UPDATE 3-Broadcom quarterly profit down as costs rise

(Adds analyst comment, outlook, shares)

By Sinead Carew

NEW YORK, Oct 23 (Reuters) - Chip maker Broadcom Corp (BRCM.O: Quote, Profile, Research, Stock Buzz) posted a 75 percent fall in quarterly profit due to a rise in R&D and litigation expense, and said spending would stay high, sending its shares down more than 12 percent.

Broadcom has been making inroads in the market for wireless baseband chips, the main processor in a cell phone, and said it would invest heavily next year to serve new customers though it does not see substantial revenue from that market in 2008.

Charter Equity Research analyst John Dryden said this meant Broadcom's 2008 profit margin would be significantly weaker than what Wall Street was expecting.

"That doesn't bode well for earnings," he said. "The revenue isn't coming as fast as people wanted to see."

Broadcom said on a call with analysts that it saw a "slightly greater" fall in gross profit margin in the fourth quarter than in the third quarter, when its margin fell 0.3 percentage points to 52.1 percent.

Its shares fell as much as 12.8 percent after that comment to $36.69, from their Nasdaq close of $42.06.

Broadcom, which also makes chips for digital music players and televisions, said its third-quarter net profit fell to $27.8 million, or 5 cents per share, from $110.2 million, or 19 cents a share, a year ago.