Intermodulation offset device for passive device

A technology for passive devices and signal cancellation, applied in electrical components, power amplifiers, improved amplifiers to reduce nonlinear distortion, etc., can solve the problem of large amplitude attenuation and phase change of transmission signals, and does not consider the difference in intermodulation value of nonlinear units , pass rate is not easy to control and other problems, to achieve the effect of small size, easy control of pass rate and low cost
CN103199808AActive Publication Date: 2013-07-10WUHAN FINGU ELECTRONICS TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN FINGU ELECTRONICS TECH
Publication Date
2013-07-10

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Abstract

The invention relates to an intermodulation offset device for a passive device. The intermodulation offset device comprises a power coupler, an adjustment module and a nonlinear device, wherein an input and an output of the intermodulation offset device share one port; the power coupler couples a transmission signal from the passive device through the input / output port; the adjustment module and the nonlinear module are respectively used for primarily processing the coupled transmission signal; the primarily-processed signal is reflected at the tail end of the intermodulation offset device and then is secondarily processed, so that a power signal containing a second intermodulation offset signal is generated in the secondarily-processed signal; the second intermodulation offset signal in the power signal has the same frequency and level and opposite phase with an intermodulation signal of the transmission signal in the passive device; and the power signal is overlapped with the transmission signal in the passive device and is outputted to the passive device through the input / output port. According to the intermodulation offset device disclosed by the invention, the intermodulation signal of the passive device can be offset in the whole work frequency range.
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Description

technical field

[0001] The present invention relates to the field of communication. In particular, the present invention relates to an intermodulation cancellation device for passive devices. Background technique

[0002] Passive components such as transmit filters, duplexers, combiners, and power splitters are widely used in antenna feeder systems. The antenna feed system is often used to share the antenna after combining the receiving path and the transmitting path. In the antenna feeder system, the signal power of the transmission path is much greater than that of the reception path, and the transmission signal will generate a large level of intermodulation signal through the passive nonlinear device. At the antenna end, the intermodulation signal falls into the receiving channel, forming intermodulation interference, which makes the antenna feeder system unable to work normally. Therefore, when passive devices are working, the passive intermodulation signal level gene...

Claims

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