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UHF RF receiving front-end circuit

A technology of radio frequency reception and front-end circuit, which is applied in the field of ultra-high frequency radio frequency, can solve the problems of linearity to be improved, and achieve the effects of strong common-mode signal and even-order harmonic suppression ability, high linearity, and adjustable working frequency

Inactive Publication Date: 2017-06-20
张凤军
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the design of UHF, through the improvement of the transmitter and receiver circuit structure, the corresponding performance can be improved, but at the same time it is at the cost of reducing some performance, such as improving the noise performance, but reducing the linearity. improve

Method used

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  • UHF RF receiving front-end circuit

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with drawings and embodiments.

[0018] like figure 1 , the low noise amplifier is mainly composed of cascode differential pair tubes composed of M4-M7 tubes to achieve amplification. The cascode structure can greatly improve the isolation of each port signal. In order to improve the linearity of the LNA, a second-order intermodulation current injection method is used to improve the linearity. M1 and M2 form a second-order intermodulation injection structure. In a pair of differential pair tubes, M3 is mainly generated by the nonlinear I-V characteristics of active devices. There are four sets of switched capacitors connected to the output of the LNA. Each set of switched capacitors consists of a capacitor and an NMOS tube, which are B0, B1, B2 and B3. By controlling the NMOS tube to turn on and off, different capacitances can be obtained. Value, that is, the adjustment of the capacitance is realize...

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Abstract

An ultra-high frequency radio frequency receiving front-end circuit is composed of a new low-noise amplifier and a new 900MHz down-mixer circuit. The proposed LNA adopts a differential input and output circuit structure, which has strong common-mode signal and even-order harmonic suppression capabilities. It uses a second-order intermodulation current injection structure at the input end to eliminate the third-order intermodulation current, thereby improving The linearity of the mixer; the MOS is connected to the output of the LNA in the form of a capacitor, and the working frequency can be adjusted through the final realization; the proposed mixer adopts a differential input and output circuit structure, which has a strong common-mode signal and Even-order harmonic suppression ability, the circuit structure is strictly symmetrical, a second-order intermodulation current injection structure is used at the input end of the circuit to eliminate the third-order intermodulation current, and a dynamic current injection structure is used at the output end to improve the noise characteristics of the mixer .

Description

[0001] Technical field [0002] The invention relates to an ultra-high frequency radio frequency receiving front-end circuit, which is suitable for the field of ultra-high frequency radio frequency. Background technique [0003] The UHF RFID technology in various frequency bands is developing very rapidly, and the UHF RFID system working in the 840-'960MHz frequency band is gradually following the trend of low power consumption, low cost, and high efficiency. And the trend of high circulation is moving forward rapidly. In the UHF RFID system, the design of the RF front-end circuit in the UHF reader becomes very important. [0004] The UHF radio frequency identification reader is composed of a transmitter and a receiver, and most of the readers are realized by discrete components, and its circuit structure is complicated and consumes a lot of power. The research status of the UHF reader is summarized as follows: the reader works in the listen mode and the talk mode, and high ...

Claims

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Application Information

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IPC IPC(8): H04B1/12H04B1/10
CPCH04B1/123H04B1/1036
Inventor 张凤军
Owner 张凤军