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Class Information
Number: 330/150
Name: Amplifiers > Cascaded similar amplifying device of different characteristics
Description: Subject matter including at least two stages of amplification (each stage as defined in the class definition and each stage having a vacuum tube amplifying device) such that, the input signal for each stage, except the first, is the output signal of the preceding stage, and wherein at least one of the cascaded amplifying devices has a significant difference in its characteristics such as a difference in the number of electrodes, or where the construction of each of at least two of the tubes is such that there is a difference in the tube characteristics, or where because of differences in biasing or energizing voltages the tube characteristics are different.

Patents under this class:

Patent Number Title Of Patent Date Issued
8619847 Reconditioning equalizer filter for non-constant envelop signals Dec. 31, 2013
8401058 Channelized amplifier system and method Mar. 19, 2013
8390502 Charge redistribution digital-to-analog converter Mar. 5, 2013
8160275 Apparatus and method for an integrated, multi-mode, multi-band, and multi-stage power amplifier Apr. 17, 2012
8125270 Frequency offset Cartesian feedback system Feb. 28, 2012
8026759 Multistage amplifying circuit Sep. 27, 2011
7948324 Power efficient multistage amplifier and design method May. 24, 2011
7817713 Enhanced reconditioning equalizer filter for non-constant envelop signals Oct. 19, 2010
7791411 Amplifier arrangement and method for amplifying a signal Sep. 7, 2010
7733260 Multistage amplifier and a method of settling the multistage amplifier Jun. 8, 2010
7728658 Low-noise, low-distortion digital PWM amplifier Jun. 1, 2010
7605651 Multimode amplifier for operation in linear and saturated modes Oct. 20, 2009
7589586 High frequency signal detection circuit Sep. 15, 2009
7583150 Power efficient multistage amplifier and design method Sep. 1, 2009
7395034 Clipping circuit and radio transmitter using the same Jul. 1, 2008
7289575 Signal processing means Oct. 30, 2007
7176910 Driving circuit for display device Feb. 13, 2007
7106132 Feed-forward operational amplifiers and methods of using the same Sep. 12, 2006
7053717 Method and apparatus for realizing a low noise amplifier May. 30, 2006
6927628 Gain-control method and device for cascaded amplifiers Aug. 9, 2005
6873703 Precision, low-power current-sense transmission channel for subscriber line interface circuit, programmable with single ended impedances and capable of exhibiting a voltage sense response Mar. 29, 2005
6861910 Multistage amplifier and integrated circuit Mar. 1, 2005
6753727 Sequential DC offset correction for amplifier chain Jun. 22, 2004
6750724 Multistage amplifier Jun. 15, 2004
6680647 Low noise amplifier circuit with phase matched switch topology Jan. 20, 2004
6577187 Powered transducer preamplifier with DC level shifting circuit Jun. 10, 2003
6573787 Elimination of noise during power supply switching in an audio amplifier circuit Jun. 3, 2003
6566942 Multistage amplifier circuit May. 20, 2003
6556077 Instrumentation amplifier with improved AC common mode rejection performance Apr. 29, 2003
6532357 Radio communication device and transmission power control method for radio communication device Mar. 11, 2003
6480062 Reflection amplifier circuit Nov. 12, 2002
6466091 High order multi-path operational amplifier with reduced input referred offset Oct. 15, 2002
6380804 Method and apparatus for switching stages of a multistage amplifier quickly between operational modes Apr. 30, 2002
6342811 Integrated power amplifier which allows parallel connections Jan. 29, 2002
6342810 Predistortion amplifier system with separately controllable amplifiers Jan. 29, 2002
6333673 Electronic circuit Dec. 25, 2001
6271784 Capacitor-based digital-to-analog converter with continuous time output Aug. 7, 2001
6236265 Radio station preamplifier circuit with interior and exterior preamplifiers May. 22, 2001
6232836 In-line, unbalanced amplifier, predistortion circuit May. 15, 2001
6140870 Hybrid thermionic valve and solid state audio amplifier Oct. 31, 2000
6043721 Dual band amplifier Mar. 28, 2000
5912585 Vacuum tube audio amplifying circuit Jun. 15, 1999
5361039 Power amplifier device for a composite signal Nov. 1, 1994
5006814 Current amplifier Apr. 9, 1991
4338530 Low-pass filter for low-frequency signals Jul. 6, 1982

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