Abstract: A patient support apparatus tracking system includes at least one of a frame, mattress, and mattress cover. A radio-frequency identification (RFID) tag may be embedded within the at least one of the frame, mattress, and mattress cover. The RFID tag may include an identification memory unit including read-only sort-prefix data corresponding to the one of the frame, mattress, and mattress cover and a service memory unit comprising a read/write configuration including a greater amount of digital storage than the identification memory unit. The RFID tag may be configured to receive a log of configurable equipment updates into the service memory unit and communicate the sort-prefix from the identification memory unit and the log of equipment updates to a controller via a reader device.

Abstract: A patient support apparatus tracking system includes at least one of a frame, mattress, and mattress cover. A radio-frequency identification (RFID) tag may be embedded within the at least one of the frame, mattress, and mattress cover. The RFID tag may include an identification memory unit including read-only sort-prefix data corresponding to the one of the frame, mattress, and mattress cover and a service memory unit comprising a read/write configuration including a greater amount of digital storage than the identification memory unit. The RFID tag may be configured to receive a log of configurable equipment updates into the service memory unit and communicate the sort-prefix from the identification memory unit and the log of equipment updates to a controller via a reader device.

Abstract: A phase conjugate circuit is disclosed for deriving phase conjugation information from a main input signal of a given frequency comprising: an input receiving a reference input signal; at least one phase locked loop circuit comprising an oscillator having a main output signal, an input receiving a PLL input signal, an input receiving a feedback signal from the oscillator and at least one phase detecting means, wherein the phase detection means detects any phase difference between the PLL input is signal and the feedback signal and provides a phase control signal to the oscillator. Ion one embodiment, the main input signal is mixed with the main out put signal to provide the feedback signal and the reference signal is the PLL input signal. In an alternative embodiment, the reference signal is mixed with the main output signal to produce the feedback signal and the main input signal is the PLL input signal.