lunren
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Hi guys:
I am working on a LCVCO design. A on-chip LDO will provide power supply for LCVCO. One big problem is that the LDO flick noise affect LCVCO's phase noise a lot. Without LDO, the phase noise is very good, with LDO, the phase noise drops almost by 20dB at the interest frequency range. I am wondering if there is a good solution for this ( I am still prefer to use LDO), or how to beat flick noise?
By the way, according to my AC simulation (LCVCO as load), the integrated noise at the LDO output from 1 to 10GHz is only 64uV. From the noise summary, I could see that thermal noise dominates. However, the pnoise noise summary says that flick noise from diff pair of error amplifier inside LDO dominates. Any explanation for this?
Thanks,
Lunren
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