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In your plot, there is an amplitude peak around 0dB, which indicates bad stability properties. Even if the thing is stable, you will probably see tremendous ringing in the transient behavior.
The phase plot does look a bit weird. Do you have a schematic?
Do you intend to use the amplifier in a...
fringe capacitors what
Hi,
Does anyone have any idea how much the dielectric constant of the insulator material changes in standard CMOS processes and how much better/worse this gets with process scaling?
I guess the TC should increase as more focus is placed on low k for less parasitic...
Re: Help on sizing transistors of differential folded-cascod
That depends on the output swing. The Vdd is 1.8V, so any swing above a few tenth of Volts will benefit greatly from 2-stage "linearity enhancement".
convolution why
Start by studying time-discrete convolution. FIR filters are a good example.
If you have grasped them (check that you understand linear phase FIR filters), you will have less trouble interpreting the time-continuous version.
Convolution is particularly useful for its property...
Re: Please recommend some materials about 12bit 100MHz pipel
Please state supply voltage and process.
Generally, the following may be a good guideline:
Terje Nortvedt Andersen, Bjørnar Hernes, Atle Briskemyr, Frode Telstø, Johnny
Bjørnsen, Thomas E. Bonnerud, and Øystein Moldsvor, “A...
Re: Help on sizing transistors of differential folded-cascod
Have you considered removing the compensation resistor and instead connecting the caps between folding nodes and output?
How about rewriting to a Gamma function and using one of these:
https://functions.wolfram.com/GammaBetaErf/Gamma2/06/01/01/
The expansion with (n-1)! looks very promising.
yep, and switches are in the right position too. i can change the compensation network to adjust the phase margin any way i want, but the overshoot always remains.
Hi,
I am designing an Op-Amp with around 200MHZ GBW and 100-dB DC gain and I notice that when I reduce the noise by width-scaling I get some overshoot in the transient response. The AC phase margin is alright, so anybody got any other suggestions?
MOSFETs are cheap. In addition, they can also generally handle more "power" than alternative devices. Some audio manufacturer once built an amp that had a hybrid output stage, with a MOS to deliver current, a BJT for large bandwidth and a tube for better distortion spectrum. I don't think his...
This depends on the signal swing at the output and the process. If, for example, your signal swing is +/-2V and supply is 5V, connecting a MOS from supply will work, as it will never saturate. Generally, though, think twice about this solution, because it is VERY sensitive to supply voltage (it...
Re: Basic MOS question
I like the answers I see here. Can anyone tell me how the so-called "low-threshold" MOSFETs are physically different from the regular ones?
Assuming you don't know too much about Matlab, try "doc fft" in the command window. It gives you this nice little example:
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Examples
A common use of Fourier transforms is to find the frequency components of a signal buried in a noisy time domain signal. Consider data sampled at 1000...
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