Topic
Relaxation oscillator
About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.
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Patent•
13 Jul 1995
TL;DR: In this paper, a modified Colpitts oscillator with a feedback loop and a parallel LC circuit is described. But the feedback loop is not designed for high Q, low distortion output.
Abstract: A Colpitts-type oscillator circuit suitable for use with electronic identification systems is disclosed. The oscillator circuit utilizes a pair of transistors coupled together with a feedback loop that includes a parallel LC circuit such that the output amplitude can be as high as a factor of 20 times the supply voltage or more while maintaining a high Q, low distortion output. The oscillator circuit is a modified Colpitts oscillator that includes a NPN transistor and a PNP transistor coupled together and a Colpitts type feedback loop containing a parallel LC circuit. The capacitance of the parallel LC circuit consists of at least two capacitors in series forming a capacitive divider which provides a low impedance feedback via the base of the NPN transistor into the emitter of the PNP transistor. The collector of the PNP transistor taps into the inductor of the parallel LC circuit such that the inductor is driven to resonance.
26 citations
TL;DR: The memristor has the advantage of occupying much less area than the equivalent capacitor, which may be important when trying to build on-chip oscillators for portable or medical applications.
Abstract: A relaxation oscillator using a memristor is hereby presented. The memristor is used to substitute the function of a capacitor in an equivalent RC oscillator. The voltage across the memristor changes according to the quantity and polarity of the current passing through, thus substituting the changing voltage across a capacitor in the equivalent RC oscillator. The memristor has the advantage of occupying much less area than the equivalent capacitor, which may be important when trying to build on-chip oscillators for portable or medical applications. Copyright © 2014 John Wiley & Sons, Ltd.
26 citations
TL;DR: In this article, a new type of synchronized chaos conditioned by the threshold synchronization of relaxation oscillators with chaotic behavior is studied experimentally, and it is shown that for a certain parameter ratio the pulses generated by the chaotic oscillator may be synchronized by periodic and chaotic pulse sequences generated by a drive oscillator.
26 citations
TL;DR: In this paper, a flat-coil inductive proximity sensor microsystem has been realized and successfully tested, and the flat coil, made with CMOS-compatible post processes, is connected to a versatile differential relaxation oscillator electronic interface.
Abstract: A high-sensitivity flat-coil inductive proximity sensor microsystem has been realized and successfully tested. The flat coil, made with CMOS-compatible post processes, is connected to a versatile differential relaxation oscillator electronic interface. In this new and simple interface, the excitation, the signal extraction and amplification are assured by only one operational amplifier. Experimental results on the microsystem confirm that large output frequency variations occur when a metallic target approaches the sensor.
26 citations