That was the magic. Most textbooks spent ten pages deriving the physics of the subthreshold region. Sansen gave her a single, bolded sentence: “In weak inversion, gm/ID is maximum. Your battery will love you.”
She had seen that formula before. But Sansen added the secret: “For power efficiency, keep Vov small. For speed, keep Vov large. Pick one.” willy sansen analog design essentials pdf
She learned from Chapter 5: “For 1% matching, make your transistor area 10,000 square microns.” No complex statistics. Just a rule of thumb that worked. That was the magic
Sansen’s slide was brutal: “Every transistor you add doubles your distortion. The best analog designer removes transistors, not adds them.” Your battery will love you
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