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It will be badly polarised. There is a PN junction between p-substrate and n-well. Also PN junctions beween n-well and p-MOSFET drain/source. These junctions have to be in reverse bias.
Real world is important, for me too. But try to stay at the possibly simplest level of the circuit theory. Let it be just a theoretical simplification.
If you have any suggestion about an Mosfet amplifier, which gain can be tuned without any impact on its output resistance, I'll be happy.
Our discussion is too complicted, while the problem of the output resistance of the amplifier is away.
Forget about the frequency range and about the output impedance. Let's take into consideration only a DC and small-signal conditions.
And now imagine the amplifier with a tunable gain. You...
how to make voltage amplifier
Thanks for your reply. The gain have to be controlled by any external signal, for example a voltage or a current. I have tried to use some simple MOSFET stages, but there is a problem of the output resistance. When the gain is changing then the output resistance is...
how can i make amplifier
Hmm... I need the gain to be controlled from about 0.90 to 0.999V/V. Maybe a term "follower" is not as good as the unity gain amplifier. It is possible to convert some circuits with opamps into functionally the same circuits, but with close-to-unity gain amplifiers...
make amplifier
I hope the author solved the problem of a voltage follower... it is not so difficult :-)
I am looking for another follower: I want it to have a tunable gain as well as a tunable output resistance. And it have to be as simple as possible. Is it possible to design such a circuit...
I have made a few chips with such a long channels, too. The application? MOSFET may be used as a tunable distributed RC line... In one element there are at least two: R, the channel resistance and C, the gate oxide capacitance. Just one transistor may work as a simple LP filter.
XCircuit makes Postscript files easy to put into LaTeX documents. The quality of these Postscript files is really great. XCircuit is very easy. There are some helpful key-shortcuts so the software is very handy and fast ;-)
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