This week, the ratings of three semiconductor stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

GSI Technology, Inc. (GSIT) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. GSI Technology designs, develops and markets high performance SRAM, or static random access memory, integrated circuits, or ICs, for the networking and telecommunications markets. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Margin Growth and Sales Growth, GSIT also gets F’s. For more information, get Portfolio Grader’s complete analysis of GSIT stock.

This is a rough week for Tessera Technologies, Inc. (TSRA). The company’s rating falls to D from the previous week’s C. Tessera Technologies invests in, licenses and delivers miniaturization technologies for electronic devices. To get an in-depth look at TSRA, 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. The trailing PE Ratio for the stock is 49.70. For more information, 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.