deletions | additions       diff --git a/subsection_RF_Parametric_Oscillator_Our__.tex b/subsection_RF_Parametric_Oscillator_Our__.tex  index f10ec9c..c63d34d 100644  --- a/subsection_RF_Parametric_Oscillator_Our__.tex  +++ b/subsection_RF_Parametric_Oscillator_Our__.tex 
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[FIGURE]  The key component in the setup is the frequency mixer, acting as the non-linear amplifier.  We pumped the mixer with AC voltage some DC offset that allowed us to use the mixer as variable attenuator to work as close as possible to the threshold.  Coupling is currently done using another set of mixers that are used as variable attenuators, as shown in the figure.  [FIGURE]    For weak coupling, the evolution matrix is the same as that of the matrix of coupled resonators above.  [MATH]