Wideband Frequency Comparator Using Capacitor Voltage Comparison
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Solution Overview
Problem
Conventional frequency comparators are slow and lack accuracy, making them unsuitable for fast operations required in next-generation mobile communication systems, as they take several tens of microseconds to compare signal frequencies and require high counter bit numbers for precision.
Innovation Solution
A frequency comparator design that includes a pulse generation unit, a capacitor unit for charging and discharging voltages corresponding to input signals, and a voltage comparison unit to rapidly compare reference and target voltages, allowing for faster and more accurate frequency comparisons without the need for high counter bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional frequency counters are used to compare signal frequencies, then comparison accuracy can be improved by increasing counter bits, but comparison time increases to several tens of microseconds
Solution Approach 1:
The patent replaces the conventional mechanical counter-based frequency comparison system with an electrical system using capacitors, switches, and voltage comparators. The frequency comparison is achieved by converting frequency differences into voltage differences through capacitor charging/discharging processes, which can be performed much faster than mechanical counters, thereby reducing comparison time while maintaining accuracy
Solution Approach 2:
The patent changes the fundamental parameter used for frequency comparison from digital count values to analog voltage levels. By using capacitor charging/discharging voltages that are proportional to frequency, the system achieves fast comparison through voltage differential detection rather than counting operations, resolving the time-accuracy tradeoff
2Productivity
If conventional frequency counters are used, then frequency comparison can be performed, but the operation speed is too slow for next-generation mobile communication systems
Solution Approach 1:
The patent replaces slow mechanical counting operations with fast electrical voltage comparison operations. The capacitor-based voltage generation and comparison circuitry operates at speeds suitable for next-generation mobile communication systems, thereby improving productivity while maintaining the reliability needed for broadband applications
3Measurement precision
If higher counter bit numbers are used to improve comparison accuracy, then measurement precision increases, but device complexity increases
Solution Approach 1:
The patent replaces complex multi-bit counter systems with a simple analog voltage comparison system. Instead of using multiple counter bits to achieve precision, the system uses the natural proportionality between frequency and capacitor voltage, achieving high measurement precision with minimal circuit complexity
Solution Approach 2:
The patent transitions from digital parameter representation (counter bits) to analog parameter representation (voltage levels). This parameter change allows frequency comparison accuracy to be achieved through voltage magnitude differences rather than binary bit comparisons, significantly reducing device 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 enables faster and more accurate frequency comparisons, reducing comparison time and improving operational speed in wireless communication systems, making it suitable for broadband applications.
Implementation Method 1
a capacitor unit that is charged or discharged with a voltage corresponding to the reference signal output from the pulse generation unit to output a reference voltage having a variable first frequency range, and charged or discharged with a voltage corresponding to the comparison target signal output from the pulse generation unit to output a comparison target voltage having a variable second frequency range
Data Source
AI summary
A frequency comparator outputs an input reference signal and a comparison target signal as pulse-form signals, and is charged or discharged with a voltage corresponding to the reference signal to output a reference voltage having a variable first frequency range, and charged or discharged with a voltage corresponding to the comparison target signal to output a comparison target voltage having a variable second frequency range. The frequency comparator compares the reference voltage having the first frequency range and the comparison output voltage having the second frequency range.