Pipeline ADC Operation Stage Using Intermediate Voltage Quantization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing analog-to-digital converters (ADCs) face challenges in improving resolution and signal-to-noise ratio (SNR), which are crucial for advanced electronic applications.
Innovation Solution
The operation stage of a pipeline ADC incorporates a voltage conversion circuit, comparators, and a multiplexer to generate intermediate voltages from common-mode and differential signals, allowing comparators to compare these voltages with reference voltages, thereby enhancing the quantization process to improve resolution and SNR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ADC structures are used, then the device complexity is low, but the resolution and signal-to-noise ratio are insufficient
Solution Approach 1:
The ADC is divided into multiple operation stages, with each stage performing partial conversion. The first operation stage includes a voltage conversion circuit that generates an intermediate voltage from the input signal, which is then processed by a second operation stage. This segmentation allows each stage to contribute to the overall resolution without requiring a single complex stage to achieve the full resolution, thereby improving measurement precision while managing device complexity.
Solution Approach 2:
An intermediate voltage is introduced as a mediator between the input signal and the final digital output. The voltage conversion circuit generates this intermediate voltage, which represents a partial conversion of the input signal. This intermediate representation allows subsequent stages to process the signal with reduced complexity while maintaining improved resolution, resolving the contradiction between measurement precision and device complexity.
2Reliability
If conventional ADC structures are used, then the device complexity is low, but the signal-to-noise ratio is insufficient
Solution Approach 1:
The conversion process is segmented into multiple stages, with each stage contributing to noise reduction. The first operation stage performs initial conversion with its own noise characteristics, and the second operation stage processes the intermediate voltage with different noise characteristics. By distributing the conversion across stages, the overall signal-to-noise ratio is improved without requiring a single complex stage that would increase device complexity.
Solution Approach 2:
The intermediate voltage serves as a mediator that allows noise filtering and signal conditioning between stages. The voltage conversion circuit generates the intermediate voltage in a form that can be optimally processed by subsequent stages, improving the signal-to-noise ratio through multi-stage processing while avoiding the need for a single overly complex stage.
3Measurement precision
If multi-stage voltage conversion is implemented, then the resolution is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The resolution enhancement is achieved through segmentation into multiple operation stages, each with moderate precision requirements. Rather than requiring a single stage to achieve high resolution (which would demand extreme manufacturing precision), each stage contributes incrementally to the overall resolution. The voltage conversion circuit and subsequent processing stages each operate with achievable precision levels, and their combined effect achieves the desired overall resolution.
Solution Approach 2:
The invention changes the voltage parameters through the voltage conversion circuit, which generates an intermediate voltage with specific amplitude and polarity relationships to the input signal. By carefully controlling these voltage parameters (such as the gain of 2 in the intermediate voltage calculation), the system achieves resolution improvement through parameter transformation rather than through extreme manufacturing precision, making the system more manufacturable.
Data Source
AI summary
An ADC receives a first input signal and a second input signal and outputs a digital signal. The first input signal is a common-mode voltage plus a voltage difference, and the second input signal is the common-mode voltage minus the voltage difference. The ADC includes a voltage conversion circuit and multiple comparators. The voltage conversion circuit generates an intermediate voltage according to the first input signal, the second input signal, and the common-mode voltage. The comparators compare the intermediate voltage with N times a reference voltage, where N is greater than or equal to negative one and less than or equal to one. The intermediate voltage is the common-mode voltage plus or minus M times the voltage difference, where M is two to the power of R, and R is a positive integer.