Mobile terminal and calibrating device for analog-to-digital converter (ADC) module thereof

Abstract

The invention belongs to the technical field of mobile terminals, and discloses a mobile terminal and a calibrating device for an analog-to-digital converter (ADC) module thereof. The ADC module is arranged inside a baseband chip. The device comprises a band gap voltage source and a circuit, wherein the band gap voltage source is arranged in the platform of the mobile terminal and used for generating a reference voltage, and the circuit is connected with the band gap voltage source and the ADC module and used for providing the reference voltage generated by the band gap voltage source for theADC module. In the device, the band gap voltage source in the platform of the mobile terminal is used for providing voltage for the ADC module; and an external reference voltage source is not needed for the calibration of the ADC module when the ADC module is calibrated, so that the calibration error is greatly reduced and the calibration efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of mobile terminals, and in particular relates to a calibration device for a mobile terminal and an ADC module thereof. Background technique [0002] With the continuous development of mobile terminal technology, users have higher and higher requirements for mobile terminal functions. [0003] At present, in the process of R&D and production of mobile phone products, due to the discrete parameters of the selected electronic components, each mobile phone has a deviation in the sampling of the Analog-to-Digital Converter (ADC), so each Every mobile phone requires ADC calibration during the R&D or production process. [0004] see figure 1 , figure 1 Circuit diagram for ADC calibration in prior art: [0005] BB+PMIC is the baseband chip and power management chip: the baseband chip BB mainly runs software and ADC acquisition; the power management chip PMIC mainly completes the attenuation of the battery volta...

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Problems solved by technology

[0007] It can be seen from the above process that the calibration process must be realized through an external reference voltage source, and the operation of the external reference source requires operating time, which is included in the production time of the mobile phone production line. Reducing this time can improve the production speed of mobile phones; at the same time, if there is an error in the accuracy of the external reference voltage source, it will directly lead to an error in the calibration of the ADC module, which will affect the accuracy of the software for external analog signal discrimination

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