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Analog-to-digital converter for sampling input flow line

A technology of analog-to-digital converters and digital converters, which is applied in the field of pipeline-structured analog-to-digital converters, and can solve the problems of increasing design difficulty and cost, increasing sampling switch bandwidth and linearity requirements of analog-to-digital converters, etc.

Inactive Publication Date: 2006-12-13
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Designing an analog-to-digital converter suitable for undersampling input conditions increases the bandwidth and linearity requirements of the sampling switch, increasing design difficulty and cost

Method used

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  • Analog-to-digital converter for sampling input flow line
  • Analog-to-digital converter for sampling input flow line
  • Analog-to-digital converter for sampling input flow line

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Embodiment Construction

[0018] Further describe the present invention below in conjunction with accompanying drawing.

[0019] The analog-to-digital converter consists of an input sample-and-hold circuit 10, an 8-stage margin gain pipeline 11-12, a first-stage two-bit all-parallel analog-to-digital converter 13, 8 sub-analog-to-digital converters 14-16, and 8 sub-digital-to-analog converters 17 ~18, the pipeline output synchronous circuit 19 and the digital correction circuit 20 are composed, and its circuit block diagram is as follows image 3 shown. The sample-and-hold circuit 10 located at the input end samples the input signal through the grid voltage bootstrap switch, and uses an operational amplifier with a closed-loop gain of 1 to perform signal hold, 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 This output is also sampled, and the sampling voltage is amplified twice and then subtract...

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Abstract

The invention discloses a pipeline structure module converter for sampling and outputting in the integral circuit technological domain, which comprises the following parts: sampling keeping circuit, 8-grade residual gain pipeline, 1-grade 2-bit full parallel module converter, 8 module converters, 8 submodule converters, pipeline output and clock synchronous circuit and digital correcting circuit, wherein the sampling keeping circuit adopts gate voltage bootstrap switch technology and capacitance turning sampling keeping structure. The invention improves signal input bandwidth, which is fit for signal conversion of larger-frequency scale.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an analog-to-digital converter with a pipeline structure suitable for under-sampling input conditions. Background technique [0002] The design of high-speed, high-precision, and low-power analog-to-digital converters is the overall development trend in today's mixed-signal system chip design. Has a wide range of applications. Among the many kinds of analog-to-digital converter circuit structures, the pipeline structure has become the first choice because of its trade-off advantages in speed, accuracy and power consumption. [0003] The basic idea of ​​the pipeline structure is to evenly distribute the overall conversion accuracy requirements to each stage, and then combine the outputs of each stage to form the final conversion result. figure 1 It is a schematic diagram of the structure of a 1.5-bit pipeline structure analog-to-digital converter per stag...

Claims

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Application Information

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IPC IPC(8): H03M1/34H03M1/36
Inventor 许俊尹文婧姜杰叶凡李联
Owner FUDAN UNIV
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