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The Electronics of Radio by David Rutledge

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12Mixers

Mixers shift signals from one frequency to another. In radios, mixers allow us to move a signal from the operating frequency that we use for transmission and reception to an audio frequency that we can hear. Mixers are fundamentally more complicated than amplifiers and oscillators because there are inputs and outputs at several frequencies. Because of the different frequencies that go in and out, mixers need filters to choose the frequencies that we want. Figure 12.1 a shows the schematic symbol for a mixer. It is traditional to call the input the RF signal, for radio frequency. In addition, an oscillator signal, the Local Oscillator, or LO, is applied to the mixer. It is called the local oscillator because it is generated in the receiver ...

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