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258 Threads found on Flicker
I look at it this way. With no large energy storage (electrolytic capacitors) your LEDs will always be dissipating the instantaneous input power, which will be sinusoidal at twice the line frequency. So you will get high ripple current and possibly visible flicker. You might also have more difficulty dealing with mains transients if it's a simple b
flicker noise is a relatively low frequency effect that "upconverts" to the RF region. So if you can lower the flicker noise of the device itself, you will have less clock jitter. Some sort of audio frequency feedback loop to bias your oscialator transistor, keeping fets outside of their voltage range extremes, applying analog feedback either in
Do you mean power-line flicker or just LED flicker? In both cases I'd say "no" but I assume you want to have proofs. May be these links well be helpful:
In fact the Noise Floor is weird and there isn't any flicker Noise corner or 1/fx drops directly If you post your simulation setup, we can interpret it better.
Hi, Some rules to follow: * use a solid GND plane as rock solid ground reference * stabilize VCC, especially there should be no influence when switching the relay. * stabilize ADC_Vref, same as above * stabilize the ADC input voltage, same as above. Now you should have stable ADC readings. But even then you might see the LSB to flicker. Impossib
Dear All, I'm using the typical circuit below as per the MOC3021 datasheet. 131237 I am using the circuit to control multiple types of light loads including LED light pulps and strips. When the Triac is in OFF state I notice that some LED lights are still lighting in dimmed and some lights keep flickering. I think
I bought one today and tried it just now I am probably using some wrong parts check this out. look at the Led's they arent working properly I have made VU meters from the 3914 IC. It is normal for led's to flicker due to the irregular waveforms. I see that the yellow led'
Hello everyone, I am trying to simulate the noise of a Schottky diode power detector. Theoretically, the flicker noise should approach zero if there is no dc bias but the simulation results I am getting using ADS are quite the contrary. Any comments and experiences are welcome. PS: I am attaching the plot of Id and output noise vs the DC bias v
Look guys neutral is only at earth potential at the supply transformer. Elsewhere it can be anything, though under normal conditions, its the I X R drop on the out of balance current causing a problem. We used to have a 6V bulb connected from N-E and it would flicker all the time and some times burn out. Frank
I want to calculate a simple CS amplifier flicker noise. The parameters for flicker noise calculation are Cox, W , L , freq and Kf. Other flicker noise constant Kf , i had remaining values. What is the value fot Kf ?
To know the inverter power (magnitude and direction), you'll multiply and voltage and current (instantaneous power) and average the product. Under circumstances, it's sufficient to form sign(P) = sign(V) xor sign (I), needs only two comparators. The inverter can also "source" or "sink" reactive power, in this case sign (P) will flicker with doub
It is normal for a lamp to flicker on and off at double the mains frequency for long fluorescent tube lamps or at around 38kHz for compact fluorescent light bulbs. You must smooth the on-off fluctuations from the IR detector with a filter.
Hello, I'm trying to implement a reliable feed back control loop for the output voltage of a sine wave inverter. The inverter has a Mosfet full-bridge driven by some PMW signals generated by an MCU. I have defined an extended look-up table to set the output voltage (from 33% to 97% of the maximum amplitude in steps of 0.5%). Thus I have a bidime
I would like to know whether Horizontal lines are similarly caused. My LCD tv has horizontal lines that flicker and vibrate vertically as if the tv has lost vertical sync. The pictures and sound will be ok. But this flickering is much less when there is no signal. Only a little when there is the tv logo and a blue screen... Any Ideas?
You have some strange delays in that program. It would be better to balance the timing so all the digits get equal time slots and equal spacing. You flicker is probably due to the slow down in the program while it performs long checking routines: if(timer == 100) { d0++; timer=0; if(d0>=10) { d0=0; d1++; if(d1>=10) {
Hi, This is second post on this forum. I am trying to understand contribution of buffer in the phase noise of LC VCO in any CMOS process especially at the low offset frequencies (1/f? region). When one adds a buffer with the VCO core and simulate phase noise at both VCO output and the buffer output, the phase noise at the far offsets starts de
Don't know what the "segment delay" value actually is, but there should be no problem to run the code in real hardware without flicker. In case you are talking about flickering in the proteus simulation, I suspect a pure simulation problem. Adjust the timeout in the LED display properties.
