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![]() "Richard Clark" wrote in message ... On Mon, 1 Sep 2003 14:12:08 -0400, "Tarmo Tammaru" wrote: In general, the addition of negative feedback to change the output impedance does not change the dynamic range. Hi Tam, H.W. Bode, of Bell Labs, developed a body of work that proves you completely wrong. Negative feedback enhances every facet of amplifier design and to claim otherwise is wholly misinforming. 73's Richard Clark, KB7QHC Hi Richard, Everything, except the output dynamic range. Please go through my numbers. The equation I gave is for the point at which the amplifier goes non linear, and there actually is no feedback. There is a large error voltage at the input, but the amp can't do anything about it because it is already in saturation. For a 5V input/output and a 1K load the output terminal of the op amp is already at VCC. A more practical example might have been a 13.8 volt power supply regulator running off 16 volts, with a current sensing resistor in series with the output. Anyway, it was a rainy afternoon kind of thing. Tam/WB2TT |
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