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AN4587 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN4587
Description  Input bias current of a chopper amplifier
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4587 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN4587
2/14
DocID026923 Rev 1
Contents
1
What causes Iib spikes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
Charge injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2
Clock feed through . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Inpact of input current spikes on real applications . . . . . . . . . . . . . . . . 8
2.1
High impedance input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2
Filter input current spikes thanks to a common mode capacitor . . . . . . . . 9
3
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13


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