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Final amplifier with high three-order intermodulation distortion cancellation for receiver and intermodulation distortion cancellation method

A final-stage amplifier, third-order intermodulation technology, which is applied to power amplifiers, improved amplifiers to reduce nonlinear distortion, electrical components, etc., can solve the problems of limited third-order intermodulation of the final amplifier of spaceborne microwave receivers, etc. Achieve low power consumption, improve third-order intermodulation suppression, and low power

Active Publication Date: 2015-08-12
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0004] The technical problem solved by the present invention is: to overcome the deficiencies in the prior art, provide a receiver final stage amplifier with high third-order intermodulation suppression and an intermodulation suppression method, and focus on solving the third-order intermodulation of the existing satellite-borne microwave receiver final stage amplifier restricted question

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  • Final amplifier with high three-order intermodulation distortion cancellation for receiver and intermodulation distortion cancellation method
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  • Final amplifier with high three-order intermodulation distortion cancellation for receiver and intermodulation distortion cancellation method

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Embodiment Construction

[0031] The basic idea of ​​the present invention is to provide a receiver final stage amplifier with high third-order intermodulation suppression and an intermodulation suppression method, aiming at the problem of limited third-order intermodulation of the final stage amplifier of the existing satellite-borne microwave receiver. Realized by 90° branch line bridge, first 50Ω load resistor, first amplifier, second amplifier, attenuator, phase shifter, 90° coupler and second 50Ω load resistor. The specific method is to input the dual-tone signal to the input end of the 90° branch line bridge, the isolated end of the 90° branch line bridge is grounded through the first 50 ohm load resistor, and the two-way amplitudes of the output end of the 90° branch line bridge are equal. The two-tone signals with a phase difference of 90° are respectively input to the first amplifier and the second amplifier for amplification, the output signal of the first amplifier is input to the second inpu...

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Abstract

The invention discloses a final amplifier with high three-order intermodulation distortion cancellation for a receiver and an intermodulation distortion cancellation method. The final amplifier comprises a 90-degree branch line bridge, a first 50-ohm load resistor, a first amplifier, a second amplifier, an attenuator, a phase shifter, a 90-degree coupler and a second 50-ohm load resistor. Through implementation of the final amplifier, the second amplifier is added on the basis of a conventional single-stage intermediate power amplifier (first amplifier), the second amplifier is a small signal amplifier, a 1-dB compression point is lower and is 10-12 dBm, and an output signal of the second amplifier has the characteristics of lower main carrier power and higher three-order intermodulation distortion power. The two amplifiers are cascaded at the input end through the 90-degree branch line bridge and are cascaded at the output end through the 90-degree coupler, and the amplitude and the phase of a three-order intermodulation distortion signal output by the second amplifier are adjusted through the attenuator and the phase shifter, so that three-order intermodulation distortion components produced by the two amplifiers are inverse at a synthetic end at constant amplitude, and thus power cancellation is realized.

Description

technical field [0001] The invention relates to a receiver final-stage amplifier with high third-order intermodulation suppression and an intermodulation suppression method, belonging to the technical field of microwave circuits. Background technique [0002] With the continuous development of satellite technology and the continuous increase of satellite communication capacity, the system puts forward higher and higher requirements for the linearity of satellite-borne microwave receivers. Specifically, the satellite-borne microwave receiver is required to have good third-order intermodulation suppression performance at a relatively high input level. Usually, the third-order intermodulation suppression performance of the whole receiver is mainly determined by the third-order intermodulation suppression performance of the final stage amplifier of the receiver. [0003] The third-order intermodulation suppression performance of spaceborne microwave receiver is related to the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/20H03F1/32H04B1/16
Inventor 张波朱正贤邓向科邵小亮徐鑫王毅
Owner XIAN INSTITUE OF SPACE RADIO TECH
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