Connect with us

Problem with input voltage on frequecy meter

Discussion in 'General Electronics' started by Bunyano, Nov 25, 2003.

  1. Bunyano

    Bunyano Guest

    Can anyone please help me...I'm building a frequency meter using a
    Infineon c167 microcontroller to accept signals in the range of 0.1Hz
    - 100Mhz. The brief also states that the peak to peak input voltage
    levels vary between 0.1v and 20v. This obviously needs to be stepped
    down to 0 - +5v be accepted by the prescaler circuitry and the
    microcontroller, but if i simply divide it by 4 say, then then lowest
    voltage level would become too small. I also need something that will
    not affect the frequecies being passed through and the impedence which
    needs to stay high...

    I'm just a beginner in this subject and would very much appreciate any
    wisdom anyone could give me on this matter...

    Thanks
     
  2. Look at the limits...

    Amplify the .1 Volt signal up to 5 volts, a MMIC would do the job.
    Clip the higher level signals DOWN to .3 volts which would not over drive
    the MMIC.
    (Schottky diodes back to back.)
    --
    *
    | __O Thomas C. Sefranek
    |_-\<,_ Amateur Radio Operator: WA1RHP
    (*)/ (*) Bicycle mobile on 145.41, 448.625 MHz

    http://hamradio.cmcorp.com/inventory/Inventory.html
    http://www.harvardrepeater.org
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads
Loading...
Electronics Point Logo
Continue to site
Quote of the day

-