When 1 mega Ohm resistors are used?

  1. 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)?
     
  2. jcsd
  3. analogdesign

    analogdesign 798
    Science Advisor

    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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