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Calibrating method for digital/analog conventer used for two-point modulation and two-point modulation circuit

A technology of analog-to-analog converter and calibration method, which is applied in the field of communication, can solve problems such as low calibration efficiency and slow calibration speed, and achieve the effect of improving calibration efficiency and shortening calibration time

Active Publication Date: 2013-12-04
北京昂瑞微电子技术股份有限公司
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Problems solved by technology

[0005] Although the above calibration method can accurately calibrate the gain of the digital / analog converter, but because it uses the traversal method, the calibration speed is slow and the calibration efficiency is low

Method used

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  • Calibrating method for digital/analog conventer used for two-point modulation and two-point modulation circuit

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Embodiment Construction

[0019] In order to better understand and illustrate the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] The invention provides a calibration method for a digital / analog converter applied to two-point modulation. Please refer to figure 2 , figure 2 It is a flowchart of a calibration method for a digital / analog converter applied to two-point modulation according to the present invention. Such as figure 2 As shown, the calibration method includes the following steps:

[0021] In step S101, the value range of the control signal used to calibrate the gain of the digital / analog converter is obtained;

[0022] In step S102, the value range is processed by dichotomy and the calibration output value of the control signal is determined therefrom.

[0023] Specifically, in step S101, in the two-point modulation circuit, the calibration module outputs a control signal to the digital / analog c...

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Abstract

The invention provides a calibrating method for a digital / analog conventer used for two-point modulation. The calibrating method includes the steps that a value range of control signals used for calibrating gain of the digital / analog conventer; a bisection method is used for processing the value range, and calibrated output values of the control signals are determined. Correspondingly, the invention further provides a two-point modulation circuit which can achieve the calibrating method. Due to the fact that the value of the control signals used for calibrating gain of the digital / analog conventer is determined through a bisection method, calibrating time of the digital / analog conventer can be greatly shortened, and calibrating efficiency of the digital / analog conventer can be improved.

Description

technical field [0001] The invention relates to the technical field of communications, in particular to a calibration method for a digital / analog converter applied to two-point modulation and a two-point modulation circuit. Background technique [0002] The two-point modulation refers to the method of separately modulating the transmitted data by using two different modulation channels. Please refer to figure 1 , figure 1 It is a structural block diagram of a two-point modulation circuit of a preferred embodiment in the prior art. Such as figure 1 As shown, the two-point modulation circuit includes a phase-locked loop (PLL), a sigma-delta modulator (SDM), a digital-to-analog converter (DAC) and a calibration module. Specifically, the phase-locked loop includes a crystal oscillator (XTAL), a phase / frequency detector (PFD), a charge pump (CP), a low-pass filter (LPF), a voltage-controlled oscillator (VCO) and a frequency divider (Divider) . Among them, the crystal oscill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10
Inventor 刘成杨清华
Owner 北京昂瑞微电子技术股份有限公司
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