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The carrier frequency harmonics and significant high-frequency energy of electromagnetic interference (EMI) produced is a major concern in pulse width modulation (PWM) circuit. This paper proposes a chaotic PWM generator for the reduction of EMI. The chaotic CMOS circuit presented is based on a stroboscopic map to realize the chaotic sequence generator, and then, this chaotic frequency generator is...
Quartz crystal microbalance (QCM) acquires the mass information through measuring the frequency shift. The detection sensitivity can achieve to nano-gram. A type of 15MHz QCM used in space contamination detection appeared the frequency jump when switching the power supply repeatedly, which disabled the measurement function. The analysis was made from quartz resonator and oscillator circuit which deciding...
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