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Dual JFET Arithmetic Product Wave Detector Circuit

2014-11-24 23:52  
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Dual JFET Arithmetic Product Wave Detector Circuit
In the picture, it uses a couple of differencial signal junction type FET (JFET) to generate the arithmetic product wave detection. The SSB signal is added to the Q1's grid electrode. The local oscillator is used to interrupt the circuit in the Q2 side. It should note that the local oscillator's signal amplitude is much stronger than the SSB signal. The two tubes' common drain electrode circuit is connected to a low-pass filter and then it connects the output port. The filter is adjusted to the spectra which is needed to be overlayed (usually it is the audio frequency). The picture shows the dual JFET arithmetic product wave detector circuit.