After plunging on an analyst downgrade Wednesday, shares of Inphi (IPHI) have recovered and are trying to find support at the 10-week moving average. The rebound left the stock in a follow-on buy area. Upside volume, however, hasn’t matched the intensity of trading in Wednesday’s plunge, when shares slid as much as 10%. The stock did trim losses, closing only 5% lower, but it sank back toward the 50-day line Friday.