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56 Threads found on Self Oscillator Circuit
Anyone can help with the above problem? Pls? Also, in HB sim, non-linear models for FETs & BJTs are to be used. So when a feedback is required to make the active device unstable, should I use the linear (small-sig) model or the non-linear one (which will be the one eventually used in HB sim)??? Thanks in advance To s
One option is discussed by kender, which is a boost converter. Other option is the self oscillator circuit, in which a small transformer (ofcourse ferrite) is self oscillated with one or two windings and produces a square wave stream, which can be rectified and regulated.
Below pls. find a paper on self-biased amplifiers!
I have a question about self-oscillation schmitt trigger frequency? Can I get 10 MHz square wave from self-oscillation schmitt trigger. I build up schematic that is given below. Also, I must use LM158. Anyone can give me an idea if it is possible to
Hi all This stun gun circuit any one have other circuit like this :evil: S 8O KRAT
This is an official HP document from 1998. It appears to be part of a class or a self study course.
Yea I have implemented the self-biased ckt. I am trying to meet the spec of Δf/ΔVdd<1%. How much variation in Vdd should I design up to? I am using 2.8 V supply voltage in TSMC 0.18 process. Thanks
I design a Colpitts oscillator f=2GHz.But the output is 500MHz and its this self oscillating?how to eliminate it?
Assalamo Alaykom I want if anyone help me to design a selfexcited mixer ( BJT Mixer ) in general circuit and using ADS tool .. I just want this as a training to the ADS software .. Thank you very much ..
Commercial could mean more user friendly but possible more power consuming. That is because the highest sensitivity and lowest power is where the divider operate as injection locked oscillator. I think you have the lowest required power level for correct operation where the selfoscillation is. If selfoscillation should be blocked you (...)
Kindly share u'r ideas, suggestions and experience in self building and experimenting a 100 Mhz frequency generator. Is it possible to make it work accurately without using any specialized soldering technique etc.?
the crystal it self is not an oscillator , so u can't connect it to the input of the PLL , u need a crystal oscillator to use crystall as the resonator , and the output of the crystal oscillator will be the input of the PLL khouly
I'm designing a 2 legged robot, which will be able to move backward when bumping into an object. But now i only concern how to change from moving forward to backward, by triggering the changes my self, no need bumping into an object. Still testing. Can anyone give me some ideas? I'm really stuck here.
So, the charge pump circuit must have self-osillator circuit??
Take a look at: The main problem is that you need an amplifying device to produce an oscillator. All real components have intrinsic resistance that damped out any sustained oscillations. Even if you can shock excite your system when you attach the battery, it will quickly die out due to ci
Here is the simplified schema of a self-oscillating class D amplifier. anyone explain it to me how this circuit work. Maybe some intuitive approach help me understand this circuit.
Dear all, I'm about to enter my final year of studies which would require me to take on a final year project. As a matter of fact, I have interest in the field of analog IC designing and I perfectly understand that this demands great amount of self-reading and exploration which is something that I'm prepared to go for. As of now, I'm given
Dear all, I'm a visual artist (never studied electronics but can read a circuit diagram and do build stuff) and I work also lot with sound. I'm making a work that uses 2 tuning forks with mirrors on the tines. As the forks vibrate a laser beam reflects off the mirrors and projects lisajous patterns. I have been having problems driving the forks in
It is possible. However, so few stages and high bandwidth may give you startup and/or amplitude problems. Getting to a "saturated" output amplitude requires enough phase shift and gain-at-frequency to make full swing. More stages will be slower, but more robust. The common-source, resistor-loaded style ought to be fairly self-biasing.
In many textbooks the double integrator oscillator DIO (quadrature oscillator) is mentioned as a circuit which is able to perform self sustained oscillations at a frequency Fo=1/2*Pi*T (T1=T2=T=RC=Time constants of both stages). But this circuit has some mystic properties and I ask myself: (...)
I think, the "L vs freq" diagram is showing the effect of inductor self-resonancy rather than a varying inductance. The effect can be better modelled by a parallel capacitance. Because I don't know your oscillator circuit, I can't determine if the parallel capacitance matters.
That necessary condition that makes that a linear system becomes a quasi-sinusoidal oscillator (i.e. Phase vs. frequency must have negative slope) is frequently overlooked. Let's try an intuitive, non rigorous justification: Imagine a linear circuit with an input and an output. Supose thet we connect a sinusoidal generator at the input
"Costly" ICs or not, they at least need to implement a boost converter, using an inductor/transformer and an oscillator, possibly a self-oscillating switching stage. Achieving low quiescent current and high efficiency is kind of a challenge for a simple low part count boost converter.
Dear George Hi As i understood , you want to learn how to design an oscillator with your hands and your self , right ? if yes , i can help you ! but before that , what is your exact problem in design . aren't you familiar with steps of design ? by the way , in which range of frequency you want design ? HF ? VHF ?UHF ? or less than these ? Best W
Hello, I wish to add slope compensation to a self oscillating boost converter, it is 12V input and Vout = 90V (its 36 amber leds in series at I = 30mA). The circuit inductor squeals like mad, and i wish to add slope compensation, -there is no oscillator, so i suppose i have to couple the drain volage back to the source current sense as (...)
Try reducing the value of the capacitor C0 to 50 pF (or at least very low) and upping the loop gain if required. A good oscillator should be self starting. Frank
The bias topology of the last source follower FET is a "Combo, Constant-Current / self-Biasing" technique, which was implemented to establish a flat load line without sacrificing the dynamic range. Perhaps can add a different current source than the one is working now, but would be a challenge to tune the bias point to maintain a good sinusoidal s
Which C2 ? The text refers to the emitter capacitor. As said in the description, the circuit works as a colpitts oscillator in combination with the internal transistor capacitance. But the bias point should be asjusted by P1 slightly below self oscillation. Generally, this class of receivers is called regenerative. http
I can imagine many circuits belonging to this category, e.g. self oscillating inductive voltage converters. I guess, the battery suggest an efficient converter and this will be most likely a modern integrated boost converter with low quiescent current and voltage regulation.
