The overall ratings of three Semiconductor stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Silicon Image (NASDAQ:SIMG) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Silicon Image designs, develops, and markets semiconductor solutions for applications that require high-bandwidth, integrated solutions for high-speed data communications. In Portfolio Grader’s specific subcategories of Equity and Margin Growth, SIMG also gets F’s. Shares of SIMG have dropped 3.8% over the past month, worse than the 3.6% increase for the Nasdaq during the same period. For a full analysis of SIMG stock, visit Portfolio Grader.

Broadcom (NASDAQ:BRCM) earns a D this week, falling from last week’s grade of C. Broadcom makes semiconductors for wired and wireless communications. The trailing PE Ratio for the stock is 25.8. For more information, get Portfolio Grader’s complete analysis of BRCM stock.

This week, NeoPhotonics Corp. (NYSE:NPTN) drops from a C to a D rating. NeoPhotonics designs, manufacturers, and markets standard and semi custom planar light wave circuits for metro access and other advanced optical communications platforms. The stock receives F’s in Earnings Growth, Earnings Momentum, and Equity. Cash Flow and Margin Growth also get F’s. To get an in-depth look at NPTN, get Portfolio Grader’s complete analysis of NPTN stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.