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Never done that before, but you can try measuring the resistance of your skin as a first step. I saw some strange guy demonstrate that to me once. You'll have to wet the 2 ends of the multimeter first though. :wink:
Supply current is the total current the opamp draws from the power supply (VCC). Bias current is a small current it needs that's normally provided by a current reference circuit, e.g. a bandgap, to get it working.
ota how to increase gbw
I doubt you can get it to 100MHz UGBW and a DC gain at low frequencies of 80dB with CMOS. You'll need bipolar or bicmos for that.
Re: hspice error
Always search for the element that is referenced in any error message. If you can't find the instantiation or subckt....then there's a problem. Or maybe you didn't include the right file.
You are always expected to know as much as possible about the basics of MOS. I don't know what you mean by in depth. There's only so much you can know about a MOS. Most textbooks will say everything they have to say about it in the 1st chapter. Since you are not a fresh grad, they'll be more...
cell phone interface car security
Does anyone know how I can get hold of a kit like this off the shelf? Is there a company that will supply a mobile phone, sms, pic/mcu board with software?
Re: verilog and VHDL
I have coded with both before and seriously, I don't see much difference other than the syntax. You know one, and you'll pick up the other easily. At the end of the day, just learn whatever your school/ work uses.
I'll explain using an arm waving technique. Assume D2 is conducting. This implies a 0.6V drop across it. Which means net X (point where D1, D2 and R1 connect), is 2.4V. The current through R1 is simply 2.4mA, by ohm's law.
That 2.4mA has to come from somewhere. And there are 2 voltage sources...
In most cases, it really boils down to your design. But there's nothing to stop you from using minimum widths allowed by DRC rules for some non-critical nets.
Finding a MOS switch size for a S/H is a different kettle of fish. In this case, you won't need to know the gm. You should concentrate on the ON resistance of the MOS. Try looking up Phillip Allen's book for MOS switches. You also don't want to make it too big, otherwise you'll get clock feed...
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