I am considering at which point an electronic circuit-based product becomes patentable. If I were to simply design a new electronic circuit by implementing a single integrated circuit (IC) from a manufacturer, I would think that this cannot be patentable. I would also presume that the IC manufacturer has some kind of patent on their own IC. In this case, I would suppose that there is no patentable product and therefore you can sell this product without needing to worry about patent law.
But, what about when you combine two ICs that work together to do something than one of the ICs cannot do on its own? At this point, assuming it is novel, useful, nonobvious, and not previously patented, is this patentable? Do I need to begin searching to see if someone else has patented that combination of two ICs before I begin productising an invention? Fundamentally, I would like to understand if combining ICs in a certain way leads to something that is patentable, or is something more complex required?