FrAxl93
Newbie level 1
Good morning.
I am in the need of powering my dsPIC with a 3.3 Volts supply but I don't have any generator around this value. I tried with the 3.3V ouput from Arduino but I think that it doesn't provide sufficient current*.
It happens that I am a bit short of components and I don't have access to any market. I don't have any voltage regulator and I have only 2 power MOSFET, 3 OPAMP, a 9V battery and an 12V power supply. I can't just create a voltage divider to create my 3.3 source since it will drop as soon as I connect the PIC, so I'll need something more reliable.
I decided to DC bias the MOSFET but in the **broken link removed** there is no trace of the parameters for the well known formula:
ID = 1/2µnCoxW/L (Vgs - Vt)2.
I know that such parameters are very temperature dependent so some datasheets just don't provide them, but how can I design the correct resistances if I don't know how to calculate the drain Current? This is the design I'd like to realize:
I read on the internet that serious analog projects involve designs that don't rely on those parameters, may you provide some fixed design for such stiff voltage source?
Big thanks for your help,
regards, Francesco.
*In order to prevent this question becoming too broad I won't talk about the issues with the pic that make me think that I have a problem with the maximum current, if you are interested ask me and I will add details.
I am in the need of powering my dsPIC with a 3.3 Volts supply but I don't have any generator around this value. I tried with the 3.3V ouput from Arduino but I think that it doesn't provide sufficient current*.
It happens that I am a bit short of components and I don't have access to any market. I don't have any voltage regulator and I have only 2 power MOSFET, 3 OPAMP, a 9V battery and an 12V power supply. I can't just create a voltage divider to create my 3.3 source since it will drop as soon as I connect the PIC, so I'll need something more reliable.
I decided to DC bias the MOSFET but in the **broken link removed** there is no trace of the parameters for the well known formula:
ID = 1/2µnCoxW/L (Vgs - Vt)2.
I know that such parameters are very temperature dependent so some datasheets just don't provide them, but how can I design the correct resistances if I don't know how to calculate the drain Current? This is the design I'd like to realize:
I read on the internet that serious analog projects involve designs that don't rely on those parameters, may you provide some fixed design for such stiff voltage source?
Big thanks for your help,
regards, Francesco.
*In order to prevent this question becoming too broad I won't talk about the issues with the pic that make me think that I have a problem with the maximum current, if you are interested ask me and I will add details.