HWN - Analog Design Interview Question

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#analogelectronics
#cmos
#vlsi
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#designengineer

Background Music Merry Bay - Ghostrifter Official

[MagedAlAnsary]

The output voltage at the end of section (2) is VDD*(R+R')/(2R+R'). There is no multiplication at the denominator.

[amitvikrampujar]

Please add correction to the output voltage at the end of section-2. It should be R+R+R' .

[sohamlakhote]

Thanx for the question. Why did you assume that MOSFET will turn on in the linear region? At the end of 1st region, VOUT= V(Drain)= VDD. The MOSFET will turn on in the Saturation thus discharging the capacitor linearly and not exponentially!!! After sometime when V(drain) falls below VDD/2 then MOSFET will act as a switch with on resistance R'. After that whatever you said is correct.

[timlee]

I think you mislabeled the y-axis
If not, your first clarifying question should have been "Can I assume that Vin is high enough to overcome the threshold voltage?" or something like that.

[ams_designer_]

Tau = Rx . C
Rx = R || (R + R')

[AkashG_ti]

If we assume the time constant of the capacitor is small then the will charge and discharge rapidly assuming charging upto Vdd again and discharging upto Vdd/2(appx assuming R' and R are same) and this will continue upto infinity if the waveform Vdd is as

[coolwinder]

You should have not taken the job as a member of this yt channal, but as a contractor, and not compromised on delivery of material to your viewers.

[dodtickson]

Initially the capacitor is charged and there’s no current through the transistor. The drain voltage should be vdd. If vin is less than vdd+vth then the transistor will turn on in saturation, which is confusing...

[ams_designer_]

This one I'm not sure, but isn't I_tau function = Vc / ( R + R' )

Similarly at initial point vc = vdd, so peak of Ic = I_tau peak
Vdd / (R+ R`)

Great question, thanks

[biswajit]

Good to see after long time... please continue..I have some interview questions...how do I send you?

[biswajit]

The solution does not seems logical enough...

[sauravmishra]

Thanks ..but we really need hardware schematic design in deep.

[amitjana]

@Hadware Ninja is the time constant of the ckt is R||(R+R').C?