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Down-conversion mixer

A technology of mixer and radio frequency current, applied in the direction of modulation conversion balance device, electrical components, modulation transfer, etc., can solve difficult problems such as high gain, low noise, high linearity, performance loss, etc., to improve conversion gain and Linearity, low power consumption, and the effect of improving conversion gain

Inactive Publication Date: 2017-09-22
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

It can be seen that in the usual mixer design, it is difficult to achieve high gain, low noise and high linearity at the same time, and the corresponding compensation measures will bring performance loss in other aspects

Method used

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  • Down-conversion mixer
  • Down-conversion mixer
  • Down-conversion mixer

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Embodiment Construction

[0039] The embodiment of the present invention solves the technical problem in the prior art that the mixer cannot simultaneously have excellent gain and excellent linearity performance by providing a down-conversion mixer. In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0040]An embodiment of the present invention provides a down-conversion mixer structure, including: an input transconductance unit, a switch unit, a current injection unit, a cross-coupled active load unit, and a tail current source unit. The tail current source unit provides the input transconductance unit with DC bias, the RF input signal is amplified by the input transconductance unit, the signal is enhanced through the cross-coupled PMOS transistor and LC resonant circuit, output to the switch unit, and mixed with the local oscillator sig...

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Abstract

The invention relates to a down-conversion mixer. The down-conversion mixer comprises an input trans-conductance unit, a switching unit, a current injection unit, a cross-coupled active load unit and a tail current source unit, wherein the tail current source unit provides DC bias for the input trans-conductance unit based on a current mirror structure; the input trans-conductance unit converts an RF voltage signal into an RF current signal, improves a circuit equivalent trans-conductance value to increase gain by utilizing a cross-coupled trans-conductance enhancement technology, and additionally arranges an LC resonant loop between two branch circuits of the input trans-conductance unit to reduce flicker noise; the switching unit modulates the RF current signal output by the input trans-conductance unit by means of current commutation; the cross-coupled active load unit takes a PMOS tube cross-coupled pair as output load; and a differential IF output voltage signal is output between the switching unit and the cross-coupled active load unit.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a down-conversion mixer. Background technique [0002] In the design of the radio frequency receiver, the mixer is located after the low noise amplifier, and the signal amplified by the low noise amplifier is down-converted to generate a lower frequency intermediate frequency signal for subsequent baseband processing. The design of the mixer should comprehensively consider the indicators such as noise figure, conversion gain, linearity, port isolation and power consumption. In an RF receiver, the performance of the mixer affects the performance of the entire system. The noise figure of the mixer determines the receiver system's requirements for the gain and noise of the low-noise amplifier, and has a significant impact on the sensitivity of the receiver system. A mixer with high conversion gain can improve the noise of the system, and the linearity of the mixer is good. Ba...

Claims

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Application Information

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IPC IPC(8): H03D7/14
CPCH03D7/1441
Inventor 张为赵启越
Owner TIANJIN UNIV
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