Clock Frequency Detection Circuit Using Pulse Narrowing Thresholds
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Solution Overview
Problem
Existing technologies require complex circuits for accurately detecting the frequency of a clock signal, which is inefficient for scenarios where only a change in frequency needs to be detected in real time.
Innovation Solution
A frequency-detecting circuit comprising a pulse-narrowing circuit and a judging-and-sampling circuit, which narrows the clock signal based on a detection-point frequency and samples it to indicate whether the frequency is above or below this threshold, using a pulse-narrowing process to determine the frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex circuit is designed to accurately detect the frequency value of a clock signal, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The frequency detection function is segmented into multiple frequency ranges, with each range detected by a dedicated pulse-narrowing circuit. This divides the complex task of accurate frequency measurement into simpler binary comparison tasks, reducing overall circuit complexity while maintaining detection precision.
Solution Approach 2:
The circuit performs partial frequency detection by only determining whether the frequency exceeds specific threshold values rather than measuring the exact frequency. This partial action approach suffices for frequency change detection scenarios, significantly simplifying the circuit design.
2Productivity
If real-time frequency change detection is implemented, then the productivity is improved, but the device complexity increases
Solution Approach 1:
The pulse-narrowing circuits operate periodically with fixed threshold frequencies, enabling real-time detection through simple periodic comparison rather than continuous complex measurement. This periodic operation achieves fast detection response while maintaining circuit simplicity.
Solution Approach 2:
The circuit uses simple, easily implementable pulse-narrowing units with fixed thresholds rather than complex continuous measurement systems. These simple detection elements can be quickly implemented and replaced, enabling fast real-time detection without complex infrastructure.
Data Source
AI summary
A frequency-detecting circuit and an electronic device are provided. The frequency-detecting circuit includes a pulse-narrowing circuit and a judging-and-sampling circuit coupled to the pulse-narrowing circuit. The pulse-narrowing circuit is configured to receive a to-be-detected clock signal, and perform at least one pulse-narrowing process for the to-be-detected clock signal. The pulse-narrowing circuit has at least one detection-point frequency, and the pulse-narrowing circuit is configured to narrow the to-be-detected clock signal based on the detection-point frequency to obtain a narrowed output clock signal. The judging-and-sampling circuit is configured to sample the narrowed output clock signal by employing the to-be-detected clock signal as a sampling clock signal to obtain a frequency indication signal. The frequency indication signal is configured to indicate whether the to-be-detected clock signal is greater than the detection-point frequency.