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A Gain-Variable Direct Downconversion Mixer for Navigation RF Front-End

A technology of radio frequency front-end and mixer, which is applied in the field of variable-gain direct down-conversion mixer, and can solve the problem that the passive structure gain and area cannot meet the index requirements, etc.

Active Publication Date: 2017-10-17
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the gain and area of ​​the passive structure are difficult to meet the index requirements, so the active mixer based on the Gilbert (Gilbert) unit is the mainstream structure today

Method used

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  • A Gain-Variable Direct Downconversion Mixer for Navigation RF Front-End
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  • A Gain-Variable Direct Downconversion Mixer for Navigation RF Front-End

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Embodiment Construction

[0047] 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.

[0048] Such as figure 1 Shown, a kind of gain variable direct down-conversion mixer for navigation radio frequency front-end, is characterized in that, comprises:

[0049] The I / Q quadrature signal module is used to generate quadrature signals;

[0050] A mixing module, configured to mix the quadrature signal and the radio frequency signal input to the mixing module to obtain a primary intermediate frequency signal;

[0051] A passive polyphase filter module, used to suppress the image signal in the intermediate frequency signal to obtain a secondary intermediate frequency signal;

[0052] The summing module is configured to sum the intermediate frequency output signals and compensate the gain to obtain the final intermediate frequency signal.

[0053...

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Abstract

The present invention provides a gain-variable direct down-conversion mixer for a navigation radio frequency front end, comprising: an I / Q quadrature signal module for generating quadrature signals; a frequency mixing module for combining the quadrature The signal is mixed with the radio frequency signal input to the mixing module to obtain a primary intermediate frequency signal; the passive polyphase filter module is used to suppress the image signal in the intermediate frequency signal to obtain a secondary intermediate frequency signal; The above intermediate frequency output signals are summed and the gain is compensated to obtain the final intermediate frequency signal. The mixer of the invention can convert the high-frequency input signal into an intermediate frequency signal, also suppresses the image of the intermediate frequency signal, and performs gain compensation for the difference loss caused by the image suppression.

Description

technical field [0001] The invention relates to the field of wireless communication, and provides a gain-variable direct down-conversion mixer used for a navigation radio frequency front end. Background technique [0002] In order to realize the conversion of high-frequency signals to intermediate-frequency signals, the mixer is an indispensable unit. At present, there are two traditional solutions in the industry: one is an active mixer, and the other is a passive mixing structure. However, the gain and area of ​​the passive structure are difficult to meet the index requirements, so the active mixer based on the Gilbert (Gilbert) unit is the mainstream structure today. With the rapid development of wireless communication systems, my country's Beidou navigation is becoming more and more perfect, so it is urgent to provide a direct down-conversion mixer that can be applied to satellite navigation systems such as Beidou and GPS, and can have variable gain and image rejection ....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03D7/12
Inventor 朱樟明张腾飞刘帘曦杨银堂
Owner XIDIAN UNIV