This week, the overall grades of three semiconductor stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, GSI Technology, Inc. (GSIT) falls to a D (“sell”), worse than last week’s grade of C (“hold”). GSI Technology designs, develops and markets high performance SRAM, or static random access memory, integrated circuits, or ICs, for the networking and telecommunications markets. The stock also earns F’s in Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Margin Growth and Sales Growth. To get an in-depth look at GSIT, get Portfolio Grader’s complete analysis of GSIT stock.

The rating of Tessera Technologies, Inc. (TSRA) slips from a C to a D. Tessera Technologies invests in, licenses and delivers miniaturization technologies for electronic devices. For more information, get Portfolio Grader’s complete analysis of TSRA stock.

Micrel, Incorporated (MCRL) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a D (“sell”). Micrel designs, develops, manufactures and markets a range of high-performance analog power integrated circuits, mixed-signal and other products designed to address a range of end markets including cellular handsets, portable computing, enterprise and home networking, wide area and metropolitan area networks, digital televisions and industrial equipment. The stock gets F’s in Earnings Surprise, Margin Growth and Sales Growth. Shares of the stock have been exchanging at an usually rapid pace, twice the rate of the week prior. The stock currently has a trailing PE Ratio of 51.60. To get an in-depth look at MCRL, get Portfolio Grader’s complete analysis of MCRL 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.