You forgot to attach the circuit Sorry for not attaching the circuit. I have attached it now Operation of the circuit: This circuit is a external synchronous self oscillator ZVS converter. As long as voltage at point Vg1 don't go below V1 * R5/(R5+R8) = 2.44V the MOSFET will (...)
I don't agree that the circuit works fine, because it produces rather distorted waveforms in simulation. There are tons of better oscillator circuits. Possible reasons why it might not work in real life: - FET IDSS/VGSS is too high for the circuit dimensioning. 2N3819 has a rather wide parameter range. Check for (...)
rectifier the line voltages filter them using high voltage polar capacitor. make a high frequency oscillator (in cfl self start oscillator by feed back winging is used). amplify this using high voltage transistor like 13001,13002,13003 or 13009. give these voltage to the chock and convert these into high voltage. pass these voltage (...)
you have forgotten too add a choke stub to the power rail my pal you also need a choke stub on the audio rail vc control rail these are crytical componets dont rely on just capacitors or resistors to decouple the supply rail and i think this circuit will self oscillate unless you use ceramic pcb {copper clad c
A few of my observations.... (1)Firstly your Iprobe should be in series with Rd if you want it to measure drain current, it won't measure anything where it is. (2) for this oscillator to work you want 0/360 degrees around the loop - therefore at 4GHz the device and resonator will add electrical length - you must add more electrical length - i
in order to generaste self oscillating on opamp circuit yuo must put opamp in feedback mode (some kind like that idon't know the term) and the feedback gain should have -1 magnitude in order to make positive feedback so if there is little bust voltage either from change at power supply or noise spike (maybe) could generate voltage on opamp output
Sorry to ask a personal question. I have been sent to Toshiba Japan for Analog IC design since last year November. Before I go to Japan, they told me I am going to learn PLL design. But when I am in Japan, they changed. So I asked for ADC/DAC design, but I didn't get it. I end up doing Pierce oscillator design until now. I have 10 months left fo
I am not sure if you have come across this site but I think you will find a lot of interesting info on induction heating .. A conceptual MOSFET self resonant oscillator This design is a result of small scale experimentation. I originally wanted to use SCRs because of the simplicity of the design. But it turns out that low cost, readily ava
You have to look at the self resinace frequency for the inductor and Q. RF inductor has high self resonance frequency and Q is large. You can use you homemade inductor for 100 MHz but you just need to concern about Q value. The Q value detemines the size of the conductor.
There is one good paper by John Maneatis on self-biased DLL and DPLL. Hope its helpful to u. cinch
Obviously the calculations are going to depend on the topology of your VCO's cell. One of the most common topologies is the differential delay cell, if you are using this one the best place you can go for info is to its creator's papers: "Low-jitter process-independent DLL and PLL based on self-biased techniques" by J. Maneatis "Precise delay
Hi guys, I'm working on a 400Hz 26Vrms 12W inverter but I had a few difficulties.. The system is defined as : An oscillator with generate the 400Hz sinus wave. It become a reference signal for the output. This signal is chopped vith a sawtooth signal to drive a H bridge. The load of the h bridge is the primary of the output transformer.
A summarized version: (especially how image production is started after mains is connected through a power transistor & relay) Here's the trick: When you switch on your set, a startup circuit pulses the horizontal oscillator. The startup circuit is like a defibrillator for a robot. In this case, the "robot" is the horizontal (...)
The said Cypress controllers are low speed USB. Also other vendors USB processors (e.g. from Microchip) are able to achieve 1.5% low speed accuracy with an internal oscillator The enCoReIII full speed controller is said to achieve 0.25% accuracy by self-tuning a low accuracy internal oscillator to the USB.
If you think of shrinking to lower effective width: ohmic resistance is the least problem. The self-inductance of such a metal connection on chip is in the order of about 0.2 pH/?m , i.e. its impedance is ≈1kΩ/?m at your frequency. Skin effect doesn't matter: skin depth is > 1?m. Depending on resistive matchin
In a short, the transistor's current gain and resistor dimensioning are defining the inverter input current and thus the maximum power. To increase it, the resistor values have to be reduced. But also the transistor and transformer rating must fit the intended power. Simple self oscillating inverters, as the present one have generally limited ef
The reason that the measured inductance changes with frequency is that the inductor contains self-capacitance. At this sort of frequency you have to try out the inductor in YOUR layout. Any change in inductance or layout will result in a different frequency. The best way is to use an inductor which oscillates in your layout at a slightly higher fre
You can provide a trimming circuit. Either factory trimmed, or on-the-fly self trimming upon power up.
Hello The circuits inside the telephones are simple . did you ever tried to do on off the telephone line ( short and cut ) . you will see that with this action you can get some numbers . it is the basic of all of the telephones . but you can find some other circuits inside the telephone , these days . for example auto pulser circuits , and (...)
I'm hoping for some general insight into possible causes and things to look out for regarding some troubles I'm having with a circuit I'm breadboarding. The circuit is basically an oscillator - its 'output' is fed back into its 'input' and it oscillates. The 'input' is a summing mixer - so you can add other input signals into the feedback (...)
The first circuit is a RF amplifier, its output is tuned to a frequency set by C' and L. The second circuit is a self oscillating mixer as found in the front end of a AM radio. L' and C4,C5,C6 tune the oscillator. C and L tune the IF transformer. Third circuit, T2 seems to be an (...)