RC Pulse Filter Circuit for Minimum Pulse Width Rejection
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Solution Overview
Problem
Existing pulse filter technologies struggle to effectively eliminate pulses of durations less than a specified minimum, leading to inefficiencies in signal processing.
Innovation Solution
A pulse filter circuit utilizing a resistance-capacitance (RC) charging-discharging circuit, a slicer, and logic-controlled switching circuitry to filter out pulses shorter than a specified duration by charging or discharging the RC circuit to cross the slicer's threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing pulse filter technologies are used, then signal processing can be performed, but pulses shorter than the specified minimum duration cannot be effectively eliminated
Solution Approach 1:
The patent changes the parameter of pulse duration by using an RC charging-discharging circuit with a specifically configured time constant. The circuit is calibrated so that only pulses exceeding a minimum duration can charge the capacitor sufficiently to trigger the slicer, thereby parameter-based filtering resolves the contradiction between reliable pulse elimination and processing efficiency
Solution Approach 2:
The RC charging-discharging circuit acts as an intermediary between the input signal and the slicer. This intermediate stage filters pulses by duration before they reach the decision circuit, enabling effective elimination of short pulses while maintaining efficient signal processing throughput
2Reliability
If pulses are filtered by duration using RC charging-discharging circuit, then short pulses are eliminated, but circuit complexity increases
Solution Approach 1:
The RC charging-discharging circuit performs multiple functions: it acts as a pulse duration filter, a signal conditioner, and a timing element. By making this single circuit multi-functional, the patent achieves reliable pulse duration filtering without proportionally increasing overall circuit complexity
Solution Approach 2:
The RC circuit automatically filters pulses based on their duration characteristics without requiring external control or complex logic. The circuit self-regulates by charging and discharging based on input pulse width, eliminating the need for additional control circuitry and reducing overall system complexity
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
The solution ensures that only pulses long enough to charge/discharge the RC circuit and cross the slicer's threshold are transmitted, effectively filtering out shorter pulses and improving signal processing efficiency.
Implementation Method 1
a resistance-capacitance (RC) charging-discharging circuit, the RC charging-discharging circuit calibrated to a first time constant based on timing information
Data Source
AI summary
A pulse filter circuit is configured to eliminate pulses that are less than a specified duration and pass those that are greater than the specified duration. A buffer receives a signal and applies the buffered signal to a resistance-capacitance charging-discharging circuit (e.g., RC filter). When the output of the RC filter has, in response to the buffered signal, charged or discharged, as appropriate, to cause the output of a slicer to change, logic circuitry controls switching circuitry to pull the output of the RC filter to be fully charged or discharged, respectively. In this manner, pulses that are too short to charge/discharge the RC filter enough to cross the threshold of the slicer do not reach the slicer circuit output, but pulses that are long enough to cross the slicer threshold are transmitted by the slicer.