Abstract: Aspects of a method and system for enhancement of power amplifier (PA) efficiency through controlled variation of gain in a power amplifier driver are presented. Aspects of the system may comprise an envelope detector that enables detection of an amplitude of an analog input signal. The envelope detector may enable computation of a first gain value based on the detection. A second gain value may be computed based on the first gain value. A PA may enable generation of an analog output signal based on the analog input signal, the first gain value and the second gain value.
Abstract: A method and apparatus for controlling data flow across a network performs a method which includes transmitting a packet request message from a first station to a second station, then determining if the packet request message is valid. A request acknowledge message is transmitted from the second station to the first station, and it is then determined if the request acknowledge message is valid. The packet request message and the request acknowledge message each includes a control bit string, an identification bit string, and at least one parity bit.
Abstract: A method for calibrating a phase locked loop begins by determining a gain offset of a voltage controlled oscillator of the phase locked loop. The processing then continues by adjusting current of a charge pump of the phase locked loop based on the gain offset.
Abstract: A K-bit information signal represented by a polynomial U(x) having a degree K?1 is received. The information signal is transformed to form a transformed information signal using a first transform represented by a polynomial G1(x) having a degree P. The transformed information signal is represented by a polynomial T(x) having a degree K+P?1. T(x) equals U(x)G1(x). An initial cyclic code represented by a polynomial R1(x) is generated for the transformed information signal using a second transform represented by a polynomial G2(x), where G2(x) has high-order leading-zero terms. R1(x) equals the remainder obtained by dividing T(x) by G2(x). The initial cyclic code is transformed to form a final cyclic code represented by a polynomial R2(x) using the first transform. R2(x) equals R1(x)/G1(x).
Abstract: A signal weighting and combining method implemented within a receiver having a plurality of receive antennas is disclosed herein. Each receive antenna is disposed to produce a received RF signal in response to a transmitted RF signal received through a channel. The method includes weighting the plurality of received RF signals produced by the antennas in accordance with a corresponding plurality of RF weighting values selected to maximize an output signal-to-noise ratio of the receiver averaged over the channel, thereby forming a plurality of weighted RF signals. The method further includes combining ones of the plurality of weighted RF signals in order to form one or more combined RF signals. A similar splitting and weighting method capable of being implemented within a transmitter having a plurality of transmit antennas is also disclosed.
Type:
Grant
Filed:
April 29, 2004
Date of Patent:
May 26, 2009
Assignee:
Broadcom Corporation
Inventors:
Severine Catreux, Vinko Erceg, Pieter Roux, Pieter Van Rooyen, Jack Winters
Abstract: A media event timer includes a counter module for generating a sequence of counts based on a clock signal of a disk drive unit. A counter reset module sets the counter module to a reset count in response to a servo address mark detection signal. A detector module detects that a servo address mark has been missed and sets the counter module to a restart count when the servo address mark has been missed. A trigger module triggers a first media event when a first media event count compares favorably to a count of the sequence of counts.
Abstract: A Radio Frequency (RF) structure services an antenna having a characteristic impedance and includes a differential Power Amplifier (PA), a differential Low Noise Amplifier (LNA), and a balun transformer. The differential PA has a differential PA output with a PA differential output impedance. The differential LNA has a differential LNA input with an LNA differential input impedance. The balun transformer has a singled ended winding coupled to the antenna, a differential winding having a first pair of tap connections coupled to the differential PA output and a second pair of tap connections coupled to the differential LNA input, and a turns ratio of the single ended winding and the differential winding. The turns ratio and the first pair of tap connections impedance match the PA differential output impedance to the characteristic impedance of the antenna. The turns ratio and the second pair of tap connections impedance match the LNA differential input impedance to the characteristic impedance of the antenna.
