Frequency converter

Alternate uses

Frequency converter may also refer to a much-lower-powered circuit that converts radio frequencysignals at one frequency to another frequency, especially in a superheterodyne receiver. See frequency mixer. The circuit usually consists of a local oscillator and frequency mixer (analog multiplier) that generates sum and difference frequencies from the input and local oscillator, of which one (the intermediate frequency) will be required for further amplification, while the others are filtered out. The same result was achieved historically by the pentagrid converter or a triode and hexode in a single tube, but can be implemented in transistor radios economically by a single transistor functioning as a self-oscillating mixer.