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5MHz signal to DC converter circuit needed

Discussion in 'Electronic Basics' started by SUMNERE, Feb 26, 2004.

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    SUMNERE Guest

    I'm looking for a non-complex way to convert a 5MHZ signal to a dc level with
    little if any ripple. The signal is at 5MHz with amplitude of 0-5 volts. When
    the signal is present a + 2.5 to +5 Vdc output is required. When the 5MHz
    signal disappears a 0 volt output is required.

    Any ideas? Thanks
  2. chris welsh

    chris welsh Guest

    How about some type of F to V converter (or even a rectifier) that drives a
    voltage comparator?
  3. How about a low pass filter?

    Bob Monsen
  4. Bob Masta

    Bob Masta Guest

    You need only a series diode followed by a capacitor to ground, with
    a shunt resistor. When the 5 MHz is present it will be rectified and
    filtered to DC. When it goes away, the shunt resistor will drain the
    capacitor back to zero. Bigger capacitor and/or resistor make for
    less ripple on the DC, but longer response time. Note that you
    need to consider the load resistance of whatever you connect to
    the DC output, since it is part of the shunt.

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
  5. Sounds like a "signal strength meter". Google for that
    and adjust parameters and parts as required.

    Mark L. Fergerson
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