3. Elementary operations and circuits
Synthesizers use a few elementary circuits to perform frequency transformations. In a complete device, these different circuits can be used together.
3.1 Frequency addition and subtraction
A mixer is a non-linear device that realizes the product of the signals present at its input ports (figure 8 ). When the frequency of these signals is ν 1 and ν 2 respectively, a voltage proportional to :
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Elementary operations and circuits
Direct digital synthesis
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