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RC oscillator is often used in CMOS mixed-signal integrated circuits where lower power dissipation and/or lower cost are required while precision requirements for the oscillation frequency are moderate. One of the challenges in RC oscillator in CMOS integrated circuits is frequency compensation for variations of process parameters and temperature because the time constant depends on absolute values...
This paper presents a novel high performance readout integrated circuit (ROIC) for conditioning and acquiring raw sensor signals for a frequency based converter platform. It consists of specific circuitry designed to interface capacitive sensors with high efficient frequency-to-code converters powered by an ultra-low temperature dependent voltage reference circuit. Thanks to a controlled compensation...
The relative gain intensity and corresponding permitted parametric of optical parametric oscillator based on periodically poled RbTiOAsO4 (PPRTA) have been analyzed and simulated. The permitted grating period of PPRTA was compared with those of periodically poled lithium niobate (PPLN) and periodically poled potassium titanyl phosphate (PPKTP).
An advanced automated calibration technique for a trimming inaccuracy (calibration tolerance) of low-cost quartz resonators that are using in the Universal Sensors and Transducers Interface (USTI) integrated circuits for precision frequency (period)-to-digital conversion is described in the paper. It was shown that such technique can be used also for reducing an error due to a quartz crystal aging...
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