suria3
Full Member level 5
3-stage op amp
Hi,
I'm designing a 3 stage opamp. The 1st stage is the NMOS differential amplifier, 2nd stage PMOS gain stage and the 3rd stage is PMOS gain stage is well. I have have the gain of 90dB. But the circuit of course not stable as the PM is just 15 deg. I have just done the pole-zero compensation from the 2nd stage output to the 1st stage. So, can you guys guide me what is the proper way of compensation for 3 stage opamp design, is there any good papers available, please pass it here.
Thanks in advance,
Suria
Hi,
I'm designing a 3 stage opamp. The 1st stage is the NMOS differential amplifier, 2nd stage PMOS gain stage and the 3rd stage is PMOS gain stage is well. I have have the gain of 90dB. But the circuit of course not stable as the PM is just 15 deg. I have just done the pole-zero compensation from the 2nd stage output to the 1st stage. So, can you guys guide me what is the proper way of compensation for 3 stage opamp design, is there any good papers available, please pass it here.
Thanks in advance,
Suria