Pipelined ADC Digital Calibration for Op-Amp Gain Error
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Solution Overview
Problem
Traditional analog-to-digital converters achieve high speed and precision but result in high power consumption, necessitating a solution for converters with high speed, high precision, and low power consumption.
Innovation Solution
A pipelined analog-to-digital converter with a calibration mechanism that includes a pipelined conversion module, control module, equivalent gain error extraction module, error storage module, and coding reconstruction module, which selectively configures stages, calculates and stores equivalent gain errors, and performs coding reconstruction to improve accuracy and reduce power consumption by relaxing operational amplifier gain and bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional analog-to-digital converters are used to achieve high speed and high precision, then conversion accuracy and speed are improved, but power consumption increases
Solution Approach 1:
The converter is divided into multiple pipelined conversion stages, each handling a portion of the conversion process. This segmentation allows the system to achieve high precision through multiple coarse-to-fine conversion steps while maintaining lower power consumption per stage compared to a single high-precision converter.
Solution Approach 2:
The system dynamically adjusts operational parameters including the gain and bandwidth of operational amplifiers based on calibration data. By changing these parameters according to actual performance characteristics, the system maintains high conversion accuracy while optimizing power consumption.
2Measurement precision
If operational amplifiers with high gain and bandwidth are used to maintain accuracy, then conversion precision is improved, but power consumption increases
Solution Approach 1:
The system calibrates and adjusts the gain and bandwidth parameters of operational amplifiers based on measured performance. This allows the use of amplifiers with lower nominal specifications while maintaining required accuracy through digital compensation, thereby reducing power consumption.
Solution Approach 2:
The calibration mechanism provides feedback about actual operational amplifier performance, which is then used to adjust subsequent conversion operations. This feedback loop enables the system to compensate for variations in amplifier characteristics without requiring consistently high-performance amplifiers, reducing overall power consumption.
3Use of energy by moving object
If calibration mechanisms are added to reduce power consumption by relaxing operational amplifier requirements, then power consumption is reduced, but device complexity increases
Solution Approach 1:
A calibration mechanism acts as an intermediary between the operational amplifiers and the conversion process. This intermediary characterizes amplifier performance and enables digital compensation, allowing the use of lower-power amplifiers while maintaining accuracy. The added complexity is concentrated in the calibration subsystem rather than throughout the entire converter.
Solution Approach 2:
The system replaces stringent analog requirements (high-gain, high-bandwidth amplifiers) with a combination of modest analog components and digital processing. By substituting analog performance requirements with digital calibration and compensation, the system reduces power consumption while managing complexity through digital rather than analog solutions.
Data Source
AI summary
A pipelined analog-to-digital converter and an output calibration method for the same. The pipelined analog-to-digital converter introduces an error calibration mechanism on the basis of traditional pipelined analog-to-digital converters through a control module, an equivalent gain error extraction module, an error storage module and a coding reconstruction module to compensate for gain errors and setup errors caused by operational amplifiers in a pipelined conversion module, so that the analog-to-digital conversion accuracy is improved, and requirements for the gain and bandwidth of the operational amplifier are relaxed, which can effectively reduce the power consumption of the analog-to-digital converter and the complexity of the corresponding analog circuit; a curve fitting method is adopted to obtain an ideal output sequence and then calculate errors; meanwhile, extraction and calibration of equivalent gain errors are all done in digital ways, and therefore accuracy thereof is high.