Filter Bypass Circuit for Fast Step Response
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Solution Overview
Problem
Conventional filter circuits in magnetic field sensors and other applications increase response time and reduce bandwidth due to the inherent delay caused by filtering, which is not effectively mitigated by existing techniques.
Innovation Solution
A filter circuit with a step detector and logic circuit that dynamically bypasses the filter when a large input signal step is detected, allowing the input signal to bypass filtering and thereby reducing throughput delay by minimizing signal path response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter is used to remove undesirable spectral components, then the quality of the output signal is improved, but the response time of the circuit increases
Solution Approach 1:
The filter circuit dynamically switches between filtered and unfiltered signal paths based on the characteristics of the input signal. A detector identifies large step changes in the input signal, and a switch dynamically routes the signal either through the filter (for normal conditions) or directly to the output (for large steps), thereby adapting the system behavior to different signal conditions and reducing overall response time.
Solution Approach 2:
When a large step change is detected in the input signal, the system bypasses the filter entirely by switching the signal path to go directly from the input to the output. This skipping of the filtering process during critical transitions eliminates the delay that would otherwise occur, allowing the system to respond immediately to significant signal changes.
2Measurement precision
If a filter is used to reduce undesirable spectral components, then the bandwidth of the circuit is reduced
Solution Approach 1:
The system dynamically adjusts the filtering operation based on signal characteristics. For normal signal conditions, the filter operates to remove undesirable spectral components. When large step changes are detected, the system dynamically disables the filter, thereby maintaining full bandwidth and preventing the filtering-induced bandwidth reduction from affecting the overall system performance.
Data Source
AI summary
A filter circuit includes a filter having an input and an output at which an output of the filter is provided, a step detector coupled to receive an input signal at the input of the filter and configured to detect a predetermined step in the input signal and to assert a bypass signal in response to detection of the predetermined step. A logic circuit is responsive to the bypass signal and configured to cause the input signal to be coupled to the output of the filter without filtering when the bypass signal is asserted.