Lect. 24: High-Frequency Response of MOSFET CS
Lect. 24: High-Frequency Response of MOSFET CS
Lect. 24: High-Frequency Response of MOSFET CS
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
<strong>Lect</strong>. <strong>24</strong>: <strong>High</strong>-<strong>Frequency</strong> <strong>Response</strong> <strong>of</strong> <strong>MOSFET</strong> <strong>CS</strong><br />
Determine f H for the <strong>CS</strong> shown left.<br />
I REF =100μA, W/L=7.2μm/0.36μm<br />
/0 k n ’=387μA/V 2 , k p ’=86μA/V 2 ,<br />
r o1 =18kΩ, r o2 =22kΩ<br />
C gs =20fF, C gd =5fF, C L =25fF, R sig =10kΩ.<br />
It can be shown<br />
R<br />
τ<br />
gs = C gsR<br />
gs<br />
= 200ps<br />
τ = C R = 714ps<br />
τ<br />
gd gd gd<br />
C L C<br />
L<br />
= C R =<br />
L<br />
= R = 10kΩ<br />
gs sig<br />
'<br />
gd sig<br />
1 m L L<br />
142.8k<br />
'<br />
( g<br />
)<br />
R = R + g R + R = Ω<br />
R<br />
C<br />
<strong>24</strong>6ps<br />
τ = τ + τ + τ = 1160ps<br />
f<br />
H gs gd C L<br />
H<br />
L<br />
= R = 9.82kΩ<br />
1 1<br />
= = = 137 MHz<br />
−12<br />
2 πτ 2 π × 1160 ×<br />
10<br />
H<br />
'<br />
L<br />
Electronic Circuits 1 (09/2)<br />
Pr<strong>of</strong>. Woo-Young Choi
Change language