RF frequency converter
A frequency converter is a circuit which generates a useful output frequency which is the sum or difference of the input frequency and the frequency of another signal, usually derived from a local oscillator. In a microwave system, it is essential for a microwave system or radar system to include a frequency converter or mixer for converting an intermediate frequency (IF) signal into a radio frequency signal or vice versa. A frequency converter can be used to demodulate an RF signal, such a circuit being sometimes referred to as a mixer. Frequency converter circuits are typically implemented as analog multiplier circuits and are used in many different applications such as modulators, demodulators, upconverters, downconverters and mixers. They are used for converting an RF signal, transmitted over the air medium, to a lower frequency signal suitable for demodulation in a receiver.
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