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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> How to design opamps with less specs https://designers-guide.org/forum/YaBB.pl?num=1156929432 Message started by avlsi on Aug 30th, 2006, 2:17am |
Title: How to design opamps with less specs Post by avlsi on Aug 30th, 2006, 2:17am Hi all, This seems to be funny. But I have a reason, all these days I was getting specs and was designing opamps. They were enough to know my W/L. Now, I am facing a problem of generating specs and designing. Let me tell u in detail. I need to design an opamp with the follwoing specs in 0.18 um technology Open Loop Gain 90 dB Phase Margin 60 degrees - I assumed ( no specs) Unity Gain Frequency 1 M Hz - I assumed ( no specs) ICMR 0.8-1.6 OCMR 0.15-1.65 VDD =1.8 Cload = 25 p F RLoad = 1 Mega Ohm The biggest problem, I am operating my system @ DC. So, I am not bothered about AC behaviour settling time. Slew rate is also not that important I donot know how to decide the currents. I am designing a two stage miller opamp. Please help me on this. Thanks in advance. |
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