In oscillator design,What is condition for S11 if it is a 2port negative resistance design?
Answer:
The oscillation will start, if both conditions are fulfilled
• Mag [S11] >1 at the desired oscillation frequency
• Ang [S11] is close to 0°degree at the desired oscillation frequency.
S11 can be monitored in the extended Smith chart. S11 at the desired SAWR is placed in the extended Smith chart part (S11>1) and close to the center line of the Smith chart.
The phase of S11 is > 0° below, and < 0° above oscillation frequency. Tune the component values to fulfill these conditions.
[ "Smith Chart: http://en.wikipedia.org/wiki/smith_chart... ]
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