HI, I am confused about the beat signal of the radar when I read some IEEE papers. I have the following questions: 1. What is the purpose of the beat signal? To avoid flicker noise? 2. Beat signal only fit for LFMCW radar? 3. How to conduct beat signal in Radar? Is it the 1/T, T is the period of the waveform? 4. Based
Probably the bandwidth of your opamp is smaller than flicker noise corner frequency?
Hi, I'm talking about flicker, not Harmonics. IEC6100-3-3, IEC6100-3-2 refers to Harmonics I's minefield. Rob.
flicker noise is infinite at DC. Speaking properly, what tends to infinity in the flicker noise model is its power spectral density. If I pass flicker noise through an on/off switch with switching frequency w, what the output spectrum would be? Would the spectrum be infinite at w, 3*w, 5*w?etc? It doe
Hi, I need some help. I have an HP8565A and I have no Frequency readout neither on the CRT nor on the LED readout. The problem started a few months ago when the LED readout started to flicker and display intermittent lighting of the segments. Now it just displays 0.0000 I checked the 10V reference and is within tolerance. All voltages on the
If the said delay is per row, 10 ms is surely too slow, 1 ms (= about 80 Hz refresh frequency) should be suffcient for flicker-free operation. To be sure that we are talking about the same thing, you should better describe the row and column signal sequence. May there something wrong.
The average current in the LED is (120V - 2V)/10k ohms divided by 2= 6mA which is not bright. It will flicker at 30Hz due to the diode. The LED will heat with about 0.012W and the 10k resistor will heat with 0.7W (it is way overloaded).
Good morning, i wrote a simple text file as "noise file name" for a Vdc (analogLib) in cadence. When i plot the PSD, the first region (flicker noise region) is characterized by "humps, because of a non linear interpolation, i suppose. How can i select a linear interpolation for these point? Thank you! Dario
Hi There is more detailed explanations telling about flicker Noise and It is inversely proportional to frequency. And they described about the reasons of flicker Noise.They are talking about crystal defects and DC current and recombination process also they are talking about memory of a circuit that is charge trapping in the semiconductor ma
According to Leeson phase noise equation, doubling the loaded-Q the phase noise gets 6dB better. Try to use Q of 100 instead of 50, and see what happen. At least you find if the reason is the low Q filter added to the circuit. Beware that Leeson equation applies only between 1/f flicker corner and the corner where the white (flat) noise starts.
It will work but it will not able to satistfy the specifications ( especially NF because FETs have higher flicker Noise compare to Bipolars) as above 50MHz.If your amplifier will work 5kHz, I don't recommend you to use FETs because their NF problems under 50-100MHz.Why don't you consider Biploar ? NXP,Avago,Infineon,CEL and Renesas have very wide b
I am sending the same float value (adc value) to MAX7219 Display function but the decimal points seems to flicker Do you mean the dot point is flicking alternating at wrong positions or is it just blinking at the same position ?
Phase Noise id principally dominated by Quality Factor of the Tank Circuit in MW Oscillators regarding to Linear Phase Noise approximation of Leeson.There are obviously other noise related parameters such as NF, flicker Noise corner frequency,Voltage Swing,OP Current etc. but Q factor is essentially dominant. An accurate and robust optimization tec
... how it comes if we increase the area of transistor can reduce flicker noise? This is only valid for constant drain current, and under sole consideration of the carrier density fluctuation (McWhorter) model, i.e. not considering other models like the mobility fluctuation (Hooge) or the c
This one is almost trivial... To parametrize/configure simple DIY boards powered by small 8-bit microcontrollers, one might use DIP switches or jumpers... Last few weeks I am experimenting with another solution - to define parameters on a smartphone GUI and then transfer them into the tiny 8-bit microcontroller using the "flicker" interface. The
The first problem I see is that you are only turning on the 10s display for 10ms every 1.02s. You might see it flicker, but probably not. You would need to continually refresh both displays in order for vision persistence to make them both appear on solid. Basically you need to add loop inside the for loop containing the two PORTD/PORTB output s
M given project to do noise analysis of pico ammeter ADC output. here the input is 1pA DC signal. for which i have nearly 100000 output samples. sampling rate is 3.5Kps. these readings have error percentage nearly 0.178%. So i need to do its noise analysis like i have to detect which types of noises it contain? separation of those noises and actual
There's this computer installed in a small medical diagnosis center. Since some days the display has begun to flicker when operating under the main supply. However when it operates under a pure sine wave inverter, the flickering dissapears. What can be the probable reason for flickering of LCD screen? Due to some other equipments installed
Thermal noise for hand calculation is most simply expressed as a drain current noise Idn=4 k T Γ g_ms where g_ms is the source transconductance and Γ a factor smoothly varying from 1/2 in weak inversion to 2/3 in strong inversion. It is valid for all regions of operation. As of flicker that's a much stickier matter since modern models us
For 220Vac you should be using MOC304x not MOC303x What range of control causes flicker? < 10%? Does adding 330R across Triac gate to MT2 help? Triac should not be grounded! That defeats safety isolation. flicker is usually caused by nonlinear lamp load and unequal trigger current in Triac quadrants. Which triac?
