Synchronized Ring Oscillator Chopping for 1/f Noise Reduction
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Solution Overview
Problem
Conventional ring oscillators suffer from 1/f noise issues in high-accuracy applications like audio circuits, where chopping operations are asynchronous, leading to errors and limiting the maximum chopping frequency, which in turn restricts the removal of noise.
Innovation Solution
Implement a circuitry with a differentially arranged pair of ring oscillators and a control logic to synchronize chopping operations by stopping each oscillator in a predefined state, enabling chopping only when both are stopped, and compensating for phase differences, thus avoiding timing issues and errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If asynchronous chopping is applied to ring oscillators, then 1/f noise reduction is achieved, but timing errors occur and maximum chopping frequency is limited
Solution Approach 1:
The control logic preemptively stops the ring oscillators at a predefined state before chopping operations begin. This preliminary action ensures that the oscillators are in a known, synchronized state, eliminating timing errors during chopping while maintaining the noise reduction benefits
Solution Approach 2:
The control logic monitors the state of ring oscillators and dynamically adjusts chopping timing based on feedback signals. When oscillators complete their cycles, the control logic receives feedback and synchronizes chopping operations accordingly, preventing phase detection errors while maximizing chopping frequency
2Object-affected harmful factors
If larger devices are used to reduce 1/f noise, then noise performance improves, but power consumption increases significantly
Solution Approach 1:
The system implements periodic chopping operations at optimized frequencies that coincide with the natural oscillation periods of the ring oscillators. This periodic action allows the use of smaller, lower-power devices while still achieving effective 1/f noise reduction through synchronized chopping that prevents timing errors
Solution Approach 2:
The invention changes the operating parameters by implementing synchronized chopping with predefined state stopping, allowing smaller device dimensions to be used. The parameter optimization enables noise reduction performance previously achievable only with large devices, but now with significantly reduced power consumption
3Object-affected harmful factors
If chopping frequency is increased to remove more 1/f noise, then noise removal effectiveness improves, but timing errors accumulate
Solution Approach 1:
Before each chopping operation, the control logic preemptively stops the oscillators at a predefined state, ensuring they are synchronized. This preliminary synchronization prevents timing errors even at high chopping frequencies, allowing aggressive noise removal without sacrificing reliability
Solution Approach 2:
The control logic uses feedback from oscillator completion signals to dynamically synchronize chopping operations. This feedback mechanism ensures that chopping always occurs at optimal moments, preventing error accumulation even when chopping frequency is increased to enhance noise removal effectiveness
Data Source
AI summary
Described herein is a circuitry for enabling synchronized chopping for ring oscillators. The circuitry may include a differentially arranged pair of ring oscillators; a chopping logic configured to perform a chopping operation for the ring oscillators; and a control logic configured to: stop each ring oscillator in a predefined state; enable the chopping logic to perform the chopping operation after both ring oscillators are stopped; and restart both ring oscillators after the chopping operation is completed.