Abstract: A method for determining whether to trigger a reset of a delay locked loop (“DLL”) comprising calculating the difference in time between a reference clock and a delay clock; comparing the difference in time to the amount of time required for a reset signal to reset said DLL; and generating the reset signal to reset the DLL if the reset time is less than the difference in time between the reference clock and the delayed clock.

Abstract: A delay locked loop (DLL) is described comprising: a delay unit configured to delay an input clock signal by a specified amount to produce a delayed clock signal, said specified amount controlled by a control voltage applied to said delay unit; and a switch configured to clamp said control voltage to a predetermined value when said DLL is reset.

Abstract: An apparatus having a white noise source which is coupled to a gain stage having an amplifier. The gain stage is coupled to a noise shaping stage which is also coupled to a decision circuit. Another apparatus having a white noise source which is differentially coupled to a gain stage that has a cascade of open loop amplifiers. The gain stage is differentially coupled to a noise shaping stage which is also differentially coupled to a decision circuit. A method that involves differentially coupling white noise into a gain stage. The white noise is differentially amplified with an amplifier which produces a first white noise signal. 1/f noise and offset voltage is substantially removed from said first white noise signal to produce a second white noise signal. A random sequence signal is produced by deciding whether the second white noise signal is a 1 or 0.