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| 13:34.23 | promach | For http://i.imgur.com/P99rpYA.png, I suppose loop gain is dimensionless ? |
| 13:41.32 | wpwrak | people can do funny things with units, but yes, they usually refrain from making gain anything other than dimensionless :) |
| 13:42.29 | promach | so, the text is wrong about loop gain being negative ? |
| 13:54.11 | wpwrak | no, negative is fine. gain = -1: for, say, 1 V that goes in, -1 V (negative voltage) come out. |
| 13:57.39 | 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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| 22:07.03 | DocScrutinizer05 | promach: umm, that indeed looks a tad strange, in figure b) the circuit operates outside its nominal range |
| 22:08.11 | DocScrutinizer05 | I'd apply e.g. VFF/2 to Vin, instead of grounding input |
| 22:08.19 | DocScrutinizer05 | VDD* |
| 22:09.10 | DocScrutinizer05 | depending on type of MOSFET you want a input bias for that circuit to work |
| 22:16.32 | DocScrutinizer05 | for negative resistance, see tunnel diodes |
| 22:17.24 | DocScrutinizer05 | https://en.wikipedia.org/wiki/File:Voltage_controlled_negative_resistance.svg red range = negative resistance |
| 22:18.07 | DocScrutinizer05 | actually tunnel diodes are used as active element in microwave oscillators |
| 22:19.10 | DocScrutinizer05 | you just need a PCB antenna structure (plus horn maybe) for the resonator circuit, plus a series resistor and the tunnel diode |
| 22:21.46 | DocScrutinizer05 | https://en.wikipedia.org/wiki/File:10Gig_Tunnel_Amp_M.jpg :-) |
