# sky130

Emmanuel Innocent

04/27/2023, 8:29 PM
Hello everyone! Please I'd like to make a request. I'm an undergraduate currently in my senior year. I recently learnt about amplifier design using the gm/Id method. Yes, I understand the motivation and merit of the gm/Id method. However, I'd still like to get a feel of the practical use of it in amplifier design. I'd like a step by step walk through of a single stage op amp design using the gm/Id approach. I'd like to see how the method can be used to design a differential amplifier with active load and biasing (current mirrors) from specifications to hand calculation(I'm aware look-up tables/charts would be utilised) design using the 180nm technology. After I must have learned from the practical walk through, I'd then design my own opamp with different specifications using the method and I'd simulate it on SPICE for verification. I'd be glad to practically apply this method myself. Coming from the sqaure-law background there is really a lot of information in the gm/Id approach. I've studied some papers and lecture notes and I've grasp the motivation of the method but I want to use it practically in amplifier design. Thank you for your consideration.

Charly Meyer

05/09/2023, 3:51 PM
Hello! You can watch this video, it will probably help you. Unfortunately, it is in French, but you can see the formulas (formulas are in math 🙂 )

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Emmanuel Innocent

06/03/2023, 7:00 PM
Thank you very much for the video. Please how did he get the values for the gds of the transistors used in the gain formula?