Type:
Grant
Filed:
January 2, 2008
Date of Patent:
May 26, 2009
Assignee:
Broadcom Corporation
Inventors:
Jesus Alfonso Castaneda, Ahmadreza (Reza) Rofougaran, Keith A. Carter
Abstract: Modular, portable data collection terminals are disclosed for use in mixed wireless and hard-wired RF communication networks, wherein various radio transmitter modules and associated antennas may be selectively added to a base terminal unit to solve networking problems associated with specific types of business environments. Modularity exists in both the hardware (splitting data collection and processing control circuitry from radio transceiver control circuitry) and software (splitting transceiver-specific, lower level communication protocol from generic, higher level communication protocol). The control circuitry, including associated microprocessors devices, interact to selectively activate communication circuits to perform necessary communication or data processing functions and enter and remain in a power-saving dormant state during other times. To support such dormant or “sleeping” states, a series of communication protocols provide for channel access to the communication network.
Abstract: A method for receiving a frame in a high data throughput wireless local area network begins by receiving a preamble of the frame via a channel in accordance with a default receiver filter mask. The processing continues by validating the preamble. The processing continues by, when the preamble is validated, interpreting the preamble to determine a high data throughput channel configuration. The processing continues by reconfiguring the default receiver filter mask in accordance with the high data throughput channel configuration to produce a reconfigured receiver filter mask. The processing continues by receiving a data segment of the frame in accordance with the reconfigured receiver filter mask.
Type:
Grant
Filed:
February 13, 2004
Date of Patent:
May 26, 2009
Assignee:
Broadcom Corporation
Inventors:
Tushar Moorti, Christopher J. Hansen, Jason A. Trachewsky
Abstract: A method and apparatus are disclosed for performing adaptive run-time power management in a system employing a CPU and an operating system. A CPU cycle tracker (CCT) module monitors critical CPU signals and generates CPU performance data based on the critical CPU signals. An adaptive CPU throttler (THR) module uses the CPU performance data, along with a CPU percent idle value fed back from the operating system, to generate a CPU throttle control signal during predefined run-time segments of the CPU run time. The CPU throttle control signal links back to the CPU and adaptively adjusts CPU throttling and, therefore, power usage of the CPU during each of the run-time segments.
Abstract: A network component for processing a packet can include a buffer configured to receive a packet in an ingress port at a network component, a first identification unit configured to identify a destination address and a network identifier from the packet received at the buffer, and a look-up table configured to be indexed by the destination address and the network identifier identified by the identification unit to obtain an outgoing port bit map. In addition, the network component can include a forwarding unit configured to forward the packet to a destination module and out of an egress port within the network component based on the outgoing port bit map.
Abstract: A wireless transceiver includes a plurality of antennas. A plurality of signal recovery circuits generate a selected number of received signals from a first subset of the plurality of antennas, based on a control signal. A receiver section recovers an inbound data stream from the selected number of received signals. A transmitter module generates a transmit signal to a selected one of the plurality of antennas, based on the control signal. The intersection between the first subset of the plurality of antennas and the selected one of the plurality of antennas is the null set for each value of the control signal. The control signals can be generated in multiple different operational modes including, for instance, a cyclic modes and a fixed mode of operation.
Abstract: A method and apparatus for decoding and displaying a bitstream, such as, for example, Motorola/GI HITS bitstream, is provided. The method avoids displaying artifacts caused by displaying incompletely decoded pictures after channel acquisition. After the channel acquisition, an entry picture, a P-picture with the refreshed I-slices at the top of the picture, is first displayed with all pixels below the refreshed I-slices zeroed (blacked) out. Then the subsequent P-pictures are displayed with all pixels below their respective refreshed I-slices zeroed out. Once a P-picture has been completely decoded, normal decoding process is started.
Abstract: Systems and methods for increasing audio SNR in a NICAM digital sound decoder are provided. One method according to the invention includes receiving a scale factor that indicates a number of bits of a Near Instantaneous Companded Audio Multiplex (NICAM) signal that have been truncated from the signal. The method also includes receiving the NICAM signal itself. The NICAM signal may include a predetermined number of zero bits in place of the predetermined number of truncated bits. The method may also require appending a bit pattern to the NICAM signal that approximates a rounding of the NICAM signal. The bit pattern preferably includes at least one non-zero bit. Another method according to the invention may include selecting a bit pattern from a collection of bit patterns. The collection of bit patterns may include at least non-zero bit.
