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DNL and INL are nonlinearities and affect the resolution like any other non linearities. They are like noise (though deterministic) and are unwanted thereby reducing the effective resolution. In order for DNL to have minimum effect, it should be targeted to be ±0.25LSB. If DNL is 1 LSB, then the...
Re: Vds and W/L
You will obviously see node n1 changing with W/L. Why? because of Vgs of top transistor and not because of vds of bottom transistor. The value at node n1 is determined by Vgs of M3. The current in the transistors is determined by Vgs of the bottom transistor M4.
Firstly how is...
Re: Vds and W/L
Why would vds depend on W/L? Drain is a high impedance node. The Id-Vds relation is a second order one. Changing W/L will not affect Vds whatsover as long as transistor is in saturation. The drain node voltage is fixed independently and not through the current or W/L.
Re: Vds and W/L
I assume its the over drive voltage (Vgs-Vth) you want vs W/L. For a fixed bias current, the overdrive voltage is inversely proportional to the square root of W/L. For a fixed gm, overdrive voltage is inversely proportional to W/L. You need to fix something like current or gm to...
I dint see your post properly. Assumed its a DT modulator. For a continuous time modulator, the integrator bandwidth is much lower, about 0.7 to 1.3 times the sampling rate. So you need UGfreq about 640 MHz.
Simplest 4-bit quantizer would be a 4 bit flash ADC.
The feedback DAC needs to be...
I was just checking some digital oscilloscopes from tektronics. They have parameters vertical resolution and vertical accuracy. DNL and INL affect these parameters. You will have some spec for your resolution. You can target ±0.25 LSB for DNL. If there is no resolution spec also then at least...
My understanding is that the DNL must be less than ±0.25LSB so that the oscilloscope can resolve N bits that you want. INL determines the accuracy of the oscilloscope desired.
Re: bias current
(Assuming constant current=temp independent current), It depends on what one is looking for. Lot of times constant gm biasing is used because gm is more critical compared to the actual bias current.
1.The first integrator is the most important block. The unity gain frequency for a discrete time sigma delta mod must be at least 3-4 times the switching frequency.
2. A comparator works as a 1 bit quantizer.
3. The integrator virtual ground node can be utilized for summing. A feedback resistor...
The peaks of the triangle wave must be equal to or greater than the peaks of the sine wave, else the audio signal amplitude will not be sensed and a low pass filter at the output will not give a faithful reproduction of the audio signal.
The concept of loop gain comes when there is a feedback from output to input. Also stability is an issue for only systems with feedback. Any system without feedback like feedforward systems need not bother about stability. (at very high frequencies, all the gate drain parasitics act as feedback...
Probably you need a system similar to biomedical systems. You need a microphone instead of electrodes and follow it up with preamp. This must be followed by filters to filter out unwanted frequency components. For this you need to know the exact frequency pattern of the termites. Finally you...
The switch resistance is resistance in triode region, i.e 1/K(Vgs-Vt). Here K=uoCox(W/L)
So the switch resistance depends on mobility uo and Threshold voltage Vt. Dependance on temperature is based on temperature dependance of uo and Vt.
Voltage dependance is dependant on variation of Vgs and Vt...
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