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Class Information
Number: 330/302
Name: Amplifiers > With semiconductor amplifying device (e.g., transistor) > Including frequency-responsive means in the signal transmission path
Description: Subject matter including frequency-responsive means in the signal transmission path that causes corresponding changes in the amplifier gain.










Sub-classes under this class:

Class Number Class Name Patents
330/306 And bandpass, broadband (e.g., wideband) or sidepass means 358
330/304 And equalizing means 114
330/305 And tuning means 261
330/303 Including an active device in the filter means 127


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14

Patent Number Title Of Patent Date Issued
6130589 Matching circuit and a method for matching a transistor circuit Oct. 10, 2000
6127886 Switched amplifying device Oct. 3, 2000
6127887 High gain, impedance matching low noise RF amplifier circuit Oct. 3, 2000
6121841 Transistor power amplifier for portable terminals for mobile communications Sep. 19, 2000
6114911 Power amplifier Sep. 5, 2000
6104259 Harmonic suppression circuit Aug. 15, 2000
6104247 Power amplifier for mobile communication system Aug. 15, 2000
6104236 Apparatus and method for equalizing received network signals using a transconductance controlled biquadratic equalizer Aug. 15, 2000
6084469 MR-preamp using collector and emitter coupling integrated capacitors Jul. 4, 2000
6081160 Method and apparatus for increasing the bandwidth, and reducing the size, of the DC feed network for wideband RF amplifiers using selective placement of high dielectric constant material Jun. 27, 2000
6075414 High frequency amplifier having a variable attenuator connected to the base of an amplifier FET Jun. 13, 2000
6052033 Radio frequency amplifier system and method Apr. 18, 2000
6052029 Stabilizing circuit and amplifier Apr. 18, 2000
6023197 Amplifier suitable for cable-network applications Feb. 8, 2000
6005441 Amplifying circuit Dec. 21, 1999
5999058 Microwave amplifier Dec. 7, 1999
5982236 High-frequency power amplifier Nov. 9, 1999
5977834 Preamplifier system Nov. 2, 1999
5963089 Semiconductor amplifying apparatus and communication terminal apparatus Oct. 5, 1999
5960334 Amplifier and portable telephone apparatus using the same Sep. 28, 1999
5955926 Power amplifier and chip carrier Sep. 21, 1999
5942943 Electrical power amplifier device Aug. 24, 1999
5933057 Low noise amplifier Aug. 3, 1999
5926069 Low noise amplifier Jul. 20, 1999
5923218 Device with amplifier means including safety means, and with filter means connected to the amplifier means Jul. 13, 1999
5923206 Charge injection cancellation technique Jul. 13, 1999
5914641 Gate voltage control circuit of a power amplifier Jun. 22, 1999
5912590 Broad-band amplifier circuit and high-speed communication element using the same Jun. 15, 1999
5905409 Microwave and millimeter wave circuit including amplifier and band elimination filters May. 18, 1999
5889434 Microwave power amplifier Mar. 30, 1999
5805023 High frequency amplifier, receiver, and transmitter system Sep. 8, 1998
5770970 Transmitter of wireless system and high frequency power amplifier used therein Jun. 23, 1998
5726606 Pre-emphasis network with variable time delay Mar. 10, 1998
5699019 Active filter Dec. 16, 1997
5694085 High-power amplifier using parallel transistors Dec. 2, 1997
5592122 Radio-frequency power amplifier with input impedance matching circuit based on harmonic wave Jan. 7, 1997
5590412 Communication apparatus using common amplifier for transmission and reception Dec. 31, 1996
5548248 RF amplifier circuit Aug. 20, 1996
5548246 Power amplifier including an impedance matching circuit and a switch FET Aug. 20, 1996
5532647 Receiver having ACG circuit Jul. 2, 1996
5473281 Amplifier circuit having impedance matching circuit Dec. 5, 1995
5469107 Microwave amplifier Nov. 21, 1995
5467093 Logarithmic detector Nov. 14, 1995
5457427 High-frequency amplifier means with enhanced output resistance Oct. 10, 1995
5446415 Intermediate frequency amplifier circuit Aug. 29, 1995
5424686 Negative-resistance-compensated microwave buffer Jun. 13, 1995
5406226 Stable, narrow bandwidth, high frequency amplifier with low power consumption Apr. 11, 1995
5406224 Circuit for stabilizing RF amplifier Apr. 11, 1995
5382918 Capacitance multiplier for the internal frequency compensation of switching regulator integrated circuits Jan. 17, 1995
5373251 Transmission output amplifier Dec. 13, 1994

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