Pipelined ADC Residue Amplification with Overlapped Stage Processing

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Solution Overview

Problem

Pipelined analog-to-digital converters (ADCs) face limitations in operational speed due to serial processing techniques, which restrict resolution and accuracy as requirements increase, leading to prolonged processing times.

Innovation Solution

Decoupling a portion of the residue amplification operation from input signal sampling and quantization allows for reduced processing time, enabling pipelined ADCs to operate at higher speeds by positioning multiple amplifiers between stages, where the amplification process of one amplifier overlaps with the sampling and quantization of the subsequent stage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If serial processing technique is used for sampling, quantization, and amplification, then the processing sequence is simple and easy to implement, but the operational speed is limited and processing time is prolonged

Engineering Contradiction:
Improveprocessing sequence simplicityVSAvoidoperational speed
Core Design Contradiction:
Ease of operationVSSpeed

Solution Approach 1:

The ADC is divided into multiple parallel processing stages (first ADC block and second ADC block), each capable of independent sampling, quantization, and amplification. This segmentation allows simultaneous processing of different signal portions, thereby increasing operational speed while maintaining implementation simplicity through modular design.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The first ADC block performs sampling, quantization, and amplification operations in advance before the second ADC block needs to process its input signal. By completing these operations preliminarily in parallel, the system achieves higher operational speed without complicating the processing sequence, as each block follows the same straightforward sequence independently.

Inventive Principle:
Principle #10Preliminary action

2Measurement precision

If resolution and accuracy requirements are increased, then the measurement precision is improved, but the processing time is prolonged due to serial processing limitations

Engineering Contradiction:
Improveresolution and accuracyVSAvoidprocessing time
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

High-resolution conversion is segmented across multiple parallel ADC blocks, where each block handles a portion of the total conversion task. This allows the system to achieve high measurement precision through cumulative processing while maintaining short processing time through parallel execution, avoiding the time penalty of sequential high-precision processing.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The parallel ADC blocks operate continuously and simultaneously, ensuring that useful conversion action is always occurring without idle waiting periods. This continuous parallel operation maintains high measurement precision requirements while minimizing processing time loss, as multiple conversions progress concurrently rather than sequentially.

Inventive Principle:
Principle #20Continuity of useful action

Data Source

PatentUS11218160B1Pipelined analog-to-digital converter
Publication Date: 2022.01.04 XILINX INC
  • US11218160B1 patent drawing
  • US11218160B1 patent drawing
  • US11218160B1 patent drawing

AI summary

An analog-to-digital (ADC) circuit is disclosed that includes a first stage, a first amplifier, and a second amplifier. The first stage includes signal processing circuitry, and is configured to receive a differential input signal and generate a differential residue voltage signal on differential output nodes of the first stage. The first amplifier includes first amplifier circuitry. The first amplifier is electrically connected to the differential output nodes of the first stage, and configured to receive the differential residue voltage signal, and generate a first differential voltage signal from the differential residue voltage signal. The second amplifier includes second amplifier circuitry. The second amplifier is electrically connected to differential output nodes of the first amplifier, and configured to receive the first differential voltage signal, and generate a second differential voltage signal from the first differential voltage signal.