Your test bench is wrong. Without feedback , dc operating point of the output stage will not be set in your op-amp. Running a dc or or ac analysis will not be meaningful without proper dc negative feedback. You may refer to Chapter 6 of Allen Holberg ,section Measurement and simulation of op-amps.
In the architecture given by DualX it is needed. You can convince yourself by seeing that the dc voltage of Vout is not properly defined in the open loop. To measure the open loop characteristic you should use something like as shown in the attachment. Chose a very high value of R and C.I dot think feedback is necessary for a single ended output op-amps.
Really need help on meeting the specifications on my circuit, the specs to meet are >1kV gain(60db), phase margin of 40-80degree and bandwidth of 35Mhz. The biggest problem is still getting the bandwidth and PM, as for the gain i've managed to get above 1kV. Please help me! Would really appreciate any help!! Thanks in advance!
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@nitishn5
ok thx i will try it out tml, can onli do in sch using sch com with the program installed.
@Junus2012
i am supposed to get this circuit to meet the specs, i cant just make a new 1 >.< but i will take a look at the designs guide, and as for y i used MOS capacitor is becoz there is a symbol for use in the layout, whereas the normal capacitor dont. Thanks btw!
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