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Topic: RC oscillator

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In the News (Wed 19 Jun 19)

  RC oscillator circuit with stable output frequency - Patent 6590463
The RC oscillator circuit with a stable output frequency according to claim 1, wherein the MOS transistor is connected to the second capacitor in parallel with a drain coupled to the first terminal of the second capacitor, and a source coupled to the ground voltage.
The RC oscillator circuit with a stable output frequency according to claim 1, wherein the MOS transistor is coupled to the first capacitor in parallel with a drain coupled to the first terminal of the first capacitor and a source coupled to the second terminal of the first capacitor.
The RC oscillator circuit with a stable output frequency according to claim 6, wherein the MOS transistor is connected to the second capacitor in parallel with a drain coupled to the first terminal of the second capacitor, and a source coupled to the ground voltage.
www.freepatentsonline.com /6590463.html   (2928 words)

 Microcontroller Clock—Crystal, Resonator, RC Oscillator, or Silicon Oscillator? - Maxim/Dallas
Silicon oscillators are typically a fully integrated version of the RC oscillator with the added benefits of current sources, matched resistors and capacitors, and temperature-compensation circuits for increased stability.
RC oscillators, in contrast, provide fast startup and low cost, but generally suffer from poor accuracy over temperature and supply voltage, and show variations from 5% to 50% of nominal output frequency.
Silicon oscillators are more precise than discrete component RC oscillator circuits, and many provide comparable accuracy to ceramic resonator-based oscillators.
www.maxim-ic.com /appnotes.cfm/an_pk/2154   (785 words)

  U.S. Patent: 5565819 - Accurate RC oscillator having modified threshold voltages - October 15, 1996
Oscillator circuits are used in a myriad of applications in the electronics industry for providing clock and other timing signals to electronic circuitry such as microprocessors, microcontrollers, flip-flop circuits, latch circuits, etc. RC oscillator circuits typically include a control circuit coupled to the interconnection between a series resistor-capacitor (RC) network.
One technique for building an RC oscillator is to use a conventional NE555 timer (the 555 timer), manufactured by National Semiconductor, as the circuit that controls the charging and discharging of the capacitor of the RC network.
Oscillator circuit 10 further includes voltage modifying circuits 24 and 25 for respectively generating modified high and low threshold voltages applied to comparators 16 and 18 based upon the overshoot (of voltage V.sub.H) or undershoot (of voltage V.sub.L) of the oscillatory signal appearing at circuit node 12 when flip flop 20 switches.
www.everypatent.com /comp/pat5565819.html   (3666 words)

 RC oscillator - Wikipedia, the free encyclopedia
Electronic oscillators are often designed around an LC tank circuit, a tuned circuit formed with an inductor and a capacitor.
In this circuit, two RC circuits are used, one with the RC components in series and one with the RC components in parallel.
More-sophisticated oscillators measure the output level and use this as feedback to control the gain of the voltage-controlled amplifier within the oscillator.
en.wikipedia.org /wiki/RC_oscillator   (417 words)

 Colpitts oscillator
Both the Armstrong and the Hartley oscillators have a tendency to be unstable in frequency because of junction capacitance.
The Colpitts oscillator is very similar to the shunt-fed Hartley oscillator, except that two capacitors are used in the tank circuit instead of a tapped coil (figure 2-15).
The major difference between the LC and RC oscillator is that the frequency-determining device in the RC oscillator is not a tank circuit.
www.tpub.com /neets/book9/35e.htm   (1351 words)

Oscillators are classified according to the waveshapes they produce and the requirements needed for them to produce oscillations.
In an oscillator, a portion of the output is fed back to sustain the input, as shown in figure 2-1.Enough power must be fed back to the input circuit for the oscillator to drive itself as does a signal generator.
For an RC phase-shift oscillator, the amplifier is biased for class A operation to minimize distortion of the wave or signal.
www.tpub.com /neets/book9/35.htm   (1571 words)

Crystal oscillators are usually, fixed frequency oscillators where stability and accuracy are the primary considerations.Temperature compensation may be applied to crystal oscillators to improve thermal stability of the crystal oscillator.
Oscillator lowers distortion and phase noise - this low-distortion crystal oscillator is essentially a modified Clapp oscillator that uses a four-transistor voltage follower instead of a single transistor and connects the crystal to a virtual ground at node G
This sine-wave oscillator is free of the cited disadvantage.
www.epanorama.net /links/oscillator.html   (4895 words)

Colpitts oscillators are somewhat similar to the shunt fed Hartley circuit except the Colpitts oscillator, instead of having a tapped inductor, utilises two series capacitors in its LC circuit.
Hartley oscillator are inductively coupled, variable frequency oscillators where the oscillator may be series or shunt fed. Hartley oscillators have the advantage of having one centre tapped inductor and one tuning capacitor.
The voltage controlled oscillator is tuned across its band by a "clean" dc voltage applied to the varactor diode to vary the net capacitance applied to the tuned circuit.
www.electronics-tutorials.com /oscillators/oscillators.htm   (686 words)

