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Relaxation oscillator

About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.


Papers
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Patent
18 May 1971
TL;DR: In this article, the authors describe a means of shifting the frequency of the horizontal oscillator of a television receiver in the presence of high voltage increases which could cause X-radiation problems.
Abstract: Concurrently filed United States Patent application Ser. No. 144,457, entitled ''''HORIZONTAL OSCILLATOR DISABLING CIRCUIT'''' describes a means of shifting the frequency of the horizontal oscillator of a television receiver in the presence of high voltage increases which could cause X-radiation problems. As therein described, a negative direct voltage indicative of the developed ultor potential for its cathode-ray tube is combined with a relatively stable positive direct voltage to change the bias on a control transistor and the effective resistance in the time constant network determining the oscillator frequency. The present invention provides a further positive direct voltage to the transistor from the brightness control network of the receiver, so as to control the point at which the oscillator goes off frequency as a function of picture tube beam current. Such further voltage will be seen to reduce the criticality in determining the point at which the frequency shifting is to occur and the point at which the reproduced picture becomes unviewable.

7 citations

Patent
19 Feb 2014
TL;DR: In this article, a relaxation oscillator with the frequency jittering function is proposed to solve the problem that an existing switching power source is relatively concentrated in energy of electromagnetic interference and has great influences on a power source system.
Abstract: The invention discloses a relaxation oscillator with the frequency jittering function. The relaxation oscillator mainly solves the problem that an existing switching power source is relatively concentrated in energy of electromagnetic interference and has great influences on a power source system. The relaxation oscillator comprises an RC charge-discharge network (201), a first comparator (202), a second comparator (203), an RS trigger (204) and a frequency jittering control module (205). After a sawtooth voltage generated by the RC charge-discharge network (201) is compared with two threshold voltages through the two comparators, the sawtooth voltage is output to the RS trigger (204) to generate square signals with variable frequencies, charging or discharging of the RC charge-discharge network (201) is fed back and controlled by the square signals, the square signals simultaneously serve as clock signals to periodically change the charge-discharge capacitance in the RC charge-discharge network (201) through the frequency jittering control module (205), the frequencies of the output square signals are changed in a linear mode, and therefore the energy of the electromagnetic interference is dispersed. According to the relaxation oscillator, influences of the electromagnetic interference in a switching power source can be effectively reduced, and the relaxation oscillator can be used for management class chips of the switching power source.

7 citations

Proceedings ArticleDOI
22 May 2016
TL;DR: This paper describes an implementation of low power frequency modulated ultra-wideband (FM-UWB) transmitter in standard 130nm CMOS technology using a relaxation oscillator and a phase-locked loop to calibrate both the upper and the lower frequencies of the operation band.
Abstract: This paper describes an implementation of low power frequency modulated ultra-wideband (FM-UWB) transmitter in standard 130nm CMOS technology. The transmitter is designed to operate in the range of 3.328–4.608 GHz. A relaxation oscillator is used to generate the subcarrier signal which is calibrated by a phase-locked loop (PLL). The RF carrier is generated using a voltage-controlled oscillator (VCO). A proposed calibration scheme based on a PLL is utilized to calibrate both the upper and the lower frequencies of the operation band. The proposed FM-UWB transmitter consumes 835μW from a 1.2V supply at 500kbps achieving an energy efficiency of 1.67nJ/bit.

7 citations

Patent
02 May 1960

7 citations

Proceedings ArticleDOI
01 Nov 2013
TL;DR: In this article, a resistance to frequency convertor circuit proposed by the authors is critically analyzed in non-ideal conditions, due to the behavior of real components there is a deviation from idealities.
Abstract: Based on active bridge followed by a relaxation oscillator, a resistance to frequency convertor circuit proposed by the authors is critically analyzed in non-ideal conditions. Due to the behavior of real components there is a deviation from idealities. The main sources of error can be considered and analyzed by carrying out first order analysis. Each source of error is treated as separate from the other one which helps to neglect any possible correlation. For minimization of main error a compensating method is illustrated, and results on its experimental validation are reported.

7 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202322
202242
202128
202044
201962
201855