### Summary=

The gamma probe (GPROBE2) is an insertable element that is placed =
on the input and output pins of active devices. When placed, it is invisibl=
e to the circuit so that the through signal path is not disturbed. It calcu=
lates the two reflection coefficients for the node into which they are inse=
rted (Gamma 1 looks to the left and Gamma 2 looks to the right). The reflec=
tion coefficients themselves can be plotted, but the main thing to look at =
is the STAB_GP2 measurement. If this product is greater than 1 at any =
frequency or load / source pull point then the device is unstable. More inf=
ormation on the operation of these probes can be found in the Microwave Off=
ice Users Guide - in the Appendix sections. A paper on stability analysis, =
"Modified S-Probe Circuit Element For Stability Analysis", is available bel=
ow under Downloads.

### Downl=
oads

S_Probe_White_P=
aper.pdf

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