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•
28 Oct 1998
TL;DR: In this paper, an analog PLL circuit consisting of a divider, a phase comparator, a charge pump, a low pass filter, and a voltage controlling oscillator is presented.
Abstract: The present invention provides an analog PLL circuit able to shorten a lockin time during which oscillating frequency and phase of a voltage controlling oscillator settle. An analog PLL circuit according to the present invention comprises a divider, a phase comparator, a charge pump, a low pass filter, a voltage controlling oscillator, and a divider. The voltage controlling oscillator has a ring oscillator composed of a plurality of logic inverting elements capable of changing the delay amount. During the reset period, the initial voltage is inputted to the voltage controlling oscillator via the analog switch, and the initial delay amount is set to each of the logic inverting elements. After the reset period finishes, at the point when the rising edge of the standard input signal is firstly inputted, the output of the D flip-flop becomes high level and the ring oscillator begins the oscillating operation.
7 citations
Patent•
05 Feb 1970
TL;DR: In this article, a clock selector circuit samples the output of the relaxation oscillators and, in accordance therewith, determines which counter circuit shall be utilized to supply synchronism control pulses to the relaxations.
Abstract: A highly reliable signal-generating circuit for providing, at an output, a plurality of phase-coordinated trains of pulses of high-frequency stability despite circuit failures within the signal-generating circuitry. A pair of crystal oscillators cause respective counter circuits to produce responsive sets of synchronism control pulses for regulating the frequency of a plurality of relaxation oscillator circuits. A clock selector circuit samples the output of the relaxation oscillators and, in accordance therewith, determines which counter circuit shall be utilized to supply synchronism control pulses to the relaxation oscillators. Corrective circuitry brings the nonselected counter circuit into synchronism with the selected counter circuit so that the former may be substituted for the latter if the latter fails to properly control the relaxation oscillator circuits. Phase control circuitry assures that necessary corrective activity occurs at times when such activity will not cause transient changes in the frequency of output pulses. Circuitry is provided to suppress the outputs of both counter circuits upon the occurrence of predetermined circuit failures. Under the latter conditions the output is maintained on an emergency basis by the relaxation oscillators.
7 citations
Patent•
21 Mar 1936
TL;DR: In this paper, a multivibrator is regarded as a form of relaxation oscillator, and the present paper relates to generators of electrical oscillations, and is particularly concerned with generators of the kind known as relaxation oscillators.
Abstract: The present invention relates to generators of electrical oscillations, and is particularly concerned with generators of the kind known as relaxation oscillators. For the purpose of this specification, a multivibrator will be regarded as a form of relaxation oscillator. My invention will best...
7 citations
Patent•
09 Apr 1970TL;DR: In this article, a loop current supervisory device and a central tone generator are coupled to a line leading to a called subscriber, each alternately rendered operative via a central astable relaxation oscillator.
Abstract: A loop current supervisory device and a central tone generator are coupled to a line leading to a called subscriber. Each is alternately rendered operative via a central astable relaxation oscillator. Thus loop current supervision and the ringing phase are clearly separated from each other.
6 citations