Abstract: A charge stored in a battery is estimated by multiplying estimated charge currents supplied during charge phases and estimated discharge currents discharged during operational modes by the respective amounts of time of charging and discharge. The state of charge of the battery is calculated from the estimated stored charge. Furthermore, parameters of the battery may be measured to be used to adjust the estimated state of charge of the battery. In a first case, the estimated stored charge may be adjusted to a charge value corresponding to the detected completion of a constant current charge phase. In a second case, the estimated stored charge may be adjusted to a charge value corresponding to the detected completion of a constant voltage charge phase. In a third case, the estimated stored charge may be adjusted to a charge value corresponding to a detected predetermined discharge level of the battery.
Type:
Application
Filed:
October 31, 2008
Publication date:
May 21, 2009
Applicant:
Broadcom Corporation
Inventors:
Domitille Esnard, John Walley, Sumit Sanyal
Abstract: A highly linearized capacitor structure is formed by a first capacitor, that is coupled between a first terminal and a common node, combine with a second capacitor, that is coupled between a second terminal and the common node. When a bias voltage is applied, the capacitance values of the first and second capacitors combine and a capacitance variation of the first capacitor is compensated by a capacitance variation of the second capacitor to reduce and linearize overall capacitance variation in the combined capacitor structure.
Type:
Application
Filed:
November 19, 2007
Publication date:
May 21, 2009
Applicant:
Broadcom Corporation
Inventors:
Nikolaos C. Haralabidis, Ioannis G. Kokolakis
Abstract: Methods, systems, and apparatuses for determining battery state of health are provided. A battery that is substantially uncharged is charged with a substantially constant charge current. A time duration of the charging of the battery with the substantially constant charge current is determined. A state of health of the battery is estimated based upon the determined time duration and the constant charge current. The state of health of the battery may be calculated by multiplying the determined time duration with a value of the constant charge current to determine a total accumulated charge, and applying a predetermined factor to the accumulated charge to determine the state of health. The predetermined factor is a fixed percentage of the total charge capacity of the battery that corresponds to the battery type.
Abstract: A method and apparatus is disclosed to map a sequence of data to Quadrature Amplitude Modulation (QAM) constellation symbols. The method and apparatus encodes only a portion of the sequence of data and leaves a remaining portion of the sequence of data unencoded. The encoded portion of the sequence of data and the remaining unencoded portion of the sequence of data are then mapped into modulation symbols of the QAM constellation. The encoded portion of the sequence of data selects subsets of the QAM constellation, and the remaining unencoded portion of the sequence of data determines a specific modulation symbol within each subset of the QAM constellation.
Type:
Application
Filed:
November 17, 2008
Publication date:
May 21, 2009
Applicant:
Broadcom Corporation
Inventors:
Lin HE, Thomas J. Kolze, Ba-Zhong Shen, Gottfried Ungerboeck, Bruce J. Currivan
Abstract: An inductor circuit is disclosed. The inductor circuit includes a first in-silicon inductor and a second in-silicon inductor each having multiple turns. A portion of the multiple turns of the second in-silicon inductor is formed between turns of the first in-silicon inductor. The first and second in-silicon inductors are configured such that a differential current flowing through the first in-silicon inductor and the second in-silicon inductor flows in a same direction in corresponding turns of inductors.
Type:
Application
Filed:
January 26, 2009
Publication date:
May 21, 2009
Applicant:
Broadcom Corporation
Inventors:
Carol Barrett, Tom McKay, Subhas Bothra
Abstract: Provided is a method and system for transmitting MPEG frames between a DOCSIS based satellite modem termination system (SMTS) and a corresponding satellite modem (SM) system. The method includes identifying at least one data stream requiring transmission between the SMTS and the SM, the data stream including one or more MPEG frames. Next, the MPEG frames are organized within SMTS data queues based upon predetermined parameters and then transmitted based upon their organization within the data queues.
Type:
Grant
Filed:
April 14, 2004
Date of Patent:
May 19, 2009
Assignee:
Broadcom Corporation
Inventors:
Alan Gin, Dorothy D. Lin, Jen-Chieh Chien, Rocco Brescia, Jr.