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problem understanding Rotary Traveling-Wave Voltage Controlled Oscillator principle

yefj

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Hello, I am trying to understanf the following sturture in the thesis link shown bellow.
i know that cross back coupled pair oscilator generates a sine wave .
-Gm is cancelled with tank resistance to get the barkausen condition.
Ho does this combination of ring transmission line and oscilator structure work together to get the desired result?
Thanks
1681421798317.png
 
Hi,

the trave wave in the transmission line ring goes in the ring loop. But there is loss in the ring loop. The cross coupled pair compensate the resistance loss to maintain this traveling wave running in the loop. So you can imagine if this ring is made of superconductor. The wave will travel in the loop forever.(In a lossy ring, We just need continuous give it energy)
 

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