Radio Frequency Circuit Design, 2nd Edition

APPENDIX H

Single-Tone Intermodulation Distortion Suppression for Double-Balanced Mixers

An expression is given in [1] for the suppression for single-tone intermodulation distortion in a double-balanced mixer. This is repeated below as well as coded in the program IMSUP. The intermodulation suppression in dBc (dB below the carrier) is S_nm for a set of frequencies nf_p ± mf₁:

(H.1)

The difference in dB between the RF signal and LO power is ΔP.

(H.2)

(H.3)

The value for V_f in Eq. (H.2) is the ratio of the forward saturation diode voltage, V_sat and the peak LO voltage, V_L. Thus,

(H.4)

The ...