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Automatic mismatch calibration circuit, method and radio frequency receiver

A calibration circuit, automatic technology, applied in the direction of electrical components, multi-frequency modulation conversion, advanced technology, etc., can solve the problem that the receiving signal-to-noise ratio cannot be improved, and achieve the effect of improving the receiving signal-to-noise ratio

Active Publication Date: 2022-05-31
南京英锐创电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to address the problem that the existing quadrature mismatch compensation adopts the post-compensation method, which cannot improve the receiving signal-to-noise ratio, and provides an automatic mismatch calibration circuit, method and radio frequency receiver

Method used

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  • Automatic mismatch calibration circuit, method and radio frequency receiver
  • Automatic mismatch calibration circuit, method and radio frequency receiver
  • Automatic mismatch calibration circuit, method and radio frequency receiver

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Embodiment Construction

[0043] The serial numbers themselves, such as "first", "second", etc., are used for the parts described herein, not for the objects described.

[0048] The processing circuit 300 is configured to determine a compensation signal according to the first AC signal and the second AC signal.

[0049] It can be understood that the specific circuit structure of the first frequency mixing circuit 100 is not limited, as long as it has the

[0051] It can be understood that the specific circuit structure of the processing circuit 300 is not limited, as long as

[0052] In one embodiment, the processing circuit 300 is based on the first AC signal and the second AC signal

[0055] In one embodiment, the processing circuit 300 can also directly determine by scanning the preset compensation signal table

[0057] LO_I_OUT=[LO_I_IN*cos(PH_COMP)-LO_Q_IN*sin(PH_COMP)]*AM_COMP;

[0058] LO_Q_OUT=LO_Q_IN*cos(PH_COMP)-LO_I_IN*sin(PH_COMP).

[0059] In one embodiment, when the processing circuit 300 acco...

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Abstract

The present application provides an automatic mismatch calibration circuit, method and radio frequency receiver. The automatic mismatch calibration circuit includes: a first frequency mixing circuit, a second frequency mixing circuit, a processing circuit and a pre-distortion compensation circuit. The first mixing circuit is used for receiving the radio frequency signal, and outputting the first AC signal according to the radio frequency signal and the first local oscillator signal. The second frequency mixing circuit is used for receiving the radio frequency signal, and outputting the second AC signal according to the radio frequency signal and the second local oscillator signal. The processing circuit is electrically connected to the first mixing circuit and the second mixing circuit respectively. The processing circuit is used for determining the compensation signal according to the first AC signal and the second AC signal. The compensation signal includes a phase compensation signal and / or an amplitude compensation signal. The pre-distortion compensation circuit is electrically connected to the processing circuit, the first frequency mixing circuit and the second frequency mixing circuit respectively. The pre-distortion compensation circuit is used for respectively adjusting the outputted first local oscillator signal and the second local oscillator signal according to the compensation signal.

Description

Automatic mismatch calibration circuit, method and radio frequency receiver technical field This application relates to the technical field of wireless communication, particularly to automatic mismatch calibration circuit, method and radio frequency reception machine. Background technique In the Internet of Things receiver, there are usually various circuit mismatches, including the DC offset (DC offset) of the IQ two-way. And orthogonal mismatch (IQ mismatch) and so on. These mismatches will affect the receiver's received signal-to-noise ratio, which in turn affects the receiver's demodulation performance. In the current mainstream receiver systems, the mismatch of these RF circuits is calibrated to improve the receiver performance. demodulation performance. However, different calibration methods achieve different calibration effects, and the power consumption is also quite different. [0003] At present, the general quadrature mismatch compensation is implemente...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/12H04B1/16H03D7/16
CPCH04B1/123H04B1/16H03D7/16Y02D30/70
Inventor 熊廷文李曙光徐红如彭仁国
Owner 南京英锐创电子科技有限公司
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