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9-3: Frequency Conversion
Mixer and Converter Circuits
Singly balanced mixer: A popular mixer circuit using two diodes.
Doubly balanced mixer: This version of the diode balanced modulator is probably the single best mixer available, especially for VHF, UHF, and microwave frequencies.
FET Mixers: FETs make good mixers because they provide gain, have low noise, and offer a nearly perfect square-low response.