yefj
Advanced Member level 4
Hello,I am designing a two stage amplifier. my first stage amplies 33dB.
On my second stage i have gm=126u rout=105.2||249K=105.2Ohm ,so its not amplifying at all i have -5 gain.
our gain formula is A_2nd=gm*Rout
if we increase PMOS W our gm rises but our Rout gets smaller ,If we have low PMOS rds then it doesnt matter what is the NMOS RDS because it cancels it in parralel.The diagram of my circuit is attached.
How to make the second stage into 30dB amplifier?
Thanks.
On my second stage i have gm=126u rout=105.2||249K=105.2Ohm ,so its not amplifying at all i have -5 gain.
our gain formula is A_2nd=gm*Rout
if we increase PMOS W our gm rises but our Rout gets smaller ,If we have low PMOS rds then it doesnt matter what is the NMOS RDS because it cancels it in parralel.The diagram of my circuit is attached.
How to make the second stage into 30dB amplifier?
Thanks.