Question on circuit to generate power supply noise

[twlin1]

power supply noise

The attached file is a circuit to generate power supply noise (white noise).
It comes from the paper "The effect of power supply noise on ring

oscillator phase noise" by Merrick Brownlee, Pavan Kumar Hanumolu, Un-

Ku Moon, and Karti Mayaram.

My question is that how to realize "triangle" block.
Does anybody provide and ideas?

Thanks.

 

[Siniša]

You can run BE connection of NPN transistor with inverse current . Amplify signal to desired level and you will have required white noise.

 

[FvM]

The "triangle" blocks are simply buffers or voltage followers, cause R0 is generating the noise.

 

[twlin1]

To Sinisa:
I don't catch it. Would you explain it more detail?

To FvM:
If I use buffers or voltage followers, it would be drawn current and be like a "regulator". I guess it would even have better PSR, and don't get what I need. Or can you also explain it?