How much does it cost to have a custom ASIC made?
I have drawn a IC for an RFID application. And I want the IC to be super small. I wonder if there are manufacturers I can go to make it supersmall?
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If you are looking for a semiconductor fabrication house, this begs the question: Approximately how many million units per year would you be paying for?
The IC manufacture business does not generally do one-off designs, nor one-off fabrication runs. There are supposedly "boutique" semiconductor fab houses that do short runs, but if they really exist any more in the current economy, the cost for tooling and fabrication would be pretty steep.
On the benefit-of-doubt that your query is sincere though not well-researched, a clarification on what your design intends to achieve, and the budgets you are thinking of, might help provide some insight, or instead, point you to existing ICs, in supersmall sizes, that might serve your purposes well.
Although it's true that creating a chip is very expensive, TSMC and other fabs do provide "shuttle services" that put many devices from many people on the die and reduce the price significantly. I've even hear a company getting a few samples of it's devices for $1500, which is extremely low when you consider the alternatives. Before anything, it's best to implement as much as possible on an FPGA to ensure the logic is correct, etc etc.
Take a look here: http://www.tsmc.com/english/dedicatedFoundry/services/cyberShuttle.htm