Fully-integrated anti-blocking radio frequency receiving front-end architecture

A radio frequency receiving, fully integrated technology, applied in electrical components, transmission systems, etc., to achieve the effect of simple circuit structure, saving circuit area and power consumption, and good isolation

Active Publication Date: 2015-05-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] technical problem: The present invention proposes a fully integrated anti-blocking radio frequency receiving front-end architecture that solves the impact of blocking signals on the receiver in the frequency domain environment

Method used

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  • Fully-integrated anti-blocking radio frequency receiving front-end architecture
  • Fully-integrated anti-blocking radio frequency receiving front-end architecture

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0017] like figure 1 As shown, the fully integrated anti-blocking RF receiving front-end architecture proposed by the present invention is a feedforward structure, which is connected by a RF blocking signal filter stage and a down-mixing stage. The RF blocking signal filtering stage filters out the RF blocking signal and retains the RF For useful signals, the down-mixing stage converts the useful RF signals into intermediate frequency useful signals. The RF blocking signal filter stage includes a first low noise amplifier LNA1, a second low noise amplifier LNA2, a subtraction circuit S and a load stage. The main branch is composed of the first low-noise amplifier LNA1, and the feed-forward branch is composed of the second low-noise amplifier LNA2, the subtraction operation circuit S and the load stage. The load stage is formed by connecting the second passi...

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Abstract

The invention discloses a fully-integrated anti-blocking radio frequency receiving front-end architecture. The fully-integrated anti-blocking radio frequency receiving front-end architecture comprises a blocking signal filtering stage and a down mixing stage. The blocking signal filtering stage is a feed-forward structure, and a main branch and a feed-forward branch use low-noise amplifiers with the same circuit structures to realize matching. The feed-forward branch uses the impedance moving feature of a passive mixer at the frequency domain, a band elimination filter is generated at a radio frequency local oscillator to filter useful signals, and then a usable radio frequency signal is obtained through subtracting the obtained blocking signal from the blocking signal of the main branch. Because the blocking signal is directly filtered after two low-noise amplifiers, the influence on the other circuit is avoided, and the other non-ideal factors are avoided. The down mixing is realized to obtain a usable middle-frequency signal through connecting the passive mixer.

Description

technical field [0001] The invention belongs to the field of wireless communication receivers, and relates to a fully integrated anti-blocking radio frequency receiving front-end architecture. Background technique [0002] Now the wireless communication technology is widely used, but due to the limited frequency spectrum resources, there are a large number of users in the public frequency band. For example, 2.4GHz is the ISM frequency band shared by all countries, so wireless networks such as wireless LAN, Bluetooth, and ZigBee all work on the 2.4GHz frequency band. A strong transmit signal from a transmitter is a blocking signal to other receivers on nearby channels in the desired frequency band. Large-scale blocking signals will make the working state of the transistor in the receiver deviate, resulting in a decrease in the gain of the receiver, deterioration of performance such as noise figure and linearity, and even make the receiver unable to work. In order to elimi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16
CPCH04B1/16
Inventor 吴建辉程超于天骥姚红燕程康陈超李红黄成
Owner SOUTHEAST UNIV
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