Switched-Capacitor Error-Canceling Circuit for Low-Noise Conversion
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Solution Overview
Problem
Analog signal-processing circuits, particularly switched-capacitor circuits, face challenges in achieving low noise and low power consumption while maintaining accuracy and robustness to environmental variations, as they often introduce noise and require high power consumption to reduce noise levels.
Innovation Solution
The proposed solution involves a signal-processing circuit with multiple capacitors that operate in distinct phases to amplify signals, where one capacitor is charged in a negative-feedback configuration during the first phase and another is charged to cancel errors in the second phase, optimizing the degree of settling to balance noise reduction and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power consumption is increased to reduce noise in analog amplifier circuits, then noise level is reduced, but power consumption increases
Solution Approach 1:
The signal processing operation is divided into multiple discrete phases (sampling phase, holding phase, conversion phase) with distinct switching patterns. Each phase performs specific functions with optimized power consumption characteristics, allowing the circuit to achieve low noise performance without continuously high power consumption.
Solution Approach 2:
The circuit employs periodic switching operations at defined clock phases to perform signal processing. The switches are activated in specific sequences during different phases, creating periodic action that processes signals while minimizing continuous power dissipation and reducing noise through controlled timing.
2Measurement precision
If settling time is increased to improve accuracy, then measurement precision is improved, but speed decreases
Solution Approach 1:
The settling process is segmented into discrete phases with controlled durations. The sampling phase allows sufficient settling time for accuracy, while subsequent phases quickly complete conversion and output. This segmentation enables the circuit to achieve high accuracy without extending total processing time, maintaining high signal processing speed.
Solution Approach 2:
The circuit dynamically adjusts switching states and feedback connections during different phases to optimize both settling time and processing speed. During sampling phase, feedback is configured to enable rapid settling; during conversion phase, switching patterns are optimized for quick completion, achieving both accuracy and speed through dynamic control.
Data Source
AI summary
Herein disclosed are multiple embodiments of a signal-processing circuit that may be utilized in various circuits, including conversion circuitry. The signal-processing circuit may receive an input and produce charges on multiple different capacitors during different phases of operation based on the input. The charges stored on two or more of the multiple different capacitors may be utilized for producing an output of the signal-processing circuit, such as by combing the charges stored on two or more of the multiple different capacitors. Utilizing the charges on the multiple different capacitors may provide for a high level of accuracy and robustness to variations of environmental factors, and/or a low noise level and power consumption when producing the output.