Pipeline ADC Calibration for High-Speed Quantization Accuracy
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Solution Overview
Problem
Pipeline analog-to-digital converters face inaccuracies due to comparator circuits failing to generate correct quantization results within the shortened cycle time as clock speed increases, leading to incorrect digital output codes.
Innovation Solution
A pipeline analog-to-digital converter system incorporating multiple converter circuitries and a calibration circuitry that detects quantization completion and adjusts output digital codes to predetermined values based on control signals, ensuring accurate conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the clock speed is increased to improve conversion speed, then the productivity is improved, but the quantization accuracy deteriorates because comparator circuits cannot generate correct results within the shortened cycle time
Solution Approach 1:
The patent applies preliminary action by performing quantization in advance during an earlier time period, allowing the comparator circuit to complete its operation before the final output is required. This is achieved through a multi-stage pipeline architecture where quantization occurs in a first stage, and the results are stored and combined in subsequent stages, effectively decoupling the quantization timing from the final output timing.
Solution Approach 2:
The patent segments the conversion process into multiple independent stages: a first converter circuitry that performs quantization, a calibration circuitry that combines results, and a second converter circuitry that generates final output. This segmentation allows each stage to operate independently at optimized speeds, with the quantization stage completing its work before the clock cycle shortens affect the final output accuracy.
2Device complexity
If the operation period of each conversion stage is fixed to simplify control, then the device complexity is reduced, but the conversion accuracy deteriorates when clock speed increases and cycle time shortens
Solution Approach 1:
The patent introduces dynamic control through a calibration circuitry that detects whether quantization is completed and generates control signals to adjust the operation timing. This dynamic adjustment allows the system to adapt to varying clock speeds and quantization completion times, ensuring accuracy is maintained even as operating conditions change, without requiring complete redesign of the control architecture.
Solution Approach 2:
The patent implements feedback mechanisms where the calibration circuitry monitors the quantization completion status and uses this information to control the combining operation and generate appropriate control signals. This feedback loop ensures that the system can automatically adjust to maintain accuracy without increasing overall control complexity, as the feedback is localized to specific control points rather than requiring system-wide complex control.
Data Source
AI summary
A pipeline analog to digital converter includes converter circuitries and a calibration circuitry. The converter circuitries sequentially convert an input signal into a plurality of first digital codes, in which a first converter circuitry in the converter circuitries is configured to perform a quantization according to a first signal to generate a first corresponding digital code in the first digital codes, and the first signal is a signal, which is processed by the first converter circuitry, of the input signal and a previous stage residue signal. The calibration circuitry combines the first digital codes to output a second digital code, detects whether the quantization is completed to generate control signals, and determines whether to set the second digital code to be a second corresponding digital code in predetermined digital codes according to the control signals.