HIGH-SENSITIVITY RECEIVER FRONT-END CIRCUIT HAVING IMPEDANCE MAPPING FUNCTION

Title:

HIGH-SENSITIVITY RECEIVER FRONT-END CIRCUIT HAVING IMPEDANCE MAPPING FUNCTION

Document Type and Number:

WIPO Patent Application WO/2018/188329

Kind Code:

A1

Abstract:

The present invention belongs to the technical field of wireless communication and specifically relates to a high-sensitivity receiver radio frequency front-end circuit having an impedance mapping function. The circuit according to the present invention comprises: a linearity compensation circuit, a low-noise trans-conductance amplifier circuit, an active negative feedback circuit, a divider circuit, a passive mixer circuit, an in-phase trans-impedance amplifier and an orthogonal trans-impedance amplifier. By using the impedance mapping function of a passive mixer, the present circuit maps impedance having a low-pass characteristic at a low-frequency site to a radio frequency end by using a local frequency as the center; and the output end of the low-noise trans-conductance amplifier equivalently forms a band pass filter having a high-frequency high-quality factor. The low-noise trans-conductance amplifier provides gains at a first level of a receiver, so that noises of the post-stage circuit may be suppressed effectively, thus contributing to the sensitivity of the whole link being improved. Moreover, by using the active negative feedback of the low-noise trans-conductance amplifier, impedance is mapped to the input end and an out-of-band blocking signal is suppressed by using impedance matching of the input end, so that the anti-interference capability of a receiver may be enhanced, and the dynamic range of the entire front end may be increased.

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Inventors:

CHEN SIZHENG (CN)
MA LEI (CN)
YAN NA (CN)
MIN HAO (CN)

Application Number:

PCT/CN2017/110346

Publication Date:

October 18, 2018

Filing Date:

November 10, 2017

Export Citation:

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Assignee:

UNIV FUDAN (CN)

International Classes:

H04B1/10; H04B1/16

Foreign References:

CN106888028A	2017-06-23
CN106533475A	2017-03-22
CN102158179A	2011-08-17
CN101867346A	2010-10-20
US20060199562A1	2006-09-07
US9331651B1	2016-05-03

Attorney, Agent or Firm:

SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)

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