<wpwrak>
people can do funny things with units, but yes, they usually refrain from making gain anything other than dimensionless :)
<promach>
so, the text is wrong about loop gain being negative ?
<wpwrak>
no, negative is fine. gain = -1: for, say, 1 V that goes in, -1 V (negative voltage) come out.
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<promach>
then for http://i.imgur.com/6g66u3U.png , why 'one plus loop gain' does not consider the negative gain provided by the common-source structure of mosfet M2 ?
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<DocScrutinizer05>
promach: umm, that indeed looks a tad strange, in figure b) the circuit operates outside its nominal range
<DocScrutinizer05>
I'd apply e.g. VFF/2 to Vin, instead of grounding input
<DocScrutinizer05>
VDD*
<DocScrutinizer05>
depending on type of MOSFET you want a input bias for that circuit to work
<DocScrutinizer05>
for negative resistance, see tunnel diodes