep. 5, 2000
6072993 Portable radio transceiver with diplexer-switch circuit for dual frequency band operation Jun. 6, 2000
6058294 Adjustable frequency stabilizing internal chip capacitor system May. 2, 2000
5991606 Apparatus for filtering signals of an antenna arrangement and a sender/receiver arrangement with two or more antennae Nov. 23, 1999
5689219 Summing network Nov. 18, 1997
5673003 Amplifier circuit having a variable bandwidth Sep. 30, 1997
5530921 Enhanced system and method for implementing a backup control channel in a cellular telecommunication network Jun. 25, 1996
5408495 Multiple cavity tuning of a transmitter output in a communication system Apr. 18, 1995
5345200 Coupling network Sep. 6, 1994
5276921 Transmitter with nonlinearity correction circuit Jan. 4, 1994
4977610 Wireless communication apparatus and method of operating same Dec. 11, 1990
4817193 AM transmitter having single tuning means for oscllator, carrier isolator and antenna Mar. 28, 1989
4679003 Frequency divider circuit and frequency synthesizer using the same Jul. 7, 1987
4612668 FM wireless transmitter Sep. 16, 1986
4502025 High speed PIN diode switched antenna coupler and method Feb. 26, 1985
4291284 Antenna coupler Sep. 22, 1981
4234965 Communication tuning system utilizing local oscillator frequency selection for maximum RF filter bandwidth and method thereof Nov. 18, 1980
4213152 Output circuit for video tape recorder Jul. 15, 1980
4131850 Single side band radio apparatus Dec. 26, 1978
4128808 Channel frequency analyser Dec. 5, 1978

1 2 3

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