Larry_80
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gm/id methodology is just a way of characterizing your device. So gm/Id is basically an Efficiency measurement for a certain device and can be used as a quick way to obtain various parameters that can be used in design of Op-Amps as mentioned by the poster above. gm/Id in a way can be used as a figure of merit for your device, though this will only take care of parameters like gain etc. Since in Analog design (and Digital), Gain trades with bandwidth, we need to be able to characterize the frequency at which our device will still work as an amplifier and not attenuator, so this requires another type of FOM (figure of Merit) that considers both gm/Id and frequency. Analog design is very interesting and if you really have a passion for it, the sky is the LIMIT.
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