 Method of operating a microcontroller chip having an internal RC oscillator and microcontroller chip embodying the ...
The at least one peripheral unit comprises a timer unit having a counter incremented at a frequency proportional to an oscillation frequency of the RC oscillator.
The internal RC oscillator of the chip is not forced to oscillate at a specified frequency.
In order to calibrate the RC oscillator 17, an external calibration source 21 is connected to the capture input 20 of the 16-bit timer unit 18.
www.freepatentsonline.com /6925402.html   (3576 words)

 PIRA 5F30.00 RC CIRCUITS   (Site not responding. Last check: 2007-10-27)
The time constant of a RC circuit driven by the calibration signal is shown on an oscilloscope.
An RC relaxation oscillator has a neon lamp across the capacitor provide a visible discharge.
RC circuits are used to get a wave in neon bulbs that goes from the sink to the source.
www.physics.ncsu.edu /pira/5eandm/5F30.html   (315 words)

Clock oscillators are circuits which generate square wave or nearly square wave signals suitable for digital electronics circuit as clock signal.
Crystal oscillators are usually, fixed frequency oscillators where stability and accuracy are the primary considerations.
Sine wave oscillators are useful in applications like audio signal generation, reference signals for different applications and in measurement applications.
www.messaggeri.it /xoscillatori.htm   (3924 words)

 Audio Oscillator and the Oscilloscope   (Site not responding. Last check: 2007-10-27)
The operational principle of the audio oscillator is the same as the clock oscillator.
An RC circuit charges the input of an inverter until its switching threshold is reached.
Once that occurs, the RC charging point is switched to a ground point and the RC circuit will begin to discharge until the original charging cycle is reestablished and so forth.
web.acc.qcc.cuny.edu /nsfrobot/beeper.htm   (1246 words)

 AVR Freaks :: View topic - Using internal RC oscillator for USART clock source
If you use the internal oscillator as some do, you will need to fine tune it (using the calibration byte).
It is generally recommended to use a crystal for heavy duty comms because the baud rate error can be kept to pretty much 0% with the right crystal at pretty much all baud rates.
And it is also good to keep in mind, that in different AVRs, one of the internal oscillators is calibrated with a factory preset value, which assumes some specific supply voltage and temperature.
www.avrfreaks.net /index.php?name=PNphpBB2&file=printview&t=41545&start=0   (965 words)

 Radio Control Electronic Circuits
R/C Switch: This circuit is a so-called "Radio controlled Electronic Switch".
RC Network Eliminates Precision Reference: 08/04/94 EDN Design Ideas / (Electronic circuit added 5/02) The circuit in Fig 1 uses a magneto-resistive sensor to detect small magnet displacements without resorting to a precision voltage reference.
RC network quashes auxiliary Winding in quasiresonant converter: 04/01/04 EDN Design Ideas / (added 1/05) Quasi-square-wave-resonant converters, also known as QR (quasiresonant) converters, allow the design of flyback-type SMPSs (switch-mode power supplies) with a reduced EMI (electromagnetic-interference) signature and improved efficiency.
www.discovercircuits.com /R/rad-control.htm   (703 words)

 Opamp Wien-Bridge Oscillator
The RC network does a nice job of meeting one of the conditions for oscillation: the phase is 0 degrees at the design frequency.
The RC network falls short of the oscillation conditions in that the gain is only 1/3 V/V. How is the gain of 1V/V around the loop to be achieved?
Current source IS injects a pulse into the RC network to jump start the oscillations.
www.ecircuitcenter.com /Circuits/opwien/opwien.htm   (765 words)

 NXP (founded by Philips) P89LPC913 Oscillator Control Simulation Details
The Oscillator Control dialog displays and allows you to edit the configuration of the system CPU clock.
RC Oscillator is the RC oscillator frquency (in Hz).
WD Oscillator is the WD oscillator frquency (in Hz).
www.keil.com /dd/vtr/3679/4221.htm   (194 words)

 Electronics: Air Ionizer
The frequency is derived from an RC oscillator build by two CMOS Schmitt trigger inverters, a timing capacitor and a trimmable resistor for frequency adjustment.
The RC oscillator used here is quite simple and a very usable circuit.
The oscillation frequency is determined by the RC time constant of the timing capacitor and resistor, using a variable resistor of up to 1MOhm and capacitors from 100pF up to several 10µF a wide range of freqeuncies can be covered.
www.geocities.com /~uwezi/electronics/projects/ionizer.html   (1060 words)

 [No title]
In this type of oscillator a capacitor is charged at a defined rate then, when it reaches a set threshold, it is quickly discharged to a lower threshold when the discharge circuit switches off and the capacitor again charges.
One type of comparison is that of the probability of finding the object which is oscillating at a given distance x from the equilibrium position.
For the quantum mechanical case the probability of finding the oscillator in an interval Dx is the square of the wavefunction, and that is very different for the lower energy states.
www.lycos.com /info/oscillator--miscellaneous.html   (485 words)

