Broadcom Corporation

Broadcom Corpotation

Anil Tammineedi

Agnes Woo

Ichiro Fujimori

David K Chin

John Perzow

Pieter Vorenkamp

Minsheng Wang

David Chin

Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. The PSE controller may detect and validate a compatible PD, determine a power classification signature for the validated PD, supply power to the PD, monitor the power, and reduce or remove the power from the PD when the power is no longer requested or required. If the PSE finds the PD to be non-compatible, the PSE can prevent the application of power to that PD device, protecting the PD from possible damage.

Apparatus and method for multipoint detection in power-over-ethernet detection mode

An apparatus and method for multi-point detection in a power source equipment (PSE) device is provided. During multi-point detection, a series of at least four currents is sequentially applied to a link port of the PSE device. Each current is applied during a different measurement interval. A voltage measurement sample is obtained for each of the measurement intervals. A difference in voltage between alternating voltage samples is determined and used by a detection module to determine whether a valid power device is coupled to the link port of the PSE.

Apparatus and method for multi-point detection in power-over-Ethernet detection mode

Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power (for example, 48 volts DC) to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE typically includes a controller that controls the DC power provided to the PD at the second node of the communications link. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. In addition, the PSE controller may detect and validate a compatible PD, determine a power classification signature for the validated PD, supply power to the PD, monitor the power, and reduce or remove the power from the PD when the power is no longer requested or required. During detection, if the PSE finds the PD to be non-compatible, the PSE can prevent the application of power to that PD device, protecting the PD from possible damage.

Power over ethernet controller integrated circuit architecture

Apparatus and method for classifying a powered device (PD) in a power source equipment (PSE) controller

Power over Ethernet (PoE) communication systems provide power and data communications over the same communications link, where a power source device (PSE) provides DC power (for example, 48 volts DC) to a powered device (PD). The DC power is transmitted simultaneously over the same communications medium with the high speed data from one node to the other node. The PSE typically includes a controller that controls the DC power provided to the PD at the second node of the communications link. The PSE controller measures the voltage, current, and temperature of the outgoing and incoming DC supply lines to characterize the power requirements of the PD. In addition, the PSE controller may detect and validate a compatible PD, determine a power classification signature for the validated PD, supply power to the PD, monitor the power, and reduce or remove the power from the PD when the power is no longer requested or required. The PSE controller also monitors for a Maintain Power Signature (MPS). The PSE controller removes power from the PD if the MPS condition is absent for longer than its related time limit. The MPS consists of two components: an AC MPS component and a DC MPS component. The PSE controller may optionally monitor the AC MPS component only, the DC MPS component only or both the AC and the DC MPS components.

Apparatus and method for monitoring for a maintain power signature (MPS) of a powered device (PD) in a power source equipment (PSE) controller

Apparatus and method for multi-point detection in power-over ethernet detection mode

A data shuffler apparatus for shuffling input bits includes a plurality of bit shufflers each inputting corresponding two bits xand xof the input bits and outputting a vector {x', x&#x2032;} such that a number of 1's at bit x&#x2032; over time is within &#x2200;1 of a number of 1's at bit x&#x2032;. At least two 4-bit vector shufflers input the vectors {x&#x2032;, x&#x2032;}, and output 4-bit vectors, each 4-bit vector corresponding to a combination of corresponding two vectors {x&#x2032;, x&#x2032;} produced by the bit shufflers, such that the 4-bit vector shufflers operate on the vectors {x&#x2032;, x&#x2032;} in the same manner as the bit shufflers operate on the bits xand x. The current state of the bit shufflers is updated based on a next state of the 4-bit vector shufflers.

Hardware-efficient implementation of dynamic element matching in sigma-delta DAC's

A system and method for noise cancellation in a signal-processing circuit (e.g., an analog-to-digital converter circuit). Various aspects of the present invention may comprise inputting a first input signal and a digital input signal to the signal-processing circuit. The digital input signal may, for example, comprise a digital dither signal or other processor control signal. The signal-processing circuit may, for example, output a signal comprising a first signal component that is primarily a function of the first input signal and a second signal component that is primarily a function of the digital input signal. The second signal component may be estimated based on estimated behavior of the signal-processing circuit in response to the digital input signal. The estimated second signal component may, for example, be substantially removed from the signal-processing circuit output signal.

System and method for noise cancellation in a signal processing circuit

A data shuffler apparatus for shuffling input bits includes a plurality of bit shufflers each inputting corresponding two bits x and x of the input bits and outputting a vector &lcub;x &prime;, x &prime;&rcub; such that a number of 1's at bit x &prime; over time is within &plusmn;1 of a number of 1's at bit x &prime;. At least two 4-bit vector shufflers input the vectors &lcub;x &prime;, x &prime;&rcub;, and output 4-bit vectors, each 4-bit vector corresponding to a combination of corresponding two vectors &lcub;x &prime;, x &prime;&rcub; produced by the bit shufflers, such that the 4-bit vector shufflers operate on the vectors &lcub;x &prime;, x &prime;&rcub; in the same manner as the bit shufflers operate on the bits x and x . The current state of the bit shufflers is updated based on a next state of the 4-bit vector shufflers.

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Los Angeles, CA, United States of America

Anil Tammineedi