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9-3: Frequency Conversion
Mixer and Converter Circuits: Diode Mixer
The input signal is applied to the primary winding of the transformer.
The signal is coupled to the secondary winding and applied to the diode mixer, and the local oscillator signal is coupled to the diode by way of a capacitor.
The input and local oscillator signals are linearly added and applied to the diode, which produces the sum and difference frequencies.
The output signals are developed across the tuned circuit which selects the difference frequency.