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Yes, indeed, MBreakN4D is a N channel depletion type MOSFET. Therefore, Vth = -4V is not so weird after all: depletion type MOSFETs are on without any voltage applied to the gate. In order to find the transition point to saturation mode, i have performed a DC sweep analysis and have plotted VDS...
Thanks everyone for helping me out!
I have biased the gates of input transistors to VDD/2 = 2.5V; however i am not sure the transistors remain in saturation mode. L=5u, W=20u for both transistors. Here is the output of Pspice (9.1 student version):
Threshold voltage seems really weird (Vth =...
I am trying to find the operating point of a differential amplifier. What is the right procedure i should follow? Should i ground the inputs and do a BIAS point analysis? Or should i do a DC sweep on one input?
Thanks in advance for any suggestions!
Thanks for the advice. I am afraid that a folded cascode topology would not satisfy either the upper or the lower ICMR requirement (Vt,n=0.7V, Vt,p=-0.9V).
I would like to design an OPAMP using 0.6μm technology with the following specifications:
Vdd=3V (single)
Av>80dB
GB>20MHz
ICMR=0.5-2.5V
output swing: 0.5-2.5V
phase margin: >50deg
settling time (0.1%): 20ns (2pf load)
PSRR: >40dB
What is the simplest topology that would meet these...
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