1Sundaresan K,Allen P E,Ayazi F. Process and temperature compensation in a 7-MHz CMOS clock osctllator[J].Solidstate Circuits IEEE Journal,2006,(02):433-442.doi:10.1007/s00114-010-0720-9.
4Warneke B A, Pister K S J. An ultra - low energy microcontroller for smart dust wireless sensor networks [ J ]. IEEE Int. Solid - State Circuits Conf. Dig. Tech. Papers, 2004:316- 323.
5Flynn M P, Lidholm S U. A 1.2 - um CMOS current controlled oscillator [J ]. IEEE Journal of Solid- State Circuits, 1992(25) :982 - 987.