Hi,
Iam trying to understand how current mirror with FET works. I read on wikipedia that Id is a function of Vdg and Vgs, sure enough. and Keeping Vdg = 0 and driving a current with current source shall set the Vgs. This part is confusing - unless you have Vgs how can the mosfet even allow Id ?
As i Understand - the channel of the mosfet allows current only if there's a Vgs enough to widen the channel and Vdg helps in sucking the current.
Current mirror with BJTs is clear: the collector resistor connected to the base drives base current to bias the transistor and thus sets Vbe.
Can somebody explain current mirror with mosfets ?
TIA
Iam trying to understand how current mirror with FET works. I read on wikipedia that Id is a function of Vdg and Vgs, sure enough. and Keeping Vdg = 0 and driving a current with current source shall set the Vgs. This part is confusing - unless you have Vgs how can the mosfet even allow Id ?
As i Understand - the channel of the mosfet allows current only if there's a Vgs enough to widen the channel and Vdg helps in sucking the current.
Current mirror with BJTs is clear: the collector resistor connected to the base drives base current to bias the transistor and thus sets Vbe.
Can somebody explain current mirror with mosfets ?
TIA