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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 |
| 7606549 |
Selective channel tuner and tuning method |
Oct. 20, 2009 |
| 7603098 |
Programmable IF frequency filter for enabling a compromise between DC offset rejection and image rejection |
Oct. 13, 2009 |
| 7583947 |
Method and system for single sideband mixing receiver architecture for improving signal quality |
Sep. 1, 2009 |
| 7580483 |
Trimming of local oscillation in an integrated circuit radio |
Aug. 25, 2009 |
| 7580692 |
Mobile wireless communications device having low-IF receiver circuitry that adapts to radio environment |
Aug. 25, 2009 |
| 7567783 |
I/Q mismatch calibration of direct conversion transceivers using the OFDM short training sequence |
Jul. 28, 2009 |
| 7558546 |
Selectable high-side/low-side mix for high intermediate frequency (IF) receivers |
Jul. 7, 2009 |
| 7555076 |
Modular device for multiple reception of a modulated signal |
Jun. 30, 2009 |
| 7555281 |
RF receiving apparatus |
Jun. 30, 2009 |
| 7546109 |
Gilbert mixers with improved isolation and methods therefor |
Jun. 9, 2009 |
| 7545857 |
Receiver architecture employing low intermediate frequency and complex filtering |
Jun. 9, 2009 |
| 7525481 |
Performance of a receiver in interfering conditions |
Apr. 28, 2009 |
| 7522899 |
Image rejection scheme for receivers |
Apr. 21, 2009 |
| 7519348 |
Harmonic suppression mixer and tuner |
Apr. 14, 2009 |
| 7519349 |
Transceiver development in VHF/UHF/GSM/GPS/bluetooth/cordless telephones |
Apr. 14, 2009 |
| 7509106 |
Test signal generation circuit, and reception circuit |
Mar. 24, 2009 |
| 7509110 |
High-order harmonic rejection mixer using multiple LO phases |
Mar. 24, 2009 |
| 7493141 |
Common radio architecture for multi-mode multi-band applications |
Feb. 17, 2009 |
| 7493097 |
High dynamic range compact mixer output stage for a wireless receiver |
Feb. 17, 2009 |
| 7480496 |
High-frequency receiver and portable device using the same |
Jan. 20, 2009 |
| 7466973 |
Single conversion tuner |
Dec. 16, 2008 |
| 7463862 |
Methods and apparatus to integrate image rejection into quadrature mixers |
Dec. 9, 2008 |
| 7460832 |
Methods and apparatuses for minimizing co-channel interference |
Dec. 2, 2008 |
| 7456740 |
Detector device |
Nov. 25, 2008 |
| 7454185 |
Wideband I/Q signal generation device |
Nov. 18, 2008 |
| 7450923 |
Method and system for controlling carrier leakage in a direct conversion wireless device |
Nov. 11, 2008 |
| 7450924 |
Interference cancellation and receive diversity for single-valued modulation receivers |
Nov. 11, 2008 |
| 7423699 |
Fully integrated tuner architecture |
Sep. 9, 2008 |
| 7424281 |
Image-rejection mixers having high linearity and high gain and RF circuits using the same |
Sep. 9, 2008 |
| 7412209 |
Shifted channel characteristics for mitigating co-channel interference |
Aug. 12, 2008 |
| 7400873 |
Method and system for image rejection by using post mixer I/Q equalization |
Jul. 15, 2008 |
| 7379725 |
LNA gain adjustment in an RF receiver to compensate for intermodulation interference |
May. 27, 2008 |
| 7373124 |
Receiver |
May. 13, 2008 |
| 7373131 |
Signal processing method and signal processing apparatus |
May. 13, 2008 |
| 7369834 |
Impedance-matched IQ network for an image rejection circuit |
May. 6, 2008 |
| 7369835 |
Image rejection mixer providing precision image rejection |
May. 6, 2008 |
| 7362826 |
Receiver including an oscillation circuit for generating an image rejection calibration tone |
Apr. 22, 2008 |
| 7362814 |
Memoryless spectrum correction algorithm for non-ideal I/Q demodulators |
Apr. 22, 2008 |
| 7346324 |
Grounded-emitter circuit, and high-frequency receiver and high-frequency transmitter using the same |
Mar. 18, 2008 |
| 7336940 |
Frequency conversion techniques using antiphase mixing |
Feb. 26, 2008 |
| 7333791 |
Use of an image reject mixer in a forward data channel tuner |
Feb. 19, 2008 |
| 7308243 |
Mixer arrangement and method for mixing signals |
Dec. 11, 2007 |
| 7302248 |
Harmonic image-reject converter |
Nov. 27, 2007 |
| 7299020 |
Tunable multi-band receiver by on-chip selectable filtering |
Nov. 20, 2007 |
| 7299027 |
MIMO receiver and MIMO reception method for selection of MIMO separation and channel variation compensation |
Nov. 20, 2007 |
| 7292836 |
Direct conversion receiver |
Nov. 6, 2007 |
| 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 |
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