LT1097
APPLICATIONS INFORMATION
The availability of the compensation terminal permits the use
of feedforward frequency compensation to enhance slew
rate. The voltage follower feedforward scheme bypasses the
amplifier’s gain stages and slews at nearly 10V/µs.
The inputs of the LT1097 are protected with back-to-back
diodes. In the voltage follower configuration, when the
input is driven by a fast, large signal pulse (>1V), the input
protection diodes effectively short the output to the input
during slewing, and a current, limited only by the output
short circuit protection will flow through the diodes.
The use of a feedback resistor, as shown in the voltage
follower feedforward diagram, is recommended because
this resistor keeps the current below the short circuit limit,
resulting in faster recovery and settling of the output.
Follower Feedforward
Compensation
50pF
Pulse Response of Feedforward
Compensation
10k
5V/DIV
2
100Ω*
3
2
5k
IN
–
LT1097
6
5
OUT
3
+
0.01µF
LT1097•F03
TYPICAL APPLICATIO
Low Power Comparator with <10µV Hysteresis
5V
330k
1k
100k
OUT
1
LT1097
3
620k
6
100k
2N3904
10k
+IN
10k
–IN
10
U
W
U
U
U
Test Circuit for Offset Voltage and
its Drift with Temperature
50k*
15V
–
+
7
LT1097
4
–15V
6
V
O
50k*
5µs/DIV
1097 G20
V
O
= 1000V
OS
*RESISTORS MUST HAVE LOW
THERMOELECTRIC POTENTIAL
LT1097•F04
7
2
–
+
4
–5V
LT1097•TA02
LINER [ LINEAR TECHNOLOGY ]
