While the semiconductor world comes to terms with what would be the biggest tech acquisition in history as Broadcom circles Qualcomm, WiFi chip maker Quantenna Communications posted record revenue for the third quarter of $50.1 million, growing 50% from the previous year on the back of strong shipments of Wave 2 offerings and legacy 802.11n products. Yet guidance for the next quarter caused Quantenna’s stock price to tumble as much as 35.4% in trading this week, as the company laid out a grim outlook for the next quarter – triggered by the delayed deployment of 10 Gbps wireless chips at a “key service provider.” Investor site The Motley Fool, which owns shares in Quantenna, reports that this large cable MSO…