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Semiconductor Voltage Output
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[QUOTE="DRealSeal, post: 3615416, member: 371734"] Hi all, this is my first post here. I'm hoping some input will help me verify what I am missing. This is a question from an exam paper I'm doing for a module on introduction to semiconductor technology [I]Calculate the CMOS inverter output voltage Vout, and the corresponding inverter current, for each of the following inverter input voltages: Vin = 1V Vin = 4V Vin = Vout = Vinv (inverter switching voltage) where the CMOS transistor parameters are as follows: Vthpd= -Vthpu=0.7V, Wpd/Lpd=2, Wpu/Lpu=4, μn=2μp, Vdd=3.5V Clearly state (and verify) all assumptions.[/I] The issue is less with the question, more with the sample solution that the lecturer has given, where he provides some assumptions, which has confused my previous understanding: Assume Vdspd ~ .3V, Vdspu = .3-3.5 = -3.2V Vdsatpd = Vgspd-Vthpd = 2.1 - .7 = 1.4 => in linear operation (to be verified after calculation) Vdsatpu = Vgspu-Vthpu = 2.1-3.5+.7 = -.7 => in satn operation (to be verified after calculation) I'm confused as to where he obtained the value '2.1'. I understand everything else with regards to equating the linear or saturated I-V MOSFET equations and proceeding from there, but I think I'm missing something rather basic here... go easy lol... [/QUOTE]
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