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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 7139544 |
Direct down-conversion receiver with transconductance-capacitor filter and method |
Nov. 21, 2006 |
| 7138873 |
Filter circuit providing low distortion and enhanced flexibility to obtain variable gain amplification |
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 |
| 6700445 |
Filter circuits based on trans-conductor circuits |
Mar. 2, 2004 |
| 6700792 |
High-frequency composite component and portable wireless device incorporating the component |
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 |
| 6300669 |
Semiconductor integrated circuit device and method of designing same |
Oct. 9, 2001 |
| 6288611 |
Apparatus and method to trim a programmable low-frequency monolithic high-pass filter |
Sep. 11, 2001 |
| 6255905 |
Active filter circuit having a T-network input arrangement that provides a high input impedance |
Jul. 3, 2001 |
| 6239653 |
Biquadratic basic cell for programmable analog time-continuous filter |
May. 29, 2001 |
| 6239654 |
Filter circuit |
May. 29, 2001 |
| 6232645 |
Noise decoupling for semiconductor device with BiCMOS-type substrate |
May. 15, 2001 |
| 6232840 |
Transistor amplifier having reduced parasitic oscillations |
May. 15, 2001 |
| 6232841 |
Integrated tunable high efficiency power amplifier |
May. 15, 2001 |
| 6194959 |
Active filter circuit |
Feb. 27, 2001 |
| 6188272 |
Filter circuit |
Feb. 13, 2001 |
| 6177837 |
Active low-pass filter |
Jan. 23, 2001 |
| 6172569 |
Transconductance filter control system |
Jan. 9, 2001 |
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