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Folks,
Anyone has experience or idea of how to drive the switched capacitor sigma delta ADC to achieve the high linearity especially for high SNR ones (i.e. sample cap is big)?
Suppose the linearity performance of the ADC is high enough, it seems that the front-end opamp like PGA to drive the...
Hi zorro,
Thank you very much for your help.
I agree your statement about DC. Then my question goes to how to correctly remove DC for spectral analysis using window. It looks like I have to drop more bins anyway (i.e. 2 for hanning window and more for other window), otherwise SNR calculated...
Folks,
Since windowed FFT of a signal with DC offset will produce the shape of the FFT of the window function around DC bins, which may mask out the interested signals at those bins, I'd like to remove DC component "during" FFT analysis.
My question is whether to remove the DC offset of the...
Folks,
I'd like to choose a DAC topology to have below spec:
1. 100KHz sample rate
2. 10 bit
3. minimum DNL but much relaxed requirements on INL
Can anyone suggest a topology to have smallest area?
Thanks,
SQ
Hi Guys,
I'm newbie on nyquist DAC/ADC.
Is there any material/doc having theoretical proof of relationship between a DAC being monotonic and maximum INL/DNL?
Thanks in advance!
I actually mean f0dB of the open loop gain of a LDO. And I borrowed the term GBW from amplifier.
Here is what I think: although LDO is not a amplifier to amplify signal, it does act like a amplifier to reject supply noise or transient load dump. So I guess these performance will be related to...
a bandlimit white noise x(t) with PSD of S0 is sampled (no aliasing) to produce x[n]. The PSD of x[n] is calculated to be S0/Ts (Ts is the sample period).
Now I just reconstruct the continuous noise xr(t) by passing x[n] impulses to the ideal reconstruction filter (gain=Ts, -fs<f<fs). The...
spectre operational transconductance amplifier
(1) usually 60 degree across PVT corners is sufficient, 90 degree seems to be overdesigned
(2) you can refer to Willy Sansen's "analog deisng esstential", there is a whole chapter on analog filters. It can be found in this forum.
spectre vccs
Yes, in practical single-ended version of low pass filter is sufficient as long as you keep outputs of VCCS floating as differential outputs.
You probally need another ideal CMFB (balun in spectre) circuit to bias your output common mode voltage
a simple script segment to do FFT for a tone plus additive white noise.
nbpts = 32768;
fs = 1e3*nbpts;
nbprds = 7;
fi = fs/nbpts*nbprds;
amplitude = 1;
pnoise = 1e-6;
noise = random('norm',0,sqrt(pnoise),1,nbpts);
signal = amplitude*sin(2*pi*fi/fs*[0:nbpts-1]) + noise...
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