circuitking
Full Member level 5
Hi, I am reading this paper on MOSFET bandwidth https://www.ece.ucsb.edu/Faculty/rodwell/Classes/ece2c/labs/Steininger.pdf.
I have few questions
1. For figure 4, the small signal equivalent was drawn in Figure 5. I don't understand why the dependent current source of M3 is not included in figure 5 and why gm1/wT (Cgs of M1) is included two times (second time at the output).
2. I know that in compared with single stage, gain increases and bandwidth decreases in a multi-stage. But here it was said that "To obtain an amplifier with the highest possible bandwidth, we would like to cascade stages of low gain" and "It is possible to show that there is an optimum stage gain for a cascade of identical amplifiers that maximizes the overall bandwidth". Can someone explain this clearly.
I have few questions
1. For figure 4, the small signal equivalent was drawn in Figure 5. I don't understand why the dependent current source of M3 is not included in figure 5 and why gm1/wT (Cgs of M1) is included two times (second time at the output).
2. I know that in compared with single stage, gain increases and bandwidth decreases in a multi-stage. But here it was said that "To obtain an amplifier with the highest possible bandwidth, we would like to cascade stages of low gain" and "It is possible to show that there is an optimum stage gain for a cascade of identical amplifiers that maximizes the overall bandwidth". Can someone explain this clearly.