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I use the cosmosScope,too.
But I need to repeat this process for many corners,so I want to find a convinient way.
And I am in the same trouble of caculating the jitter.
Could you have any advices?
Thank you.
So, the Vfb and Vsense are both AC signals.
Only the err amp' s output voltage Vc and Vramp are regarded as DC value.
Then only know the ramp, and the duty cycle, I can decide the Vc.
Is it right?
The err amp's output voltage is used to be the threshold of the PWM comparator, and the another input of the pwm comparator is the mixed voltage of the ramp and sensed inductor current.
So, the two parameters that are the ratio of the current sensing and the err amp's output voltage can both...
err amp
:?::?:
When designing a dc-dc converter, usually a err amp is used to amplifier the voltage diffenrence between Vfb and Vref.
When I design a err amp, I don't know what the err amp output voltage should be.
And in some production, this node's voltage is called Vc.
So, the question is...
Got it, thank you. I get the period jitter.
But how to simulate the HD2,HD3?
why HD2 is xx dB,
but total harmonic distortion = 73.3390 percent
why the units of the HD2 and THD are different?
YES. HD2 means 2nd Harmonic Distortion.
Thanks.
Yes, it's period jitter. I find the definition.
'Period jitter is the measurement of a signal, generally a repeating signal, from one edge to another similar repeating edge. Common period measurement tools measure the rising edge of a signal to...
Thank you for reply.
1. I can get the v-f curve,but HD2, HD3 is usually used to descripe the nonlinearity, how can I get the HD2, HD3?
4. From some products, I found the parameter of output jitter is 50psp-p. How can I get it(psp-p) from eye diagram?
cosmosscope eye diagram jitter
I have some questions for help.
1. How to simulate the nonlinearity of a relaxation oscillator.
2. Why some papers use HD2 to descripe the control linearity of a oscillator instead of the THD or HD3.
3. what's the difference between ' .fft , .four '
4. What type...
Does current limit reduce the efficiency?
Current limit would prevent the duty cycle to be too large, the small duty cycle would reduce the boost converter's efficiency.
Added after 12 minutes:
If given the boost dcdc converter has no current limit and not to consume power , the load...
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