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MM circuit example - inheriting from the amplifier

Next, we make a specialised kind of amplifier that feeds some of its output back to its input.

object amplifier
    attributes
        input : real
        output: real
    where
        output[t] = 5*input[t].

object amplifier_with_feedback is_a amplifier
    where
        input[0] = 1 &
        (t>0) input[t] = output[t-1].


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