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Method and device for eliminating DC shifting of radio frequency receiver

A radio frequency receiver, DC drift technology, applied in the field of communication, can solve the problems affecting the demodulation performance of the receiver, reduce the dynamic range of the receiver, etc., and achieve the effect of reducing the impact and improving the performance

Active Publication Date: 2012-05-16
ST ERICSSON SEMICON BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the DC drift signal inherent in zero-IF becomes a major drawback of this receiver architecture
The impact of the DC drift signal on the receiver includes saturating the AD converter and reducing the dynamic range of the receiver will affect the demodulation performance of the receiver

Method used

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  • Method and device for eliminating DC shifting of radio frequency receiver
  • Method and device for eliminating DC shifting of radio frequency receiver
  • Method and device for eliminating DC shifting of radio frequency receiver

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] The method for eliminating the DC drift of the radio frequency receiver of the present invention needs to generate and save the DC calibration table of the DC drift signal in the calibration mode of the radio frequency receiver, and the DC calibration table is the corresponding DC drift signal of the radio frequency receiver under different gains. DC calibration table; in the working mode of the RF receiver, the DC drift signal corresponding to different gains can be eliminated by looking up the table.

[0024] First, in the radio frequency receiver calibration mode, a DC calibration table of the DC drift signal is generated and saved, and the DC calibration table is composed of a certain number of cells corresponding to different gain values, such as figure 1 shown, including the following steps:

[0025] Step S100: Preparatory work, s...

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PUM

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Abstract

A radio frequency receiver direct current drift cancellation method, generates and stores direct current calibration tables corresponding to different receiver gains by receiving radiofrequency signals for calibration and passing through the FFT arithmetic, in the calibration mode of the radio frequency receiver; executes direct current drift cancellation to the radiofrequency signals by looking for the stored direct current calibration tables, in the work mode. The invention also discloses a radio frequency receiver direct current drift cancellation apparatus. The invention can be applied toall radio frequency receivers that can produce direct current excursion, the method can furthest decrease the affect of the direct current drift to the performance of the radio frequency receiver.

Description

technical field [0001] The invention relates to a communication technology, in particular to a method and a device for eliminating the DC drift of a radio frequency receiver. Background technique [0002] Zero IF (Zero IF) or direct conversion (Direct-Conversion) receiver has the characteristics of small size, low cost and easy monolithic integration, and is becoming a very competitive structure in radio frequency receivers. Optimizing the design structure and selecting the appropriate manufacturing process to improve the performance and price ratio of the system is the direction pursued by RF engineers. Due to the characteristics of small size, low cost and easy monolithic integration, the zero-IF receiver has become a very competitive structure in the radio frequency receiver and has received extensive attention in the field of wireless communication. [0003] However, the DC drift signal is the main defect of the zero-IF structure receiver. The generation and source of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04B1/30H03D7/00
Inventor 于雷李济水
Owner ST ERICSSON SEMICON BEIJING