High-linearity low-noise amplifier

A low-noise amplifier and high linearity technology, which is applied in the direction of improving the amplifier to reduce the impact of noise, improving the amplifier to reduce nonlinear distortion, etc., can solve the problem of affecting the dynamic range of the receiving link, unable to filter the carrier signal, reducing Sensitivity and other issues, to achieve the effect of reducing noise figure, low power consumption, and increasing gain

Active Publication Date: 2013-08-14
NANJING UNIV OF POSTS & TELECOMM INST AT NANJING CO LTD
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Problems solved by technology

And because most of the communication systems receive and transmit signals at the same carrier frequency, it is impossible to filter out the leaked carrier signal through a radio freque...

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Embodiment Construction

[0025] A high-linearity low-noise amplifier of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] refer to figure 2 A high-linearity low-noise amplifier provided by the present invention is composed of a differential amplifier and a negative feedback circuit, and the differential amplifier adopts a typical fully differential circuit and a cross-coupling capacitor structure. The amplifier circuit has positive and negative two-way input and output, and the two-way circuits are completely symmetrical in design. RF op is the positive output of the differential amplifier; RF on It is the negative output terminal of the differential amplifier.

[0027] The typical fully differential circuit includes the first NMOS transistor to the fifth NMOS transistor, the seventh PMOS transistor PM7, the eighth PMOS transistor PM8, the first to the fourth inductors, the first capacitor C1, the second capacitor C2, and the third resist...

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Abstract

The invention provides a high-linearity low-noise amplifier of the front end of an ultrahigh-frequency RFID (radio frequency identification) receiver. The amplifier detects two common levels from two differential output ends of a full-differential amplifier through a common-feedback circuit, bias current of the amplifier is adjusted validly and feedback voltage is outputted to a grid of a tail current source, and accordingly, overdrive voltage of the tail current source is increased, input current is increased and linearity is improved. Meanwhile, the problem of non-linear distortion caused by instability of the output common levels is solved. In addition, a coupling capacitor is crossed interstagely to increase power grain, and noise figure is reduced to improve noise performance. The high-linearity low-noise amplifier has the advantages of low noise figure, low power consumption, and high linearity, and solves the problem of carrier leak in ultrahigh-frequency RFID receivers and zero intermediate frequency receivers, and linearity of the low-noise amplifier is improved, so that weak available signals can be amplified linearly and distortionlessly in the process of receiving block signals.

Description

technical field [0001] The invention belongs to the field of radio frequency integrated circuit design, in particular to a high-linearity low-noise amplifier. Background technique [0002] In recent years, wireless communication technology has developed rapidly and plays an increasingly important role in social life. The development of wireless communication puts forward higher requirements on the front-end circuit of the transceiver. [0003] Low Noise Amplifier LNA (Low Noise Amplifier) ​​is the first stage of the receiver front end, and its performance directly affects the performance of the entire receiver system. The overall noise figure of the system depends on the noise performance of the first stage LNA. In addition to the overall noise of the system, whether it is transmitting or receiving data, the antenna will continue to transmit a large carrier signal. The carrier signal leaks into the front end of the receiver through a circulator or a directional coupler, and...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F1/32
Inventor 张长春高申俊方玉明郭宇锋刘蕾蕾李卫
Owner NANJING UNIV OF POSTS & TELECOMM INST AT NANJING CO LTD
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