When 1 mega Ohm resistors are used?

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SUMMARY

1 mega ohm (1 MΩ) resistors are primarily utilized in high pass filters for their role in impedance matching and minimizing electrostatic discharge. The choice between a 1 MΩ and a 10 kΩ resistor significantly impacts current flow; while the high pass frequency can remain constant by adjusting the capacitor value, a lower resistance allows for greater current, which is crucial in applications like charge-sensitive amplifiers. Therefore, the selection of resistor value directly influences circuit performance and functionality.

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  • Basic concepts of electrostatic discharge
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Electronics engineers, circuit designers, and students studying filter design and amplifier applications will benefit from this discussion.

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When and "for what purpose"/why are 1 mega ohm (1 MΩ) resistors used in filters, such as high pass filters? Is it with regards to electrostatic discharge or impedance matching?

What difference does it make, if I only use a 10 K ohm resistor, when the high pass frequency will be the same (by changing the value of the capacitor)?
 
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They are used, for example, as a feedback device in charge-sensitive amplifiers. If you use a 10 k Ohm resistor you can have more current that a 1 M Ohm resistor. Sometimes that matters.
 

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