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You're right. The author is wrong.
Roy Lewallen, W7EL Clifton T. Sharp Jr. wrote: I'm not sure I was clear on my question. The only nonlinearity I want in my detector diode is the noncontinuous function | Vin when Vin = 0.000000 micronanofemtoattovolts Vout = | | 0 when Vin 0.000000 micronanofemtoattovolts ...while the author seems to be saying that the nonlinearity which exists just above the barrier voltage is essential to detection. He does say, "The slope must be steeper (or shallower) at higher voltages and shallower (or steeper) at lower voltages than at the quiescent operating point." Given my perfect diode and (let's say) a 0.25V peak signal, I contend that my output envelope will be an exact reproduction of the input envelope; but (see his graph #2) his required nonlinearity will seriously distort the output envelope. He seems to be saying that without that, you can't demodulate the signal. I assert that without that, I demodulated it better than he did. |
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