Please let me know about the maximum turns ratio I can expect from an on chip transformer and any limitation such as frequency for voltage conversion. I have read that the efficiency of on-chip transformer depends on the frequency of operation as well.
Turns ratio, is applied to same frequency, electrical transformer, having separate primary and secondary, working on induction principle. Variable frequency. frequency to voltage converter IC chip, cannot be considered as electrical transformer....
for convenience of analysis a ratio of 1: 3 or 1: 4 can be considered
Dear Sir,
I dont know about the turns ratio.
The problem with DC-DC convertor with on-chip inductor is as follows:
- To have high efficiency, you need a coil with high Q factor to keep the coil losses down.
- On the other side, you want low switching frequency in order to keep the gate losses of the MOS transistors down.
Now, usually, the 2 are not compatible. On chip inductors only have decent Q for frequencies above 1 Ghz, but this is quite high to keep the switching losses down. So, usually, the result is poor efficiency.
I think if you want to make a design, you need to look at inductor libraries (TSMC, global, smic), or make your own inductor, and then design the convertor around it.
Best Regards,
Henri.
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