Hi all, When operating in saturation, subthreshold, or weak inversion, which MOSFET type has lower flicker noise: enhancement-mode or depletion-mode? Intuitively, the depletion FET should have lower flicker noise because the E-field within the gate oxide pushes carriers away from interfacial traps at the surface. Is there any data or other solid
I am doing noise analysis of op amp using hspice. The value of inosie, outnoise , flicker noise and thermal noise obtained from analysis is zero. Why??
I wonder what causes the flicker at low conduction angles. I reason that the flicker is faulty switching on either positive or negative cycles due differences in the triac quadrant characteristics and if the load current gets below the holding current, the triac will turn off. SO what determines the holding current? THe ESR value on the 2.2uF mig
Hello All, 2 quick questions on flicker noise in FETs: 1. Which region exhibits lower flicker noise - triode or saturation? 2. Does flicker noise exhibit a dependancy on Vov? Thanks, Diarmuid
Hi guys, I've got a 9 led torch - it takes 3x aaa batteries. So 4.5 volt? I want to get it running from a USB cable. I tried today - I used a USB to mini usb cable - the black and red wires. The torch lit up -- but the LEDs were CRAZY bright - started to flicker, and the touch was getting hotter and hotter. When I tried it again with ba
hai, help me in finding flicker noise frequency for calculating phase noise for LC VCO also how to calculate current at particular node using T-spice i tried using probe command it shows as \only_varactor_with_DGFET_20131204_153404.tsim but i did not find the voltage in manual they mentioned as .probe tran Saves all node voltages and vo
Because of flicker noise, should low freq noise be higher than high freq noise? Voltage noise yes, current noise no. See a typical MOSFET noise
In Continuous Time Delta Sigma ADC, there are two options in Feedback DAC generally. (1) Current DAC (2) Voltage DAC or Resistive DAC Regarding thermal and flicker noise, (2) have advantage. Regarding calibration for multi level DAC, (1) have advantage. Regarding speed, (1) have advantage. (1) occupy large area than (2) generally.
hello, can anyone tell me if there is a direst equation describing the flicker noise (in uV) inside the poly resistances ? thnx
Thanx for the rply. I am running PWM on Timer 0 interrupt. But when PWM starts flicker for LOAD on/off increses. What must be the reason. when PWM starts flicker for LOAD on/off increses?? I am sorry I didn't get your words fully. what do you mean by LOAD?? Best regards
Is it that flicker noise in diffusion resistors is perhaps not that big a component of the overall noise or something? flicker noise emerges from interferences of current flow at any boundary interfaces (worst in MOS channels). Diffusion resistors show more interface area (actually the whole reverse-biased silic
I spotted that too. Normal current for a 30W CFL at 220V would be around 140mA so restricting it to 7mA might be enough to stop it working but it might flicker instead. I would be inclined to drop C1 to 0.01uF to increase it's reactance to ~320K and see if it worked. The other alternative is to put a resistive load across the CFL but that wastes
It will not make sense without knowing the foundry/technology which has been used in the design of this LNA but it may be possible.. But GaAs devices introduce pretty high noises at lower frequencies around 50-200MHz because of flicker effect.If they overcome this problem, please let us know..;-)