Frequency-Detecting Circuit Using Charge-Voltage Conversion
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Solution Overview
Problem
Existing frequency-detecting circuits require complex designs to accurately detect specific clock signal frequencies, and there is a need for a solution that can efficiently detect changes in clock signal frequency without requiring precise frequency measurement.
Innovation Solution
A frequency-detecting circuit comprising a control-signal generating circuit, a charging and discharging path, and a control-voltage generating circuit, which generates a voltage signal based on the frequency of the clock signal by controlling charging and discharging processes, allowing for the determination of frequency magnitude through voltage value detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex circuit is designed to accurately detect specific clock signal frequency values, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential information needed for the application - the magnitude relationship of clock signal frequency rather than its precise value. By using a charging and discharging circuit that generates voltage proportional to frequency magnitude, the system obtains sufficient information (frequency comparison) without the complexity of precise frequency measurement circuits.
Solution Approach 2:
The patent transforms the frequency detection problem into a voltage comparison problem. By converting frequency information into voltage magnitude through charging/discharging operations, the system can determine frequency relationships using simple voltage threshold comparisons rather than complex frequency counting or measurement circuits.
2Device complexity
If a simple circuit is used to detect only frequency changes, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent introduces a charging and discharging circuit as an intermediary that converts frequency information into voltage magnitude. This intermediary transformation allows the simple circuit to capture frequency magnitude relationships effectively, bridging the gap between circuit simplicity and detection accuracy by using voltage as a mediator to represent frequency information.
3Measurement precision
If precise frequency measurement is implemented, then measurement precision is improved, but loss of time increases due to complex processing
Solution Approach 1:
The patent replaces complex frequency counting or measurement mechanisms with a simpler voltage-based detection system. By substituting the mechanical/electrical frequency measurement process with a voltage magnitude comparison approach, the system achieves sufficient detection speed and accuracy without the time-consuming operations of traditional precise frequency measurement.
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
Enables efficient detection of clock signal frequency changes, providing a voltage signal that reflects the frequency magnitude, suitable for scenarios where precise frequency measurement is not necessary, and can be used in subsequent circuit applications.
Implementation Method 1
a charging and discharging path, coupled to the control-signal generating circuit, and performing a charging process or a discharging process under control of the second control signal
Data Source
AI summary
A frequency-detecting circuit, a DCC, and an electronic device. The frequency-detecting circuit includes a control-signal generating circuit generating a first control signal and a second control signal delayed relative to the first control signal; a charging and discharging path, under control of the second control signal, during a period with a pulse width when the second control signal is at a high level, performing the discharging process, and performing the charging process during another period when the second control signal is at a low level; and a control-voltage generating circuit, sampling values of a voltage of an output terminal of the charging and discharging path before the discharging process during a period with a pulse width when the first control signal is at the high level, to output a corresponding first voltage signal.