"I can see it propelling the dollar higher still, even though people think it's a crowded trade.
Overall, dollar sentiment remained positive as worries about rising interest rates and geopolitical tensions unsettled investors, while the yen hovered near the level that prompted last month's intervention.
In afternoon trading, the U.S. dollar index rose 0.2% to 113.25, not far from a 20-year high of 114.78 it touched late last month.
The dollar touched a three-week high against the yen of 145.895 , just shy of the 24-year peak of 145.90 hit before the Japanese government stepped in to prop it up three weeks ago.
Meanwhile, the risk-sensitive Australian dollar hit a 2-1/2-year low of $0.6248 and was last down 0.4% at US$0.6270.