15
3. Closed-loop bandwidth: 1 MHz
4. RC bandwidth: 1/(2
π×
25
×
100x10
-9
)=63.7 kHz
Therefore, the maximum bandwidth is the small-
est of the four, or 955 Hz.
Example 3 (closed-loop-bandwidth-
limited case)
Peak voltage=100 V
Load capacitance=100 pF
1. Slew-rate-limited bandwidth:
111 MHz/100=1.11 MHz
2. Current-limited bandwidth:
0.0191/(100x10
-12
×
100)=1.91 MHz
3. Closed-loop bandwidth: 1 MHz
4. RC bandwidth:
1/(2
π×
25
×
100x10
-12
)=63.7 MHz
Therefore, the maximum bandwidth is the small-
est of the four, or 1 MHz.
Example 4 (RC-bandwidth-limited case)
Peak voltage=1 V
Load capacitance=100 nF
1. Slew-rate-limited bandwidth:
111 MHz/1=111 MHz
2. Current-limited bandwidth:
0.0191/(100x10
-9
×
1)=191 kHz
3. Closed-loop bandwidth: 1 MHz
4. RC bandwidth: 1/(2
π×
25
×
100x10
-9
)=63.7 kHz
Therefore, the maximum bandwidth is the small-
est of the four, or 63.7 kHz.
