Device for improving linearity degree of feedforward amplifier

Abstract

The invention discloses a device for improving the linearity degree of a feedforward amplifier, and belongs to the technical field of wireless communication. The device comprises a main signal amplifier, a main signal counteracting loop, a distortion signal counteracting loop and a distortion signal re-counteracting loop. The device has the advantages that a main signal amplifier in an existing feedforward structure is achieved through a balance amplifier, the main signal amplifier good in linearity degree is obtained, and therefore the linearity degree of the feedforward structure amplifier is improved; the distortion signal re-counteracting loop is additionally arranged behind the distortion signal counteracting loop, distortion signals generated by the main signal amplifier are further counteracted so that only fundamental wave signals are contained at the output end of the feedforward structure amplifier, and a second-order intermodulation cutoff point and a third-order intermodulation cutoff point of the amplifier can be improved more effectively. The linearity degree of the feedforward amplifier is effectively improved through the second-order intermodulation cutoff point and the third-order intermodulation cutoff point, and meanwhile the advantages of wide band and low noise of the amplifier are maintained.

Description

technical field [0001] The invention relates to improving the linearity of the feedforward amplifier. The method can effectively improve the linearity of the feedforward amplifier while maintaining the advantages of wide frequency band and low noise, and belongs to the technical field of wireless communication. Background technique [0002] With the rapid development of wireless communication technology, people put forward higher and higher requirements for radio frequency receivers of wireless communication systems, such as low power consumption, low noise, large dynamic range, high sensitivity and high linearity, etc.; and the receiving system The bandwidth, noise performance and linearity of the receiver mainly depend on the bandwidth, noise performance and linearity of the front-end amplifier of the receiver, such as figure 1 shown. Therefore, improving the linearity of the feedforward amplifier at the front end of the receiver can effectively improve the linearity of ...

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Problems solved by technology

[0004] The present invention aims at the problem that the feedforward structure in the feedforward technology cannot realize the ideal offset of the two loops. The present invention provides a method to improve the linearity of the feedforward amplifier The device overcomes the defects of the prior art, realizes the ideal cancellation of the two loops, and more effectively improves the second-order intercept point and the third-order intercept point of the feedforward amplifier to meet the requirements for the linearity of the amplifier. higher requirements

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