Abstract: Systems and methods for Phase-Locked Loop (PLL) based frequency synthesizer comprising a dynamic fraction divider in a feedback loop. The dynamic fraction divider employs a dynamic divide ratio that dynamically changes with the jitters and noise spurs contained in an input signal to the PLL, and generates a feedback signal used to adjust the PLL output frequency. The dynamic divide ratio may be determined by comparing the phases of the PLL output signal and the input signal.

Abstract: A system and method are provided for automatic frequency acquisition maintenance in a clock and data recovery (CDR) device. In an automatic frequency acquisition (AFA) mode, the method uses a phase detector (PHD) to acquire the phase of a non-synchronous input communication signal having an initial first frequency. In the event of a loss of lock/loss of signal (LOL/LOS) signal being asserted, a frequency ratio value is retrieved from memory. Using a phase-frequency detector (PFD), the reference signal, and the frequency ratio value, a synthesized signal is generated. In response to using the PFD to generate the synthesized signal and the LOL/LOS signal being deasserted, a rotational frequency detector (RFD) is used to generate a synthesized signal having a frequency equal to the frequency of the input communication signal. With the continued deassertion of the LOL/LOS signal, the PHD is enabled and the phase of the input signal is acquired.

Abstract: A system and method are provided for automatic frequency acquisition maintenance in a clock and data recovery (CDR) device. In an automatic frequency acquisition (AFA) mode, the method uses a phase detector (PHD) to acquire the phase of a non-synchronous input communication signal having an initial first frequency. In the event of a loss of lock/loss of signal (LOL/LOS) signal being asserted, a frequency ratio value is retrieved from memory. Using a phase-frequency detector (PFD), the reference signal, and the frequency ratio value, a synthesized signal is generated. In response to using the PFD to generate the synthesized signal and the LOL/LOS signal being deasserted, a rotational frequency detector (RFD) is used to generate a synthesized signal having a frequency equal to the frequency of the input communication signal. With the continued deassertion of the LOL/LOS signal, the PHD is enabled and the phase of the input signal is acquired.

Abstract: A power transmission safety system is disclosed having a pair of power transmission members, each of the power transmission members having a switch arm. Each of a pair of switch arm engaging members reversibly engage a switch arm of its respective power transmission member. Each of a pair of pivoting shaft members are coupled to a respective one of the pair of switch arm engaging members on one end, and a rotatable handle on an opposing end. An interlocking power activation bar has a pair of openings located thereon, whereby rotation of one of the pivoting shaft members engages a switch arm of a respective circuit breaker into an “on” position and displaces the interlocking power activation bar to lock the other of the shafts from rotating, thereby preventing both of said power transmission members from being “on” concurrently.