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Resonant-Based Capacitive Pressure Sensor Read-Out Oscillating at 1.67 GHz in 0.18

Year: 2013 Volume: 7 Issue: 7 941 - 944 Pages

• Authors:
• Yong Wang
• Wang Ling Goh
• Jung Hyup Lee
• Kevin T. C. Chai
• Minkyu Je

Abstract: This paper presents a resonant-based read-out circuit for capacitive pressure sensors. The proposed read-out circuit consists of an LC oscillator and a counter. The circuit detects the capacitance changes of a capacitive pressure sensor by means of frequency shifts from its nominal operation frequency. The proposed circuit is designed in 0.18m CMOS with an estimated power consumption of 43.1mW. Simulation results show that the circuit has a capacitive resolution of 8.06kHz/fF, which enables it for high resolution pressure detection.

• Keywords:
• Capacitance-to-frequency converter
• Capacitive pressure sensor
• Digital counter
• LC oscillator.

Design of an Ultra Low Power Low Phase Noise CMOS LC Oscillator

Year: 2011 Volume: 5 Issue: 3 501 - 504 Pages

• Authors:
• Mahdi Ebrahimzadeh

Abstract: In this paper we introduce an ultra low power CMOS LC oscillator and analyze a method to design a low power low phase noise complementary CMOS LC oscillator. A 1.8GHz oscillator is designed based on this analysis. The circuit has power supply equal to 1.1 V and dissipates 0.17 mW power. The oscillator is also optimized for low phase noise behavior. The oscillator phase noise is -126.2 dBc/Hz and -144.4 dBc/Hz at 1 MHz and 8 MHz offset respectively.

• Keywords:
• LC oscillator
• Low Power
• Low Phase Noise