Hello everyone, First time post of the forum, so here goes...
I'm currently trying to follow the Mosfet amplifier tutorial on this site, I understand parts of it and have not clue about others. I have made a working circuit but with a lot of estimations and running it through ltspice first:
Where I am failing to understand is how to calculate the 'K' value to help calculate the voltages/ resistor values etc, I've searched over google and through forums but there is no answer that really helps:
K=12μCoxWL is a formula that comes up quite often but no explanation on how to use it.
even in the tutorial that I am following, it makes the assumption that the K value is already known, making it near impossible to calculate the values for Vgs.
The assumptions I made above where in the understanding that Vgs >Vth (for the mosfet i'm using its between 1-2.5vth IRLB3034), Vg > Vgs, in the tutorial they chosen Vg = 1/3Vdd. I'm trying to use a 9v supply so chose Vg = 3v, knowing Vgs < vg, set it too 2.5v (the max threshold voltage), meaning Vs is 0.5v, this allowing me to get the values in the circuit above... and though it works on these assumptions, I don't believe I have it working at it's optimum due to lack of understanding of this tutorial, I've build the circuit and it works as a preamp but I'm hoping to try improve it but can't find the resources to help me understand the biasing in saturation etc better.
Does anyone have any advice on this/ know of good material for a hobbyist of electronics to read that might help me solidify my knowledge to be able to get the maximum performance out of this circuit.
Thanks
I'm currently trying to follow the Mosfet amplifier tutorial on this site, I understand parts of it and have not clue about others. I have made a working circuit but with a lot of estimations and running it through ltspice first:
Where I am failing to understand is how to calculate the 'K' value to help calculate the voltages/ resistor values etc, I've searched over google and through forums but there is no answer that really helps:
K=12μCoxWL is a formula that comes up quite often but no explanation on how to use it.
even in the tutorial that I am following, it makes the assumption that the K value is already known, making it near impossible to calculate the values for Vgs.
The assumptions I made above where in the understanding that Vgs >Vth (for the mosfet i'm using its between 1-2.5vth IRLB3034), Vg > Vgs, in the tutorial they chosen Vg = 1/3Vdd. I'm trying to use a 9v supply so chose Vg = 3v, knowing Vgs < vg, set it too 2.5v (the max threshold voltage), meaning Vs is 0.5v, this allowing me to get the values in the circuit above... and though it works on these assumptions, I don't believe I have it working at it's optimum due to lack of understanding of this tutorial, I've build the circuit and it works as a preamp but I'm hoping to try improve it but can't find the resources to help me understand the biasing in saturation etc better.
Does anyone have any advice on this/ know of good material for a hobbyist of electronics to read that might help me solidify my knowledge to be able to get the maximum performance out of this circuit.
Thanks