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Class Information
Number: 330/303
Name: Amplifiers > With semiconductor amplifying device (e.g., transistor) > Including frequency-responsive means in the signal transmission path > Including an active device in the filter means
Description: Subject matter including a transistor or active diode in the filter network.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8183981 Passive tag with oscillator circuit and frequency identification system utilizing the same May. 22, 2012
8084679 Electronic signal processor Dec. 27, 2011
8081031 Equalization system with stabilized peaking gain for a communication system Dec. 20, 2011
7983649 Low noise figure radiofrequency device Jul. 19, 2011
7961470 Power amplifier Jun. 14, 2011
7932458 Electronic signal processor Apr. 26, 2011
7880549 Transistor including intrinsic harmonic trap Feb. 1, 2011
7738853 Low noise figure radiofrequency device Jun. 15, 2010
7622985 Active compensation filter Nov. 24, 2009
7619472 Noise-shaped blocker-reject amplifier Nov. 17, 2009
7610022 Filter circuit with negative transconductance Oct. 27, 2009
7562581 Wireless sensor platform for harsh environments Jul. 21, 2009
7405621 Apparatus for amplifying differential signal Jul. 29, 2008
7390960 Electronic signal processor Jun. 24, 2008
7313201 Multi-range transconductor and method of operation Dec. 25, 2007
7245186 Bandpass amplifier Jul. 17, 2007
7174147 Bandpass filter with tunable resonator Feb. 6, 2007
7138873 Filter circuit providing low distortion and enhanced flexibility to obtain variable gain amplification Nov. 21, 2006
7139544 Direct down-conversion receiver with transconductance-capacitor filter and method Nov. 21, 2006
7123082 Variable time constant circuit and filter circuit using the same Oct. 17, 2006
7039202 Microphone unit May. 2, 2006
7009446 Active filter circuit with reduced noise Mar. 7, 2006
6977541 Variable time constant circuit and filter circuit using the same Dec. 20, 2005
6975848 Method and apparatus for DC offset removal in a radio frequency communication channel Dec. 13, 2005
6967606 Loop filter for a continuous time sigma delta analog to digital converter Nov. 22, 2005
6791401 Continuous-time analog filter having controllable gain characteristics Sep. 14, 2004
6747531 Circuit and method for input side impedance matching of a power amplifier in an electronic device Jun. 8, 2004
6744306 Filter circuit Jun. 1, 2004
6731174 Radio frequency power amplifier device May. 4, 2004
6724263 High-frequency power amplifier Apr. 20, 2004
6720817 All NPN class-AB log-domain integrator with supporting input and output circuitry for low-voltage and high-frequency continuous-time filtering Apr. 13, 2004
6703682 High sheet MOS resistor method and apparatus Mar. 9, 2004
6700792 High-frequency composite component and portable wireless device incorporating the component Mar. 2, 2004
6700445 Filter circuits based on trans-conductor circuits Mar. 2, 2004
6664854 Base band filter including a semiconductor integrated circuit Dec. 16, 2003
6624704 High speed high current gain operational amplifier Sep. 23, 2003
6566949 Highly linear high-speed transconductance amplifier for Gm-C filters May. 20, 2003
6556078 Integrated low-corner frequency high pass filter circuit Apr. 29, 2003
6549076 High-output amplifier Apr. 15, 2003
6516069 Microphone filter and microphone unit Feb. 4, 2003
6504432 Tunable, dynamic, and self-biasing differential amplifier and application thereof Jan. 7, 2003
6492876 Low power analog equalizer with variable op-amp gain Dec. 10, 2002
6476676 Semiconductor integrated circuit Nov. 5, 2002
6469582 Voltage tunable active inductorless filter Oct. 22, 2002
6426676 Compact differential transconductance amplifier and a method of operation thereof Jul. 30, 2002
6362691 Voltage tunable active inductorless filter Mar. 26, 2002
6356143 Method and apparatus for filtering radio frequency signals Mar. 12, 2002
6346860 Resonator Feb. 12, 2002
6331802 Linear gain control amplifier Dec. 18, 2001
6327465 Voltage tunable active inductorless filter Dec. 4, 2001

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