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Class Information
Number: 455/302
Name: Telecommunications > Receiver or analog modulated signal frequency converter > Noise or interference elimination > Image frequency suppression
Description: Subject matter comprising the combination of frequency modifying or conversion means with significant details of means whereby an unwanted signal appearing at the output of the conversion means, and whose frequency differs from the desired signal by twice the intermediate frequency, is suppressed or eliminated.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7271647 |
Active polyphase filter |
Sep. 18, 2007 |
| 7266357 |
Reduced local oscillator feedthrough quadrature image reject mixer |
Sep. 4, 2007 |
| 7266360 |
Low noise amplifier for wireless communications |
Sep. 4, 2007 |
| 7251466 |
Television receiver including an integrated band selection filter |
Jul. 31, 2007 |
| 7242918 |
Current driven polyphase filters and method of operation |
Jul. 10, 2007 |
| 7236760 |
Tuner for reception of a broadband radio frequency signal |
Jun. 26, 2007 |
| 7190733 |
Memoryless spectrum correction algorithm for non-ideal I/Q demodulators |
Mar. 13, 2007 |
| 7184724 |
System and method for frequency translation using an image reject mixer |
Feb. 27, 2007 |
| 7184737 |
Image-rejection I/Q demodulators |
Feb. 27, 2007 |
| 7177617 |
Method and apparatus for enhancing signal quality within a wireless receiver |
Feb. 13, 2007 |
| 7151917 |
Apparatus and method for deriving a digital image correction factor in a receiver |
Dec. 19, 2006 |
| 7146148 |
Low intermediate frequency type receiver |
Dec. 5, 2006 |
| 7142835 |
Apparatus and method for digital image correction in a receiver |
Nov. 28, 2006 |
| 7130604 |
Harmonic rejection mixer and method of operation |
Oct. 31, 2006 |
| 7130577 |
Low noise converter employed in satellite broadcast reception system and receiver apparatus |
Oct. 31, 2006 |
| 7120406 |
Multiband receiver and method associated therewith |
Oct. 10, 2006 |
| 7116961 |
Image rejection quadratic filter |
Oct. 3, 2006 |
| 7116963 |
Simplified high frequency tuner and tuning method |
Oct. 3, 2006 |
| 7113744 |
Adaptive radio transceiver with a power amplifier |
Sep. 26, 2006 |
| 7092043 |
Fully integrated tuner architecture |
Aug. 15, 2006 |
| 7085548 |
Harmonic mixer |
Aug. 1, 2006 |
| 7085547 |
Mixer circuit and high frequency signal receiver using the same |
Aug. 1, 2006 |
| 7065337 |
Tuner for digital terrestrial broadcast signals |
Jun. 20, 2006 |
| 7050778 |
Direct conversion turner |
May. 23, 2006 |
| 7046979 |
Receiver for rejecting image signal |
May. 16, 2006 |
| 7043220 |
Image-rejection mixer having high linearity and high gain |
May. 9, 2006 |
| 7043221 |
Mixer circuit with image frequency rejection, in particular for an RF receiver with zero or low intermediate frequency |
May. 9, 2006 |
| 7039382 |
DC offset calibration for a radio transceiver mixer |
May. 2, 2006 |
| 7035599 |
Biased phase sweep transmit diversity |
Apr. 25, 2006 |
| 7035613 |
L1/L2 GPS receiver |
Apr. 25, 2006 |
| 6999746 |
Image rejection mixer |
Feb. 14, 2006 |
| 6993310 |
Current driven polyphase filters and method of operation |
Jan. 31, 2006 |
| 6990326 |
Image suppression filter circuit |
Jan. 24, 2006 |
| 6985710 |
Image rejection mixer for broadband signal reception |
Jan. 10, 2006 |
| 6980787 |
Image rejection mixing in wideband applications |
Dec. 27, 2005 |
| 6967619 |
Low noise block |
Nov. 22, 2005 |
| 6959178 |
Tunable upconverter mixer with image rejection |
Oct. 25, 2005 |
| 6952594 |
Dual-mode RF communication device |
Oct. 4, 2005 |
| 6937871 |
Anti-demodulator circuit, filtering device and demodulator circuit |
Aug. 30, 2005 |
| 6922555 |
Phase interpolation receiver for angle modulated RF signals |
Jul. 26, 2005 |
| 6920314 |
Symmetric sweep phase sweep transmit diversity |
Jul. 19, 2005 |
| 6917815 |
Concurrent dual-band receiver architecture |
Jul. 12, 2005 |
| 6901248 |
Frequency converter and radio frequency tuner |
May. 31, 2005 |
| 6892060 |
Fully integrated self-tuned image rejection downconversion system |
May. 10, 2005 |
| 6876842 |
Superheterodyne receivers |
Apr. 5, 2005 |
| 6862323 |
Low pass filters for high dynamic range wideband direct conversion receiver |
Mar. 1, 2005 |
| 6859648 |
Semiconductor integrated circuit device |
Feb. 22, 2005 |
| 6850747 |
Image trap filter |
Feb. 1, 2005 |
| 6850748 |
RF front end with reduced carrier leakage |
Feb. 1, 2005 |
| 6785529 |
System and method for I-Q mismatch compensation in a low IF or zero IF receiver |
Aug. 31, 2004 |
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