PSPICE Final Project KP and W/L Question
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작성자 Anonymous 댓글 1건 조회 575회 작성일 20-06-24 04:08본문
Assuming KP = uCox, it seems as if PSPICE doesn't follow the KPW/L relation for calculations (eg. gm).
I noticed that changing W and L values drastically changed the output voltage, even though the W/L ratio remained the same.
For example, results of W = L = 100u and W = L = 1u were drastically different, even though W/L is still 1.
Is there an explanation for this behavior?
I tried to change W/L to a more reasonable ratio instead of 1 (eg. 20u/0.18u) because gm is too small with KP = 25E-6 and W/L = 1.
However, the MOSFET seems to behave unexpectedly when changing W and L.
Furthermore, if I change both KP and W/L so that KPW/L is still the same, the output voltage still was drastically affected.
This behavior is causing drastic differences from the simulations with my own calculations
Could someone tell me how to properly use the KP, W, and L values of the PSPICE model to perform the theoretical calculations?
I noticed that changing W and L values drastically changed the output voltage, even though the W/L ratio remained the same.
For example, results of W = L = 100u and W = L = 1u were drastically different, even though W/L is still 1.
Is there an explanation for this behavior?
I tried to change W/L to a more reasonable ratio instead of 1 (eg. 20u/0.18u) because gm is too small with KP = 25E-6 and W/L = 1.
However, the MOSFET seems to behave unexpectedly when changing W and L.
Furthermore, if I change both KP and W/L so that KPW/L is still the same, the output voltage still was drastically affected.
This behavior is causing drastic differences from the simulations with my own calculations
Could someone tell me how to properly use the KP, W, and L values of the PSPICE model to perform the theoretical calculations?
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classTA님의 댓글
classTA 작성일Kp 중 u는 매우 복잡한 함수입니다. 일단, channel length L에도 연관이 있으며, channel의 수직과 수평 Electric field에도 깊은 연관이 있습니다. 자세한 것은 물리 전자 특론 등의 수업에서 다룰 것입니다. 여기에서는 이런 것들 때문에 값이 일정하지 않다는 것을 염두해두시면 될 것 같습니다. 따라서, 회로분석을 할 때 pspice 시뮬레이션이 필요한 이유이기도 합니다.