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Correcting device and method for direct current off-set outputted by equipment

A DC offset and equipment technology, applied in the direction of DC level restoration device/bias distortion correction, baseband system components, etc., can solve the problems of difficult circuit design, long response time, large chip area, etc., to reduce the DC residual amount , improve performance, prevent the effect of DC offset saturation

Active Publication Date: 2008-10-15
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the embodiments of the present invention is to provide a device and method for calibrating the DC offset output by the device, so as to solve the problems of the existing technical solutions that require a large chip area, long response time, and bring difficulties to circuit design. question

Method used

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  • Correcting device and method for direct current off-set outputted by equipment
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  • Correcting device and method for direct current off-set outputted by equipment

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Embodiment Construction

[0022] In Embodiment 1 of the present invention, the calibration device is connected to the input terminal and the output terminal of the device to be calibrated to form a loop with the device to be calibrated. The calibration device obtains the output signal of the device to be calibrated from the output terminal of the device to be calibrated, calculates a DC component from the output signal, and calculates a corresponding analog signal according to the magnitude or sign of the DC component, The analog signal is fed back to the input terminal of the device to be calibrated, and the analog signal is used to offset the DC offset of the output of the device to be calibrated.

[0023] When the device to be calibrated is initially calibrated, the successive approximation algorithm is used to obtain the average value of the DC offset output by the device to be calibrated in various gain modes, and the average value of the DC offset is stored in different gain addresses. When perf...

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Abstract

The invention provides a device and method for calibrating DC offset output by a device. The device is connected with an input end and an output end of the device needing calibrating to form a loop. The device obtains output signals of the device needing calibrating from the output end of the device needing calibrating, calculates DC components from the output signals, calculates corresponding analog signals according to the DC components and feeds the analog signals back to the input end of the device needing calibrating. The analog signals are used for offsetting the DC offset output by the device needing calibrating. The method and device of the invention can effectively reduce the DC residual volume of the device needing calibrating, prevent the analog transmission paths of the device needing calibrating from being saturated by the DC offset and ensure that the device needing calibrating obtains comparatively good demodulation performance.

Description

technical field [0001] The invention relates to the technical field of electronic applications, in particular to a device and method for calibrating the DC offset output by equipment. Background technique [0002] The structure of a global system for mobile communications (GSM, Global System Mobile) zero-IF receiver is as follows figure 1 As shown, in the receiver channel, there is a relatively large DC offset (DC offset) at the output of the variable gain amplifier (VGA, variable gain amplifier) ​​and the output of the low pass filter (LPF, low pass filter), This DC offset may block the signal path. Therefore, it is necessary to calibrate the DC offset of the VGA output. [0003] A method for calibrating the DC offset in the GSM receiver channel in the prior art is: the continuous DC elimination method, which uses the high-pass filter to have a large attenuation characteristic of the DC (direct current) component to realize the GSM reception. The DC offset in the machine...

Claims

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Application Information

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IPC IPC(8): H04L25/06
Inventor 诸小胜易岷刘涛李军
Owner HUAWEI TECH CO LTD
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