Datasheet
LT1720/LT1721
18
17201fc
APPLICATIONS INFORMATION
Figure 12. 3ns Delay Detector with Logarithmic Pulse Stretcher
5V
–
+
U1A
1/4 LT1721
Y
51Ω*
R8*
4.53k
5V
5V
17201 F12
0.1μF
C1
5.6pF
0.33μF
R9
487Ω*
+
–
U1B
1/4 LT1721
+
–
U1C
1/4 LT1721
X
1V
X
0V
51Ω*
C2
540pF
**
R7
261Ω*
Z
–
+
U1D
1/4 LT1721
301Ω*
R5
1.82k*
R6
301Ω*
5V
R4
30Ω*
R3
1Ω*
V
OFF
R2
1k*
475Ω*
L
301Ω*
301Ω*
RESULT OF X AND NOT Y
+
–
R1
499Ω*
DECAY
CAPTURE
OPTIONAL LOGARITHMIC PULSE STRETCHER (SEE TEXT)
V
C
V
IN
1N5711
DELAY DETECTOR
1V
Y
0V
5V
Z
0V
* 1% METAL FILM RESISTOR
** 270pF s2 FOR REDUCED LEAD INDUCTANCE
Figure 13. Output Pulse Due to Delay of Y Input Pulse