Irvine-based Microsemi has acquired Advanced Power Technology, a maker of high performance analog semiconductors and components, in a cash for stock deal. Microsemi will pay $2.00 per share in cash and 0.435 shares of Microsemi common stock for each APT share. APT develops RF products and power switching components for the analog market. Both companies target the defense/aerospace and medical markets. Microsemi said that it expects the transaction to be accretive to its third quarter.