How is the maximum inductor value in a technology process is determined

[circuitking]

Hi I came to know that the maximum value that can be achieved in a technology process is restricted. Could someone eloberate on this. How would I know what is the maximum inductor value that can be designed using a particular technology (PDK). Thanks in advance.

 

[BigBoss]

Only PDK Supplier can answer this..There must be max limits..

 

[dick_freebird]

One limit is the series resistance of the spiral, and
somebody in the foundry design group might pick
a number from an unspecified orifice and declare
it a limit.

If you need Q then you're going to be looking at
smaller inductors (or maybe MxN of them?). I do
not know whether people who do know, play with
arrayed inductors as an alternative to big singles.

If you only look at L value then

 

[Anomis]

Hi I came to know that the maximum value that can be achieved in a technology process is restricted. Could someone eloberate on this. How would I know what is the maximum inductor value that can be designed using a particular technology (PDK). Thanks in advance.

Here are some typical values of inductors as well as Q and peak freq in 65nm PDK, Let take a look at it to get more insight of real world process. In essence, the foudary does not recommend us to design with such a high inductance (if > 10 nH, you are supposed to employ off chip inductor for better perfomance) rather than those given in this table because of their low Q.

Have fun !!