Balanced mixer
Balanced mixer a nonlinear 3-port device (two inputs, one output) used to translate an input signal’s frequency component either up or down the frequency spectrum by generating the sum and difference of two or more frequencies present at its inputs. The three ports are termed rf (radio frequency), lo (local oscillator), and if (intermediate frequency). A balanced mixer translates the frequency components found in the rf input signal to the if output in such a manner as to minimize the amount of lo noise arriving at the if. This reduces the mixer’s overall noise figure and increases its sensitivity. Other advantages of these mixers include improved local oscillator isolation and linearity and higher power handling ability.
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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