Switching Regulator Noise Management for Sampled Systems
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Solution Overview
Problem
Highly integrated circuits face interference from switching noise generated by DC-DC switching regulators, which can propagate through supply rails and affect other subsystems, leading to potential interference with sampling operations.
Innovation Solution
A separate switching regulator system that includes a controller to manage switching operations by delaying switching events when they coincide with sampling times, using a noise management circuit to selectively delay switching signals and prevent noise propagation into sampled signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a switching regulator is used to convert DC voltage, then size and efficiency are improved, but switching noise is generated that can interfere with sampling operations
Solution Approach 1:
The controller delays the switching events of the switching regulator to occur before the sampling operation begins, or schedules them to complete before sampling starts. This preliminary timing arrangement prevents the switching noise from interfering with the sampling process, as the noisy switching transitions are completed before the sensitive sampling window opens.
Solution Approach 2:
The system uses periodic sampling operations with defined sampling windows, and the switching regulator is synchronized to operate periodically outside these sampling windows. By creating a periodic pattern where switching occurs only during non-sampling intervals, the harmful noise is systematically avoided during critical measurement periods.
2Measurement precision
If switching events are delayed to avoid noise, then sampling signal cleanliness is improved, but regulator response time may be affected
Solution Approach 1:
The controller dynamically adjusts the timing of switching events based on the real-time sampling schedule. Rather than using a fixed delay, the system flexibly schedules switching transitions to occur immediately before or after sampling windows, optimizing both signal quality and response time. This dynamic timing adaptation allows the regulator to respond efficiently while avoiding noise interference.
Solution Approach 2:
The system changes the timing parameter of switching events adaptively based on sampling requirements. By modifying when switching occurs relative to the sampling clock, the system maintains optimal regulator performance while ensuring clean sampling signals. The timing parameter is adjusted without fundamentally changing the regulator's operational characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively reduces switching noise interference by synchronizing switching regulator operations with sampling activities, ensuring cleaner sampled signals and improved system performance.
Implementation Method 1
The switching regulator typically includes an inductor (a stand-alone inductor or an inductor formed from a transformer, as examples) and one or more switches that the regulator opens and closes in a controlled manner to transfer energy between an input voltage source, the inductor and the regulator's output terminal to regulate an output voltage.
Implementation Method 2
The controller is adapted to operate the switch(es) to energy and de-energize the energy source element to regulate the output voltage.
Data Source
AI summary
A system includes a sampler to sample an input voltage and a switching regulator. The switching regulator is adapted to regulate a switching operation of the regulator in response to the sampling by the sampler.