StevenIC: Tips 'n Lifehacks of Design of Analog IC, Mixed-Signal IC (AMS) & RFIC (©Steven)

[Welcome to citing and linking to the pages of this blog] Summary of learning and practice of analog circuit, mixed-signal circuit and RF circuit designs, focused on their integrated circuit (IC) implementations. General knowledge learned from books, papers and practices are summarized. This blog also holds Job Hunting Guide, including interview questions, written by Fuding Ge.

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Sunday, March 28, 2010

Vgs biasing of mosfet

1. The higher Vgs-Vth, the faster the speed, however, the lower gm/Ids;

2. To design a low-power circuit, Vgs shall be lower; for a high speed circuit, Vgs shall be higher. However, Vgs shall not be too high to saturate gm vs. Vgs, due to velocity saturation. When Vgs is too high, gm is saturated (or even reduces a little bit). fT = gm/(2*pi*Cgs). Cgs keeps almost constant when Vgs is high. So fT saturates though burning more current.
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