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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22 Sep 1998
TL;DR: In this article, a new type of current controlled oscillator (CCO) was presented that combines excelllent control linearity with low timing jitter, and the problem of overshoot in traditional relaxation oscillators was solved by using an alternative for the Schmitt-trigger.
Abstract: A new type of current controlled oscillator (CCO) is presented that combines excelllent control linearity with low timing jitter. The problem of overshoot in traditional relaxation oscillators is solved by using an alternative for the Schmitt-trigger. Circuits realised in a 0.8µm CMOS process show a HD2 OSC =1.5 MHz for a supply current of 360µA.
16 citations
Patent•
08 Nov 2005
TL;DR: In this article, a control circuit having frequency modulation is used for reducing the EMI of a power converter, where a switching circuit is couple to a feedback circuit to generate a switching signal for regulating an output of the power converter.
Abstract: A control circuit having frequency modulation is used for reducing the EMI of a power converter. A switching circuit is couple to a feedback circuit to generate a switching signal for regulating an output of the power converter. A first oscillator is equipped to determine a switching frequency of the switching signal. A second oscillator is coupled to the first oscillator to modulate the switching frequency of the switching signal for reduce the EMI of the power converter. A programmable resistor is designed to attenuate the feedback signal of the feedback circuit. The resistance of the programmable resistor is controlled by the output of the second oscillator. Therefore, the output power and the output voltage can be kept constant when the switching frequency is modulated.
16 citations
18 May 2008
TL;DR: This paper considers two oscillators synchronized using capacitive coupling and a method of quasilinear approximation is used to evaluate the stability of synchronous oscillation.
Abstract: This paper considers two oscillators (van der Pol or Robinson type) synchronized using capacitive coupling. Equations are derived for the oscillation frequency and amplitudes. They show that the frequency of synchronous oscillation is different from the frequencies of individual oscillators. The amplitudes of oscillation are also different: one oscillator becomes a master and the second oscillator becomes a slave. A method of quasilinear approximation is used to evaluate the stability of synchronous oscillation. Simulation results for a 5 GHz oscillator confirm the theoretical analysis.
16 citations
Patent•
06 Aug 1984
TL;DR: In this article, the frequency of the output signal of the voltage controlled oscillator varies exponentially with the input voltages (VIN1, VIN2) to the oscillator.
Abstract: Voltage controlled oscillator (50) provides an exponential transfer function. The frequency of the output signal of the voltage controlled oscillator varies exponentially with the input voltages (VIN1, VIN2) to the oscillator. The exponential transfer characteristic is provided by means of a MOS field effect transistor (19) biased in its subthreshold range.
16 citations
Patent•
01 Dec 1997TL;DR: In this paper, a ring oscillator with a frequency stabilizing circuit produces compensated voltage signals in response to changes in supply voltage and temperature to modify the conductances of field effect transistors of the frequency stabilizer.
Abstract: A refresh circuit of a memory device includes a ring oscillator with a frequency stabilizing circuit. The frequency stabilizing circuit produces compensated voltage signals in response to changes in supply voltage and temperature to modify the conductances of field-effect transistors of the frequency stabilizing circuit to compensate the conductive path of the discharge current of a capacitor from the ring oscillator in order to stabilize the oscillation frequency.
16 citations