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20V going into NMOS enhancment BSB012N03LX3 FET, gate is completely DC offset sinewave. Capacitor C1 does yeild AC only @ ~180nA - how would I go about making higher currents with this or a similar topology?

enter image description here

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    \$\begingroup\$ Why did you expect anything different to happen? The mosfet is not properly biased. \$\endgroup\$ – Vladimir Cravero May 11 '18 at 7:24
  • \$\begingroup\$ You are not opening the gate. You need voltage across gate-source, not gate-ground. \$\endgroup\$ – winny May 11 '18 at 7:44
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the only current there is the current flowing through the mosfet gate capacitance.

You need to complete a DC circuit with the mosfet if you want to see amplification, currently the capacitor is blocking that DC circuit.

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Seems lite it would work but only with a resistor which imitates a short circuit to ground, normally a few mills is enough.enter image description here

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  • \$\begingroup\$ Why would the equivalent of a shorted output give more current? Why would a MOS that's not properly biased work in a linear region which is far thinner than the driving signal? And what is the purpose of the circuit? \$\endgroup\$ – a concerned citizen May 12 '18 at 8:08

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