<https://www.edaboard.com/threads/whats-wrong-with-this-bias-circuit.87461/>
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"Hi all: I am a fresh man to design OPA, After I reading this two paper \n1.\"Design Procedure for Two-Stage CMOS Operational Amplifiers Employing Current Buffer\" Jirayuth Mahattanakul, IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS 2005, November, 2005..."
<https://www.edaboard.com/threads/whats-wrong-with-this-bias-circuit.87461/>