need explanation ?

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eng_alaakaa

Joined Sep 21, 2011
12
for this design of envelope detector ,
1- what's the function of D2.
2- why the output signal is inverted.
see attached pic.
 

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tgotwalt1158

Joined Feb 28, 2011
110
The D2 is used as positive peak clamper and hence the out put appears as inverted that is with positive peak clamped to zero volt.
 

Wendy

Joined Mar 24, 2008
21,839
The direction of the diodes will determine which way the peak voltage goes.

When designing a demodulator like this, be sure the capacitors don't short the audio but do short the RF. It is a common mistake.
 

SgtWookie

Joined Jul 17, 2007
22,201
They really should have used a small Schottky diode, like a BAT54. The BAT54's Vf is far lower than 1N4148/1N914 switching diodes.
 
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