* Euro dips before Trichet presser; still near 12-week high
* Hawkish ECB, dovish Bernanke could boost euro/dlr further
* Stg at 3-mth high vs dlr as strong data boost rate outlook
(Adds quote, ECB rate decision, updates prices)
By Jessica Mortimer
LONDON, Feb 3 (Reuters) - The euro fell against the dollar on Thursday, with investors booking profits and as markets awaited the European Central Bank's latest comments on inflation after it kept interest rates on hold, as expected.
The euro could rebound if U.S. Federal Reserve Chairman Ben Bernanke, who is due to speak at 1730 GMT, reaffirms the Fed's focus on boosting growth, reinforcing expectations the ECB will raise rates ahead of the Fed.
Analysts said an upward revision to a euro zone services PMI and lower yields at a Spanish debt auction were positives for the euro, but the focus on the ECB's monthly meeting meant the currency barely reacted. [
] [ ]Market players will be looking for further hints on when euro zone rates might rise, given ECB President Jean-Claude Trichet's recent warnings on the need to tackle inflationary pressures. Accelerating inflation and funding problems for peripheral banks are set to top the agenda at the meeting. [
].Trichet's news conference is due to start at 1330 GMT.
"The future trajectory of the euro/dollar rests on Trichet's shoulders," said Kathleen Brooks, research director at Forex.com. "If he picks up where he left off back in January and highlights the upward risks to inflation that would be euro positive and we could see euro at $1.40 in the coming days."
She added that if, on the other hand, he argued the spike in inflation and risks to growth were temporary, the euro could come under pressure.
The single currency shed 0.4 percent on the day to trade at $1.3753 <EUR=>, moving away from a 12-week high of $1.3862 hit on Wednesday though still more than 7 percent above a four-month trough of $1.2860 hit less than a month ago.
Traders said offers were lined up at $1.3830 with talk of an options barrier at $1.3900. Ahead of $1.40, the euro faces resistance around $1.3950, marking the 76.4 percent retracement of its two-month decline to early January as well as its 200-week moving average.
The dollar index <.DXY> was up 0.2 percent at 77.329, not far above a 12-week low of 76.881.
Stephan Maier, currency strategist at Unicredit, said investors may be taking a more neutral position on the dollar after its hefty losses earlier in the week, given the political turmoil in Egypt and the risks of unrest spreading to other Middle East countries.
RISK FACTORS
Some analysts said expectations of hawkish ECB rhetoric may have built too much, leaving room for disappointment and posing downside risks for the euro.
"The market is looking for confirmation of a more hawkish Trichet, though the risk/reward is that there is the potential for disappointment," said Lauren Rosborough, currency strategist at Westpac.
She said further gains could leave the euro on track to test $1.40, but falls due to a more dovish line than expected from Trichet, or from safe-haven dollar buying due to concerns about unrest in Egypt, could push it towards last week's low around $1.3530.
Another risk factor for the euro was an EU summit due on Friday. EU finance ministers agreed last week to take their time over beefing up the euro zone's rescue fund, in a go-slow approach championed by Germany that could test the patience of investors. [
]Euro/dollar implied volatility for one month <EUR1MO=> inched up to 11.85 percent from around 11.45 percent on Wednesday, but one options trader says there had been little interest in topside protection.
Sterling hit a three-month high against the dollar <GBP=D4> of $1.6279 after strong UK services PMI data bolstered the case for higher interest rates. [
]While interest rate differentials are seen playing a big role, one currency pair that has seen a breakdown in correlation with yields is the dollar/yen, which was up 0.13 percent at 81.67 yen <JPY=>.
(Additional reporting by Anirban Nag; Editing by Toby Chopra, Susan Fenton, John Stonestreet)