choose r1 and r2

Discussion in 'Homework Help' started by Henk, Apr 26, 2009.

  1. Henk

    Thread Starter New Member

    Mar 28, 2006
    5
    0
    I want to design an inverting amplifier. I am given:

    - input resistance minimum and output resistance maximum.
    - r1 and r2 at least 1kohms as I outmax is 10ma.

    what is the principle to choose values for r1 and r2.

    tanks :)
    henk
     
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    You have not given nearly enough information. You need to post a schematic.
     
  3. Henk

    Thread Starter New Member

    Mar 28, 2006
    5
    0
    the schematic looks like the attached two image files. I couldn't find any info in many resources that i have searched in the way we are asked to solve this problem.

    any ideas would be appreciated.
    henk
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The voltage gain of the inverting opamp circuit is R2/R1. So if R2 is 100k and R1 is 10k then the voltage gain is 10. The input impedance will be 10k ohms. The output impedance will be less than 0.01 ohm at low frequencies.
     
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