Synopsys Inc. ($SNPS) is preparing to issue around $10 billion in bonds as soon as next week to finance its $34 billion acquisition of Ansys Inc. ($ANSS), according to people familiar with the matter. The bond sale is part of Synopsys's strategy to fund the significant acquisition in the software industry. Regulatory approval for the Synopsys/Ansys deal appears to be progressing, with Japanese and Taiwanese regulators leaning toward approval. The South Korean authority is expected to make a decision on clearance in the coming weeks, indicating a potential smooth path forward for the merger. In a separate development, Allegro Microsystems Inc. ($ALGM) is drawing takeover interest from its larger competitor, ON Semiconductor Corp. ($ON), according to sources familiar with the situation. ON Semiconductor has been working with advisors in recent months to pursue Allegro, which could lead to further consolidation in the semiconductor industry.