A Study on Ultra-High-Resolution Resistive Sensor Interface Circuits

Puntos clave

• This research aims to implement a circuit that converts resistance differences into frequency using ultra-high resolution.
• Developed a circuit using two square wave oscillators based on reference and sensor resistance.
• Utilized bandpass filters for signal conditioning.
• Employed an analog multiplier for frequency modulation and a low-pass filter for signal extraction.
• Implemented a frequency divider using a phase-locked loop (PLL) for output enhancement.
• Achieved a 30-fold increase in resolution when setting the third harmonic o=3 and divider ratio N=10.
• Demonstrated effective frequency output corresponding to resistance differences.