Pipeline structure analogue/digital converter of controlling input common-mode drift
A digital converter and structural analog-to-digital technology, applied in the field of pipeline structure analog-to-digital converters, can solve problems such as increasing design difficulty and cost, and achieve the effect of increasing design difficulty and cost
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[0020] Further describe the present invention below in conjunction with accompanying drawing.
[0021]The analog-to-digital converter is composed of an input sample-and-hold circuit 10, a 6-stage margin gain pipeline 11-13, sub-analog-to-digital converters 14-17, sub-digital-to-analog converters 18-20, a pipeline output synchronous circuit 21 and a digital correction circuit 22. .Its circuit block diagram is as follows image 3 As shown. The sample-and-hold circuit 10 located at the input end adopts the input signal and holds it, and its output is quantized by the sub-analog-to-digital converter 14 to generate a two-digit digital output; at the same time, the margin gain circuit 11 also samples this output, and amplifies the sampling voltage twice The subtraction from the conversion structure of the sub-DAC 18 is used as the input of the residual gain circuit 12 and the sub-ADC. The sub-ADC 14 also generates a 3-bit control signal while generating a two-bit quantized digital o...
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