Question about mixers' output spectrum

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STOIKOV

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why in an output spectrum of a mixer (IF port),
the component (VRF-VLO) is greater in amplitude than the component (VRF+VLO)
Is it right or must be equal ?
 

This is intentionally done in the design. The IF port frequency response is lower (sometimes going to DC) than the RF or LO port frequency range.
 

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    STOIKOV

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well I mean, in terms of amplitude (not frequency), the addition of the two input frequencies ωRF+ωLO is lower than the difference ωRF-ωLO in a downconverter. Is this correct or both amplitudes should be similar ?
 

Theoretically, they should be the same. However, due the nature of the frequency response of the circuit, the difference frequency component is usually larger than the addition of the two frequency.
 

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