Hi everyone im on my 3rd year of university and i have a project to design an amplifier that amplifies the vin 100 times in orcad and i cant figure out how to make it amplify i'll post some screenshots of my simulations and design maybe someone can help




this is my design


this is my time domain simulatuin, red is the output, green the input




this is my ac sweep simulation

 

The (apparent) dot connecting M6 to the input should not be there.

 

The (apparent) dot connecting M6 to the input should not be there.
View attachment 221689

thank you that helped, i've also added 2 more resistors r68 and r 69 and one capacitor c21 to the schematic, played with the values some more and now i think it works as intended here are some screenshots

 

R68 and R69 are unnecessary.
If you need to change the bias point, then adjust the value of R63 and/or R60.

 

R68 and R69 are unnecessary.
If you need to change the bias point, then adjust the value of R63 and/or R60.

oh okay thank you very much

 

C21 is unnecessary as well. It's just in parallel with R64 and is probably responsible for the treble roll-off.
Not sure what good the MOSFET current mirror is doing either.

 

C21 is unnecessary as well. It's just in parallel with R64 and is probably responsible for the treble roll-off.
Not sure what good the MOSFET current mirror is doing either.

thank you, the mosfet current mirror was a requirement in the project

 

thank you, the mosfet current mirror was a requirement in the project

How about a PNP long-tailed pair above it, then?