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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.
 

    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.
 

    STOIKOV

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