 PIC clock oscillator tips and tricks   (Site not responding. Last check: 2007-10-27)
It is sometimes desirable to have an oscillator with better frequency stability than an RC oscillator, but with lower cost than a crystal.
An LC oscillator can be constructed by replacing the crystal directly with a coil, but retaining the two capacitors.
Common fundamental mode crystals may be forced to oscillate at their 3rd harmonic through the use of a parallel inductor.
www.brouhaha.com /~eric/pic/oscillator.html   (310 words)

 Wander in RC Oscillator.
Hi, I am designing a RC Based oscillator with the ocillation frequency of 1.5Mhz.
20 Jan 2004 10:19 Re: Wander in RC Oscillator.
Thsi design is just like the 3 stage ring oscillator with inverter being replaced by the comparator whose other input is from the bandgap refernce source...
www.edaboard.com /ftopic66712.html   (237 words)

 Nurohman's Lights and LED
CMOS Oscillator - 4 MHz oscillator using 74HC14 and inductor
Design and construction of radio frequency oscillators - Some people regard the design of RF Oscillators to be something akin to a "fl art".
Sqaure Wave Oscillator - two gates from a CMOS 4011 NAND chip form a simpel square wave oscillator where the mark space ratio can also be independantly controlled by varying the value of the resistors
www.nurohman.pk.cx /oscillator_rclc.htm   (134 words)

 RC oscillator for PIC16F54   (Site not responding. Last check: 2007-10-27)
Are you asking, "Is it possible to clock the 16F54 from an external oscillator?", or are you asking "Can I connect external passive components (resistor(s) and capacitor(s)) to the 16F54 to create a clock oscillator?".
Without knowing the exact topology of the RC oscillator you are using it is hard to suggest component values.
Yes, i read about RC dependencies and maybe is for this reason that MC don't say nothing specificaly about maximum frequency in RC mode.
forum.microchip.com /fb.aspx?m=197112   (733 words)

 Relaxation oscillator - Wikipedia, the free encyclopedia
A relaxation oscillator is an oscillator in which a capacitor is charged gradually and then discharged rapidly.
If the threshold element is a neon lamp, the circuit also provides a flash of light with each discharge of the capacitor.
The electrical output of a relaxation oscillator is usually a sawtooth wave.
en.wikipedia.org /wiki/Relaxation_oscillator   (189 words)

 An Introduction to Oscillator Design
Oscillators are used in almost all Spread Spectrum, RF and wireless systems -- thus designers should know something about them.
Oscillators occur sometimes even when we don't want them -- amplifiers can oscillate if stray feedback paths are present.
Thus, oscillators are not the simplest devices in the world to accurately design, simulate or model.
www.sss-mag.com /cosc.html   (1049 words)

 EDN Access -- 04.27.95 68HC11 instruction halts external RC clock   (Site not responding. Last check: 2007-10-27)
Crystal oscillators, on the other hand, can waste precious milliseconds coming up to speed and stabilizing.
The external RC oscillator uses simple Schmitt-trigger CMOS inverters.
The ┬ÁP's XTAL pin gates the RC oscillator.
www.edn.com /archives/1995/042795/09di6.htm   (159 words)

 Hobby Engineering: Prototyping Section
All oscillator components are socketed for easy removal, and are configured via a jumper block.
All 6 microcontroller I/O port pins are brought to a clearly labeled strip.
Oscillator options include footprints for a crystal or ceramic resonator with external capacitors (DC-20MHz), a ceramic resonator with internal capacitors (DC-20MHz), an external RC oscillator or using the internal oscillator.
www.hobbyengineering.com /SectionCP.html   (1773 words)

 CMOS 14-Stage Ripple-Carry Binary Counter/Divider and Oscillator - CD4060B - TI Product Folder
CD4060B consists of an oscillator section and 14 ripple-carry binary counter stages.
The oscillator configuration allows design of either RC or crystal oscillator circuits.
A RESET input is provided which resets the counter to the all-O's state and disables the oscillator.
focus.ti.com /docs/prod/folders/print/cd4060b.html   (635 words)

If you fit a PIC16F628 chip, you can use the RC oscillator inside the chip (4MHz or 37kHz - see 14.2.6 of PIC16F628.pdf) or the external RC 4MHz oscillator components (4k7 and 22p) on the PC board.
The oscillator components on the PC board do not have to be removed when using the internal oscillator.
The small current delivered by the 4k7 resistor in the RC oscillator will not damage the chip.
www.talkingelectronics.com /Projects/PIC_Lick-1/PicLick-1-P1.html   (1191 words)

 Conventional RC oscillators, though offer inexpensiveProgrammable High Frequency RC Oscillator   (Site not responding. Last check: 2007-10-27)
Conventional RC oscillators, though offer inexpensive components as resistors and capacitors, are not suitable for frequencies beyond few MHz.
Here, a VCO based RC oscillator is proposed, where the output frequency can be programmed finely with digital codes over range of higher frequencies on the fly.
In this architecture, divided output frequency of a VCO is compared precisely against an external RC time-constant at regular calibration interval and the VCO frequency is adjusted.
csdl.computer.org /comp/proceedings/vlsid/2005/2264/00/22640511abs.htm   (211 words)

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