The Short-Circuit
The MOSFET Unity
Gain Frequency
Consider the short-circuit current gain of the high-frequency MOSFET small-signal model:
Note that because of the output short, [pic], so that [pic].
Therefore:
[pic]
and
[pic]
The short-circuit current gain of the MOSFET is thus:
[pic]
Note that this is not a low-pass function! Therefore, there is no “break” frequency associated with this frequency response.
However, there is a “unity gain” frequency [pic]—it’s the frequency where the short-circuit current gain is equal to one:
[pic]
Therefore we find that the unity-gain frequency of a MOSFET is:
[pic]
Note as the capacitances get smaller, the unity gain frequency gets larger. The unity gain frequency is a MOSFET device parameter—the larger the value, the better the MOSFET high frequency performance.
-----------------------
+
vgs
-
G
D
S
+
vds
-
S
+
_
[pic]
[pic]
[pic]
[pic]
[pic]
[pic]
[pic]
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.
Related searches
- short thought for the day
- short funny quotes for the workplace
- short quote of the day
- etfs that short the market
- best way to short the s p 500
- jokes of the day short funny jokes
- short summary of the holocaust
- the bully short story
- short jokes of the day
- the best short inspirational quotes
- short positive quotes for the workplace
- how short was the shortest person