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AN4071 Fiches technique(PDF) 21 Page - STMicroelectronics

No de pièce AN4071
Description  Introduction to comparators, their parameters and basic
PDF  27 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4071 Fiches technique(HTML) 21 Page - STMicroelectronics

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AN4071
Hysteresis
Doc ID 022939 Rev 1
21/27
Figure 25.
Zoom of the signal (green OUT, blue IN+), time scale 20 ns/div.
Main general contributors leading to device oscillation
●
Parasitic capacity/inductance onboard: long narrow wires, signal and output track close
together, device plugged into socket
●
Fast (sharp) output edges: faster edge means higher dV/dT and therefore bigger
impact of parasitic capacities and inductances on the board
●
High impedance on input pins: sensitivity to noise, increased effect of parasitic
structures and signal crosstalk
●
Poor grounding
●
High power supply impedance: inappropriate or missing bypass capacitor
●
No hysteresis (static or dynamic) implemented
●
Use of high-speed comparator where it isn't necessary.



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