Low noise amplifier with built-in single-ended input to differential output structure

Abstract

The invention discloses a low noise amplifier with a built-in single-ended input to differential output structure, which relates to the technical field of radio frequency communication. The low noiseamplifier with the built-in single-ended input to differential output structure comprises an input matching circuit and an output load matching circuit, and further comprises a first stage amplification circuit and a second stage amplification circuit which are interconnected, wherein the input matching circuit is connected with the first stage amplification circuit, the first stage amplificationcircuit is connected with the second stage amplification circuit, and the second stage amplification circuit is connected with the output load matching circuit. Such structure has the advantages of being small in area and low in cost and having no need of an external matching circuit, and through verification by actual current sheets, in comparison with the conventional structure with balun at input, sensitivity of the structure provided by the invention is promoted by 2-3dB.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a low-noise amplifier with a built-in single-end input-to-differential output structure. Background technique [0002] With the rapid development of wireless communication technology and CMOS integrated circuit technology, miniaturization, low power consumption, low cost, and high performance of wireless terminals have become an inevitable trend in the development of radio frequency integrated circuits (RFICs). [0003] In RF receiver design, the key to good overall system performance is a superior front end. The low-noise amplifier (LNA) of the first-stage module of the RF receiver is one of the most critical circuits. The LNA needs to have a good noise figure and provide sufficient gain to ensure that the entire receiving system has a minimum NF; at the same time, when the receiving signal When larger, there should be enough linearity to reduce signal dis...

AI Technical Summary

Problems solved by technology

The advantage of this structure is that there is no need for additional matching circuits, and the system is relatively simple; its main disadvantage is that the area of ​​the Balun is very large, which increases the cost of the chip; at the same time, the balance converter is difficult to integrate on-chip, requiring the use of off-chip components, and will introduce 1-3dB loss, which will greatly reduce the sensitivity of the RF receiver (about 1-3dB), reduce the integration and performance of the system, and increase the system cost

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