[SOLVED] How can you increase the current through a bypass capacitor?

How can current be increased thru bypass capacitor

Trying to make AC with DC blocking capacitor with 2v DC offset sine into a nmos which has a 2vGS-threshold & 20vGS-max and cannot find out how to increase current thru load resistor. Also, can the capacitor in this circuit be electrolytic? What needs amending to up the current?

Re: How can current be increased thru bypass capacitor

there is no DC path in the source side to ground in the circuit.
Is it a new one proposed or a standard circuit?

Re: How can current be increased thru bypass capacitor

srizbf said:

there is no DC path in the source side to ground in the circuit.
Is it a new one proposed or a standard circuit?

Click to expand...

I am unsure what you mean by new or proposed but your suggestion did not increase current rather it makes distorted a distorted waveform.

Re: How can current be increased thru bypass capacitor

Maybe step back and say what you really want from
this thing, because it doesn't look like any kind of
sensible application to me. Neither one. And the way
you use "bypass capacitor" is not the way I do, or
have seen.

Vin (attributes), Zin, Vout/Iout, Zout, transfer
characteristic, words about application and the real
care-about would be more useful context than the
simulation plots of something you don't like but can
only vaguely say why.

First plot you are just seeing gate-source capacitive
current.

Second plot you are hard switching the FET and seeing
the chop you probably wanted, but the time constants
are all wrong for the frequency and the gain is high
enough to square the drain signal so all you see at
the "load" is the edges. You aren't even looking at any
of the nodes that really matter and you owe us more
of a try, than "your suggestion didn't work" (you picked
one way to get a DC path to ground and completely
rearranged the circuit, yourself).

Re: How can current be increased thru bypass capacitor

Hi,

To go down the path of least resistance and quote John McEnroe: "Surely you can't be serious?"

Re: How can current be increased thru bypass capacitor

I am unsure what you mean by new or proposed but your suggestion did not increase current rather it makes distorted a distorted waveform.

Click to expand...

I don't hear srizbf suggesting a circuit, just explaining why there's about no current in your first circuit attempt. According to your waveforms, the second circuit increases current by five orders of magnitude. Related to your (yet unsaid) intentions, both are probably equally useless.

Both have different deficiencies. Circuit 1 has no DC path, respectively no bias current and no signal gain. Circuit 2 changes the topology to common source and has much too high gain, thus the distortion. Also much too high capacitor coupling cut-off frequency, For 15 Hz cut-off frequency, C must have 10 mF rather than 200 µF.

"New or proposed"? You reinvent the square wheel. Wonder why it's rumbling.