SAR ADC Delay Adjustment for Capacitor Stabilization
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Solution Overview
Problem
Analog-to-digital converters with capacitor array circuits face reduced output resolution due to stabilization time differences among capacitors, leading to inaccurate digital signals when quantization occurs before full stabilization.
Innovation Solution
A successive approximation register analog-to-digital converter with a delay adjustment mechanism, comprising a capacitor array circuit, quantizer circuit, delay adjustment circuit, control logic circuit, and detector circuitry, which adjusts the propagation delay of control signals to ensure capacitor stabilization before quantization, preventing errors and maintaining high operating speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If quantization is performed in a fixed period, then the converter operating speed is maintained, but the output resolution deteriorates due to incomplete capacitor stabilization
Solution Approach 1:
The patent applies dynamics by making the quantization period variable rather than fixed. The control logic circuit dynamically adjusts the timing of quantization based on real-time detection of capacitor stabilization status. This allows the system to extend the quantization period only when needed (when capacitors are not stabilized) and maintain short periods when capacitors are ready, thus improving resolution without excessive time loss.
Solution Approach 2:
The patent implements feedback through the detector circuitry that continuously monitors capacitor stabilization status and provides this information to the control logic circuit. This feedback mechanism enables the system to make informed decisions about when to perform quantization, ensuring that quantization only occurs after capacitors are sufficiently stabilized, thereby maintaining high output resolution.
2Measurement precision
If quantization is delayed to allow capacitor stabilization, then output resolution improves, but the converter operating speed decreases
Solution Approach 1:
The system dynamically adjusts the quantization timing based on actual capacitor stabilization status rather than using a fixed delay. The control logic circuit optimizes the balance between waiting for stabilization and maintaining operating speed by performing quantization as soon as capacitors are sufficiently stable, minimizing unnecessary delays while ensuring adequate stabilization time.
Solution Approach 2:
The patent changes the timing parameter of quantization based on detected capacitor stabilization conditions. Instead of a fixed time delay, the system adjusts the quantization timing parameter dynamically, allowing it to be extended only when stabilization is incomplete and maintained at minimum values when capacitors are ready, thus preserving operating speed while improving resolution.
3Measurement precision
If different stabilization times are accommodated for each capacitor, then measurement precision improves, but device complexity increases
Solution Approach 1:
The detector circuitry is segmented into multiple detection units, with each unit monitoring the stabilization status of individual capacitors or capacitor groups. This segmentation allows the system to track different stabilization times for different capacitors independently, enabling precise control of quantization timing for each capacitor while keeping the overall control mechanism modular and manageable.
Data Source
AI summary
A successive approximation register analog to digital converter includes a capacitor array circuit, a quantizer circuit, a delay adjustment circuit, a control logic circuit, and a detector circuitry. The capacitor array circuit samples input signals to generate first signals and is sequentially switched according to a first digital code. The quantizer circuit quantizes the first signals according to a first control signal to generate second signals and receives the first control signal via a signal path. The delay adjustment circuit is coupled in parallel with the signal path and selectively adjusts a propagation delay of the first control signal. The control logic circuit generates the first digital code according to the second signals. The detector circuitry detects whether a quantization of the quantizer circuit is completed to generate the first control signal.