SELF-OSCILLATING PARAMETRIC HUMIDITY SENSOR WITH FREQUENCY OUTPUT SIGNAL

Influences of Amplitude of Input Signal Frequency Components on Self - demodulated Signal of Parametric Sound Source ⋆

To signal processing precision of parametric sound source, the theoretical formula is derived in this paper used to calculate self-demodulated signal when dual-frequency signals taken as input of parametric sound source. And some experiments are done to verify the derived formula. This paper analyzes mainly the influences of amplitude changes of input signal frequency components on sound pressu...

Polyvinyl-alcohol (pva)-based Rf Humidity Sensor in Microwave Frequency

A highly sensitive, passive relative humidity (RH) sensor using polyvinyl-alcohol (PVA) dielectric film is presented. For the first time, PVA is investigated in microwave RF sensing devices for low cost, high resolution and accurate chipless RH sensor realization. Comparative study with traditional humidity sensing Kapton polymer is presented to validate superior performance of PVA film. Result...

Constant Switching Frequency Self-Oscillating Controlled Class-D Amplifiers

Self-Calibrated Humidity Sensor in CMOS without Post-Processing

A 1.1 μW power dissipation, voltage-output humidity sensor with 10% relative humidity accuracy was developed in the LFoundry 0.15 μm CMOS technology without post-processing. The sensor consists of a woven lateral array of electrodes implemented in CMOS top metal, a humidity-sensitive layer of Intervia Photodielectric 8023D-10, a CMOS capacitance to voltage converter, and the self-calibration ci...

Self-oscillating mode for frequency modulation noncontact atomic force microscopy