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Calibration system of successive approximation analog-to-digital converter

An analog-to-digital converter and calibration system technology, applied in the field of signal calibration, can solve the problem of high calibration difficulty, and achieve the effect of reducing the complexity of calibration and the requirements of sampling accuracy.

Pending Publication Date: 2022-07-29
ZHUHAI HUGE IC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present application provides a calibration system for successive approximation analog-to-digital converters, which can solve the problem of high calibration difficulty caused by the need to collect input signals with the same phase and period twice in the related art

Method used

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  • Calibration system of successive approximation analog-to-digital converter
  • Calibration system of successive approximation analog-to-digital converter
  • Calibration system of successive approximation analog-to-digital converter

Examples

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example 1

[0057] Example 1, using a sub-DAC (CDAC) with a monotonic switching structure to form a fully differential structure SARADC

[0058] Figure 4 This is a schematic structural diagram of the capacitor array of the present application. The capacitor array adopts a monotonic switch structure to realize a full front differential structure. The capacitor array includes a first capacitor array and a second capacitor array. The first capacitor array includes: a non-inverting DAC and an inverting DAC, and the non-inverting DAC is composed of capacitors Cpn-1, Cpn-1, . . . , Spn-1, ..., Sp1, Sp0, Spd, sampling switch Sps, the inverting DAC consists of capacitors Cmn-1, Cmn-1, ..., Cm1, Cm0, Cmd, switches Smn-1, Smn-1...Sm1 , Sm0, Smd, sampling switch Sms composition. The second capacitor array includes a non-inverting DAC and an inverting DAC, the non-inverting DAC includes a switch Spd and a capacitor Cpd, and the inverting DAC includes a switch Smd and a capacitor Cmd.

[0059] Amo...

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Abstract

The embodiment of the invention discloses a calibration system of a successive approximation analog-to-digital converter, and relates to the field of signal calibration. The SARADC performs a process of sampling once and converting twice on an input analog signal: for the first conversion, no disturbance signal is added, and the first conversion is the same as normal analog-to-digital conversion; according to the second conversion, the input analog signal is not sampled, the analog signal obtained through the first conversion sampling is not released, the disturbance signal is injected into the capacitor DAC through the disturbance capacitor array, and the disturbance signal does not need to be injected into the input analog signal. And input analog signals with the same phase and amplitude in two times of sampling are not needed.

Description

technical field [0001] The present application relates to the field of signal calibration, and in particular, to a calibration system for a successive approximation analog-to-digital converter. Background technique [0002] In the process of integrated circuit manufacturing, there is an error in the capacitance value in the SARADC (successive approximation register analog-to-digital converter, successive approximation analog-to-digital converter). It is very small, and the most advanced integrated circuit manufacturing technology cannot guarantee such a high-precision capacitor. Therefore, in order to ensure the effective accuracy of the SARADC, calibration technology must be used. [0003] Digital calibration algorithms for SARADCs have been discussed in many prior art. Calibration method: can be divided into analog calibration and digital calibration. The analog calibration method is limited by the device accuracy, its calibration accuracy is limited, and it generally in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10
CPCH03M1/1009
Inventor 陈国安熊正东颜承伟梁虔荣
Owner ZHUHAI HUGE IC CO LTD