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       IMD calculations for Mixers with MIXERSPURS data tables           


IMD calculations for Mixers with MIXERSPURS data tables

When a carrier mixes with the local oscillator frequency in a mixer, intermodulation and harmonic frequency components will be generated at the output of the mixer. These harmonic frequency components are called Mixer Spurs.

Generally, mixing can produce energy at all frequencies equal to:

where:

fRF is the frequency of the carrier at the input of the mixer

fLO is the frequency of the local oscillator

NRF and NLO are integers representing the RF and LO multipliers respectively.

 

You can control how many spurs get generated by specifying the MAXORDER, MINF, MAXF, and MINP parameters for each mixer, where:

MAXORDER: maximum order of spurs, MAXORDER

MINF: minimum spur frequency, i.e., spurs below MINF are ignored

MAXF: maximum spur frequency, i.e., spurs above MAXF are ignored

MINP: minimum spur power, i.e., spurs below MINP are ignored

 

The spur’s power at the output of a mixer is calculated using the MIXERSPURS data table provided for this mixer. Once generated, each spur is carried through the remainder of the system with all mismatches taken into account. (For more information about the MIXERSPURS data table, refer to documentation on the three-port mixer model MIXER3P). Essentially the rows represent relative power levels for harmonic RF multipliers and the columns represent relative power levels for harmonic LO multipliers. The image power level can also be specified.

It is always assumed that mixer spur tables are obtained at the output IF port when the RF and IF ports of a mixer are both terminated in 50Ω and a single-tone RF source (with a given frequency and available input power) is applied to the mixer’s RF port.

 



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