EEE 433- Midterm Exam Guide - Comprehensive Notes for the exam ( 12 pages long!)
Document Summary
Consider the cs amp shown (see cadence tutorial), and draw the following schematic: nmos device size: w = 15 u, l = 300n. The maximum range of input is graphically seen as the voltage curve starts getting clipped beyond a certain value of input. In our case, this occurs between 0. 578 and 0. 6 v. at these values, the output peaks at 2. 5 v. (cid:1006). (cid:1005)) nmo (cid:862)gm(cid:863) curves. When we increase gm by increasing vov, we may cause the transistor to go into triode from saturation, especially when taking into account the ac signal variation. Varying gm with drain current while keeping vd also causes the gain to saturate at higher values of current (due to the square root relation). Increasing id also requires a lot of power. Hence the best way of increasing gm is by keeping id constant while decreasing (w/l), as it also requires lower vov.
