Pipelined ADC (Analog-to-Digital Converter) digital background correcting circuit with translation technology
A pipelined, correcting circuit technology, applied in the direction of analog/digital conversion calibration/testing, etc., can solve the problem that the input signal cannot achieve the full range, the correction is no longer accurate, and the change
Inactive Publication Date: 2012-10-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, when the correction stage input signal appears figure 2 When the slash is in the middle, the corrected output voltage will exceed the maximum voltage range, making the next level of correction no longer accurate, so this correction circuit has the disadvantage that the input signal cannot achieve a full range of changes
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[0013] The present invention will be further illustrated below through the embodiments in conjunction with the accompanying drawings. It should be noted that the parameters in the examples do not affect the generality of the present invention. Assuming that the pipelined ADC in the example has a resolution of 12 bits, and the correction stage is a 1.5-bit ADC, the specific structure of the example circuit is as follows:
[0014] A correction-stage ADC circuit 301, which includes three parts: a sub-stage ADC circuit 3011, a sub-stage DAC circuit 3012 and a subtractor circuit. Through the sub-stage ADC circuit 3011 to the input signal V in Perform digital-to-analog conversion to obtain the preliminary output digital code D of the correction level 1 stored in delay-aligned registers while the D 1 sent to the sub-stage DAC circuit 3012 to convert it into the sub-stage DAC output voltage V DAC , and finally the input signal V through the subtractor in with V DAC Subtract to g...
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The invention discloses a pipelined ADC (Analog-to-Digital Converter) digital background correcting circuit with a translation technology, which belongs to the field of digital correction. The pipelined ADC digital background correcting circuit structurally comprises a correcting-level ADC circuit, a conventional background correcting circuit and a transmission-characteristic translation circuit, wherein the correcting-level ADC circuit is used for converting an input analog signal Vin to a digital output signal D1 which is taken as correcting-level output, and simultaneously, is used for generating a residual signal Vref which is taken as an input signal of the conventional background correcting circuit; the conventional background correcting circuit is used for performing gain amplification and analog-to-digital conversion on the residual signal Vref and a random correcting signal to obtain digital signals, and then the digital signals are subjected to digital signal processing to obtain a correction coefficient gcal which is used for correcting gain errors in the digital output of an ADC, thus obtaining a digital code corrected at a follow-up level; the transmission-characteristic translation circuit generates a control signal by virtue of two comparators to control and judge whether voltage translation and translation compensation are needed, thus obtaining a corresponding digital compensation code which is taken as output of the compensation circuit; and then the digital outputs of the three modules are added to obtain final output Doubt at the correcting level.
Description
technical field [0001] The invention belongs to the field of digital correction, and in particular relates to a digital correction technology that satisfies the complete input of background correction of a pipelined analog-to-digital converter (ADC) by means of transmission characteristic translation. Background technique [0002] With the continuous development of digital technology and communication technology, the requirements for analog-to-digital converters (Analog-to-Digital Converter, ADC) are getting higher and higher. The role of the ADC is to convert continuous voltage signals into digital codes, and its performance requirements are mainly high speed, high resolution and low power consumption. There are many types of ADCs, and different ADCs have different structures due to their different performances, and the correction of the ADC is complementary to the structure of the ADC. So each ADC has its own unique correction method and structure. [0003] The multi-sta...
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IPC IPC(8): H03M1/10
Inventor 宁宁眭志凌陈华徐双恒李靖陈荣冠郑杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA