Here's a design question our prof gave us to study for the exam. I'm having trouble putting it together.
A common source amplifier is shown. The FET is working in saturation and has gm = 0.5mS, Kn = 0.5 mA/V^2, Vtn = 1v and lambda = 0.02V^-1. The resistance of the signal source is 2kohms. There is a maximum gain of 112, and Id = 0.24mA. The circuit has output resistance of 20.9kohm, and input resistance of 892kohms. Determine Vds.
Alright so my thoughts when trying to come up with a solution were as follows:
1) It's given that the MOSFET is in saturation therefore: 0.24 = 0.25(Vgs - 1)^2(1+0.02Vds) 2) We know Vd = 12 - (Rd)(0.24) 3) We know Vs = 0.24(R5 + R4)
Also, this is DC analysis, so the capacitors act like open circuits; technically only the middle part of the circuit is off concern.
I don't know how to take it from here; we're not given any of the resistor values and it seems like there's simply not enough equations to cover the unknowns. I presume it's got something to do with the provided input and output impedences, but I just don't know how to apply them. Any help would be appreciated