Re: Interesting Armstrong AM detector circuit.
Unless I haven't fully understood the explanation of Geiler's voltage doubler detector in the article above, this circuit will still suffer from distortion caused by the R.C. time constant of the load.
I expect that the performance of the British 405 television sound AM detector was much better than that of broadcast radio receivers because the high IF frequency would have allowed a much lower value capacitor in the diode load.
No doubt the detector performance in a radio could be improved by up-converting the I.F. to a much higher frequency; a rather expensive solution however.
|