Shares of Silicon Labs ( SLAB) were among technology's losers Monday, falling 9% after the chipmaker posted lower first-quarter earnings, even though the results topped Wall Street's expectation.

The company earned $11.1 million, or 19 cents a share, on revenue of $114.5 million. Excluding certain items, the company earned $19.2 million, or 33 cents a share. Analysts polled by Thomson First Call expected earnings of 32 cents a share, before items, on revenue of $112.6 million. A year earlier, Silicon Labs earned $17.4 million, or 31 cents a share, on revenue of $104.8 million. Excluding items, the company earned $16.4 million, or 30 cents a share, during the year-earlier quarter.

For the second quarter, Silicon Labs forecast revenue of $116 million to $120 million, in line with the $117.2 million that analysts project. Shares were trading down $4.92 to $51.31.

Camtek ( CAMT) shares jumped 13% after the company lifted its first-quarter revenue guidance. The company, a maker of optical inspection systems for the semiconductor industry, now sees revenue of $24.5 million to $25 million. Camtek's earlier forecast called for a top line of $22 million to $24 million. "These results derived from strong performance in the PCB market that exceeded our previous estimates, and from the continuing growth of our sales to the semiconductor industry," the company said.

For the second quarter, Camtek predicts revenue of $26 million to $29 million. The company plans to release its first-quarter results on May 16. Shares were trading up 66 cents to $5.55.

Shares of Wireless Facilities ( WFII) rose 3% after the wireless infrastructure company said it received federal contracts worth about $29 million. "Highlights of the first-quarter awards include two unannounced contract-ceiling increases totaling more than $22 million for continued support for aerial and surface targets for the Naval Air Weapons Station at Point Magu and for continued engineering services at the Pacific Missile Range Facility in Hawaii," the company said. The agreements range from one month to two years. Wireless Facilitites also received a $7 million increase in a base-period ceiling for its contract with the Space and Naval Warfare Systems Center in San Diego. The increase brings the total value of the San Diego contract to about $35 million. The company's shares were trading up 12 cents to $4.37.

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