Mosfet amplifier

169

03:36:38

Voltage divider biasing circuit.

published 11 years ago

safwat

11 years ago

What is the gain now

thebugger

11 years ago

That's not how you bias a mosfet. Mosfets are voltage driven and this is purely current driven. Here's what I'd suggest. Ground the gate through a 1Mohm resistor and decrease the input source to no more than 300mV otherwise the distortion level is pretty high.

yashgumaste

11 years ago

Yes I decreased the input source to 200mv. But if I ground the gate through 1Mohm resistor, all the input voltage will be grounded.

thebugger

11 years ago

1megaohm resistor not miliohm. 1megaohm is quite large. Just like the one that's already connected to the gate. You need a voltage divider chain in other words.

yashgumaste

11 years ago

@thebugger See if have built it correct. I have made another circuit beside the first. Check it. I cant see any appreciable amplification.

thebugger

11 years ago

Mosfets are voltage driven. And 200mV input won't drive it much with an emitter resistor. Remove the emitter resistor and readjust the bias.

yashgumaste

11 years ago

@thebugger See now....I made it..;)

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