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High-sensitivity receiver front-end circuit with impedance mapping function

A high-sensitivity, receiver technology, applied in the direction of electrical components, transmission systems, etc., can solve the problem that the impedance cannot be mapped, and achieve the effect of improving the dynamic range and improving the sensitivity

Inactive Publication Date: 2017-06-23
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impedance between the various modules of the traditional receiver front end cannot be mapped, because the buffer stages are used to isolate the various modules

Method used

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  • High-sensitivity receiver front-end circuit with impedance mapping function
  • High-sensitivity receiver front-end circuit with impedance mapping function
  • High-sensitivity receiver front-end circuit with impedance mapping function

Examples

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Effect test

Embodiment Construction

[0020] Combine below figure 1 , which describes in detail a specific example of implementing a receiver radio frequency front-end circuit with impedance mapping function.

[0021] In the initial state, after the receiver is powered on, the in-phase transimpedance amplifier 6 and the quadrature transimpedance amplifier 7 work normally, and their input impedances respectively exhibit low-pass characteristics. Then by the frequency divider circuit 4, input the non-overlapping clock of four phases to the passive mixer circuit 5, and the input signal is respectively charged by the passive mixer circuit 5 to the in-phase transimpedance amplifier 6 and the quadrature transimpedance amplifier 7 The discharge makes the low-pass impedance characteristic at the low frequency mapped to the radio frequency end with the local oscillator frequency as the center frequency, forming a band-pass characteristic with a high quality factor at the radio frequency. Then, the high-pass impedance char...

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Abstract

The invention, which belongs to the field of the wireless communication technology, particularly relates to a high-sensitivity receiver front-end circuit with an impedance mapping function. The high-sensitivity receiver front-end circuit 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 a quadrature trans-impedance amplifier. With the impedance mapping function of the passive mixer circuit, the impedance with a low-pass characteristic at a low-frequency site is mapped to a radio-frequency side by using a local frequency as a center; and the output terminal of the low-noise trans-conductance amplifier forms abandpass filter with a high-frequency high-quality factor equivalently. The low-noise trans-conductance amplifier provides gains at a first level of a receiver, so that noises of the post-stage circuit can be suppressed effectively and the sensitivity of the whole link can be improved. Moreover, with the active negative feedback of the low-noise trans-conductance amplifier, the impedance is mapped to the input terminal and the out-of-band blocking signal is suppressed by using impedance matching of the input terminal, so that the anti-interference capability of the receiver can be enhanced and the dynamic range of the front end can be extended.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a high-sensitivity receiver radio frequency front-end circuit with impedance mapping function. Background technique [0002] With the advent of the era of smart cities, big data, and artificial intelligence, wireless communication technology will play an increasingly important role and serve as a bridge to realize the interconnection of everything. Mobile communication is moving from the connection between people to the connection between people and things and between things. The Internet of Everything is an inevitable trend. There are a large number of sensing and control link requirements in the Internet of Things world. These connection rates are very low, but they are very sensitive to power consumption and cost, and they are distributed in a wide range and the connection scale is huge. The existing 3G / 4G technology is from The cost and power consu...

Claims

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Application Information

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IPC IPC(8): H04B1/10H04B1/16
Inventor 陈思正马磊闫娜闵昊
Owner FUDAN UNIV
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