This week, 13 Semiconductors & Semiconductor Equipment stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Cirrus Logic, Inc. (CRUS) boosts its rating from a B to a A this week. Cirrus Logic, Inc. is a developer of high-precision, analog, and mixed-signal integrated circuits (ICs) for the audio and energy markets. The company also gets A’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of CRUS stock.

Inphi Corporation’s (IPHI) ratings are looking better this week, moving up to a A from last week’s B. Inphi Corporation provides high-speed analog and mixed signal semiconductor solutions for the communications, datacenter, and computing markets worldwide. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of IPHI stock.

Taiwan Semiconductor Manufacturing Co., Ltd. Sponsored ADR (TSM) gets a higher grade this week, advancing from a B last week to a A. Taiwan Semiconductor Manufacturing Co., Ltd. Sponsored ADR makes semiconductors based on its own or third-party proprietary integrated circuit designs. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of TSM stock.

This week, Fairchild Semiconductor International, Inc.’s (FCS) ratings are up from a B last week to a A. Fairchild Semiconductor International, Inc. is a global supplier of high performance products that minimize, convert, manage and distribute power for multiple end markets. The company also gets A’s in earnings growth. For more information, get Portfolio Grader’s complete analysis of FCS stock.

Chipmos Technologies (Bermuda) Ltd. (IMOS) shows solid improvement this week. The company’s rating rises from a C to a B. Chipmos Technologies (Bermuda) Ltd. provides semiconductor testing and assembly services for LCD and other flat-panel display driver semiconductors, and memory and logic/mixed-signal products. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of IMOS stock.

This is a strong week for Tower Semiconductor Ltd (TSEM). The company’s rating climbs to B from the previous week’s C. Tower Semiconductor Ltd an independent semiconductor foundry, manufactures analog intensive mixed-signal semiconductor devices in the United States, India, the Asia Pacific, Europe, and Israel. The company also gets A’s in sales growth, earnings growth, earnings revisions, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of TSEM stock.

The rating of NeoPhotonics Corporation (NPTN) moves up this week, rising from a B to a A. NeoPhotonics Corporation designs, manufacturers, and markets standard and semi custom planar light wave circuits for metro access and other advanced optical communications platforms. The company also gets A’s in sales growth and earnings surprise. For more information, get Portfolio Grader’s complete analysis of NPTN stock.

Trina Solar Ltd. Sponsored ADR (TSL) is seeing ratings go up from a C last week to a B this week. Trina Solar Ltd. Sponsored ADR designs, develops, manufactures and sells photovoltaic modules. The company also gets A’s in sales growth, operating margin growth, earnings growth, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of TSL stock.

Exar Corporation (EXAR) earns a B this week, jumping up from last week’s grade of C. Exar Corporation designs, develops, and markets analog and mixed-signal integrated circuits for use in communications and video and imaging products. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of EXAR stock.

This week, Amkor Technology, Inc. (AMKR) pushes up from a B to a A rating. Amkor Technology, Inc. provides outsourced semiconductor packaging and test services in the United States and internationally. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of AMKR stock.

Siliconware Precision Industries Co., Ltd. Sponsored ADR (SPIL) improves from a B to a A rating this week. Siliconware Precision Industries Co., Ltd. Sponsored ADR provides semiconductor packaging and testing services. For more information, get Portfolio Grader’s complete analysis of SPIL stock.

This is a strong week for Advanced Semiconductor Engineering, Inc. Sponsored ADR (ASX). The company’s rating climbs to B from the previous week’s C. Advanced Semiconductor Engineering, Inc. Sponsored ADR is an independent provider of semiconductor packaging and testing services. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of ASX stock.

Lattice Semiconductor Corporation’s (LSCC) ratings are looking better this week, moving up to a B from last week’s C. Lattice Semiconductor Corporation designs, develops, and markets high speed programmable logic devices. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of LSCC 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.