Broadband differential low noise amplifier and radio frequency chip

By designing a broadband differential low-noise amplifier including a voltage buffer circuit and a cascorder amplifier circuit, the shortcomings in linearity and performance of low-noise amplifiers in the prior art are solved, and the effects of high linearity, low noise figure and low power consumption are achieved.

CN119675602AInactive Publication Date: 2025-03-21FEIXIANG TECH (WUXI) CO LTD
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Patent Information

Application Number
CN202510168305.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-17
Publication Date
2025-03-21
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

There are shortcomings in linearity and performance of existing broadband differential low-noise amplifiers, and it is difficult to meet multiple performance indicators such as broadband input matching, low noise figure, high gain, high linearity and low power consumption at the same time.

Method used

A broadband differential low noise amplifier including a first signal input terminal, a second signal input terminal, a first amplifier, a second amplifier, a voltage buffer circuit and a casubber amplifier circuit are designed. Through the combination of the voltage buffer circuit and the cascorder amplifier circuit, noise cancellation is achieved, the noise factor of the amplifier is reduced, and common mode noise is suppressed through the differential structure, thereby improving linearity.

Benefits of technology

The high linearity and low noise coefficient of low noise amplifier are realized, which improves the amplification capability of weak signals, reduces power consumption, and meets the requirements of broadband input matching and high performance.

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Abstract

The invention relates to the technical field of wireless communication, and provides a broadband differential low noise amplifier and a radio frequency chip, the broadband differential low noise amplifier comprises a first signal input end, a second signal input end, a first amplifier, a second amplifier, a voltage buffer circuit, a cascode amplification circuit, a first signal output end and a second signal output end; the first amplifier is used for amplifying a first radio frequency signal output by the first signal input end; the second amplifier is used for amplifying a second radio frequency signal output by the second signal input end; a first input end of the cascode amplification circuit is connected to a first signal input end, and a second input end of the cascode amplification circuit is connected to a second signal input end; the first output end of the voltage buffer circuit is connected with the first output end of the cascode amplification circuit, and the second output end of the voltage buffer circuit is connected with the second output end of the cascode amplification circuit. According to the broadband differential low-noise amplifier, thermal noise can be counteracted, and the overall performance of the low-noise amplifier is improved.
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