Datasheet

TIME (1 Ps/DIV)
V
OUT
(V)
0.8
0.4
0.0
-0.4
-0.8
LMP7701
LMP7707 compensated
TIME (1 Ps/DIV)
V
OUT
(0.5V/DIV)
0
0
0
uncompensated
compensated
overcompensated
LMP7707, LMP7708, LMP7709
SNOSAW5B –JUNE 2007–REVISED MARCH 2013 www.ti.com
Figure 60 shows the results of the compensation of the LMP7707.
Figure 60. Bench Results for Lead- Lag Compensation
The top waveform shows the output response of a uncompensated LMP7707 using no external compensation
components. This trace shows ringing and is unstable (as expected). The middle waveform is the response of a
compensated LMP7707 using the compensation components calculated with the described procedure. The
response is reasonably well behaved. The bottom waveform shows the response of an overcompensated
LMP7707.
Finally, Figure 61 compares the step response of the compensated LMP7707 to that of the unity gain stable
LMP7701. The increase in dynamic performance is clear.
Figure 61. Bench Results for Comparison of LMP7701 and LMP7707
The application of input lead-lag compensation to a decompensated op amp enables the realization of circuit
gains of less than the minimum specified by the manufacturer. This is accomplished while retaining the
advantageous speed versus power characteristic of decompensated op amps.
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Product Folder Links: LMP7707 LMP7708 LMP7709