The IPO for WiFi chipmaker Quantenna has been a long time coming and there were times when we did not think it would get there, believing that a cash burn which sent it headlong into a $79 million deal with a Russian bank in 2012, might mean that other funders were too shy to take on further risk. In the end the company has taken on board $187 million in funding, and needed to come up with a value north of $500 million in order to bring a decent VC return on a long investment, which this IPO just about achieves. Effectively it is asking for $100 million, net of costs, which it will get if it sells 6.7 million…