Double-sideband modem composed of NE561B
Source: InternetPublisher:奥特man123 Keywords: modem Updated: 2024/08/30
As shown in the figure, it is a double-sideband modulation and demodulation circuit composed of NE561B. The carrier frequency of the input modulation signal of this circuit is f0=1MHz. When the AM modulation signal is added to the input of the multiplier, it is also added to the phase detection circuit through Rv1, CY1, RY2 and CY2, and the frequency of the VCO of the PLL is locked at f0.
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