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measuring in-situ slew rate

robin gangopadhya
Intellectual 855 points
Other Parts Discussed in Thread: LF147

I have a situation where we suspect LF147 needs measurement of its actual slew rate. it is used in die-form so I can only access pins taken out of the hybrid pkg. I have access to the most important section: the eror amp.Pin 12 is feeding a rectangular fast rising waveform through 4.99k, 13 to neg side of the signal is 4.99k.  Feedback is 15k+470pf. Output is available through a 100 Ohm. I can vary amplitude. RIse time of pulse is 6ns.

How do I relate  pulse response of this ckt to the slew rate of the opamp ?

thnx

  • 0
    TI__Genius 16890 points

    Hello,

    If you are able to adjust the rise time of the input pulse, you should be able to measure the slew rate of the amplifier.  As you make the input pulse rise time faster there will come a point at which the amplifier output rise time will stay the same and not become faster.  There is an excellent article that describes measuring slew rate at:

    http://www.edn.com/electronics-blogs/the-signal/4415482/Slew-Rate-the-op-amp-speed-limit

    Mike