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"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 7436203 | On-chip transformer arrangement An integrated circuit requires on-chip termination resistor for minimizing reflections from input signals supplied by an external signal source. The input signal is applied across two bonding pads which serve as input terminals for the integrated circuit. The first ... | 10/14/2008 |
| 7433714 | Alert mechanism interface An apparatus, system, and method are generally related to an alert mechanism. The alert mechanism is activated by the detection of one or more triggers, where the triggers can be categorized as time based and event based. Time-based triggers include timer based func... | 10/07/2008 |
| 7403754 | Tower discovery and failover Described is a communication system including wireless client devices. In the described system, the client devices may be wrist-worn watches such as are in common use today, except that the watches are specially configured to receive transmissions from broadcast tow... | 07/22/2008 |
| 7403052 | Power-on detect by measuring thermal voltage A power-on detection circuit is arranged to cooperate with a thermal-voltage generator to determine when predictable circuit operation is achieved. The power-on detection circuit includes a comparator circuit and an inverter circuit. A power-on reset (POR) signal is... | 07/22/2008 |
| 7388432 | Current feedback amplifier with extended common mode input range A Current Feedback Amplifier (CFA) is arranged to receive an input signal having a common mode (CM) range that is greater than the voltage across the supply rails. The CFA contains a rail-to-rail output stage that is configured to output an output signal in response... | 06/17/2008 |
| 7388423 | Start-up circuit with folding current arrangement A start-up circuit includes a long channel current generator, a subtracting reference current generator, and a gain scaling current mirror-circuit. The long channel current generator circuit uses a long channel transistor circuit that simulates a high value resistor... | 06/17/2008 |
| 7352704 | Method and apparatus for multi-path delay spread detection in wideband CDMA systems A fast, low-complexity detection scheme for determining the delays and gains of different propagation paths (i.e., multi-paths) of a received WCDMA signal. The method utilizes a continuous pilot channel that is scrambled by an known pseudo-random sequence. The recei... | 04/01/2008 |
| 7352242 | Programmable gain trim circuit A programmable gain amplifier includes a first gain setting circuit and a second gain setting circuit that are both coupled to an output of an amplifier. A trim adjustment circuit is and arranged to complete feedback to the amplifier by digitally panning between the... | 04/01/2008 |
| 7339755 | Ring device with optical focusing mechanism A ring device is adapted for wearing on at least one finger of a user. The ring device includes a wearable main body portion and an optical member that is moveably affixed thereto. The optical member can be positioned in at least two positions: a viewing position, a... | 03/04/2008 |
| 7332904 | On-chip resistor calibration apparatus and method An on-chip resistor is calibrated with a sense circuit that compares a resistance associated with an off-chip resistor to the on-chip resistor via a current-mirror circuit and a comparator. A digital counter circuit evaluates the comparison and adjusts its count suc... | 02/19/2008 |
| 7324617 | Apparatus and method for detecting downlink transmit diversity at a mobile device A mobile device detects downlink transmit diversity. Slot and frame timing knowledge and a downlink scrambling code are applied to pilot and synch channels of the signal. An algorithm suited for the diversity case and an algorithm suited for the non-diversity case a... | 01/29/2008 |
| 7315204 | Class AB-D audio power amplifier Audio power amplifier circuits that are arranged to operate in either a class AB or a class D operating mode. A drive circuit is configured to share control between a class AB driver and a class D modulator/driver circuit. The input signal level is monitored to dete... | 01/01/2008 |
| 7307481 | Minimum synchronization frequency discriminator A minimum frequency synchronization discriminator for use in providing a clock signal for a switch mode power supply automatically detects when the frequency of a sync signal is above a minimum frequency and causes the sync signal to serve as the clock signal for th... | 12/11/2007 |
| 7307558 | Dual shift register data serializer A data serializer includes a data aligner, two N-bit shift registers, a 2-1 multiplexer, and a driver, wherein N is the number of parallel input data bits. Data is received and aligned by the data aligner, which is arranged to drive odd and even data lines to a resp... | 12/11/2007 |
| 7307412 | Inductive measurement system and method A system and method measures parameters associated with an inductor such as in a switching converter. The inductance value can be determined by monitoring voltages and currents associated with the inductor when a measurement mode is activated. In one example, the me... | 12/11/2007 |
| 7286589 | Method and apparatus for generation of downlink scrambling code in wideband CDMA mobile devices An initialization method is performed to initialize the states for producing downlink scrambling code for a wideband code division multiple access (WCDMA) mobile device. The initialization method uses an auxiliary linear feedback shift register (x-LFSR) advance the ... | 10/23/2007 |
| 7286060 | Indicators for vacuum tube replacement devices A vacuum tube replacement device includes an indicator. The indicator can be arranged to provide audible and/or visual indication of system performance, function, status, or any other desired indication. The vacuum tube replacement device is pin-for-pin compatible w... | 10/23/2007 |
| 7285992 | Amplifier with charge-pump generated local supplies An amplifier system includes a follower-type output stage that is driven by a pre-driver circuit. The follower-type output stage that is operated from VCC and GND (or VEE) power supplies. The pre-driver circuit for the follower output stage is operated from local po... | 10/23/2007 |
| 7279960 | Reference voltage generation using compensation current method A reference voltage generator that may be useful in analog-to-digital converter (ADC) circuits includes compensation for errors such as from non-ideal considerations such as semiconductor processing variations, mismatch errors, temperature gradients, and parasitic e... | 10/09/2007 |
| 7276962 | Circuit topology for reduced harmonic distortion in a switched-capacitor programmable gain amplifier A switched-capacitor programmable gain amplifier (PGA) has improved circuit performance that avoids impracticably small capacitors, while providing low total harmonic distortion (THD) and reasonable gain linearity. The sampling capacitor (CS) in the PGA is designed ... | 10/02/2007 |
| 7272376 | Look-up table implementation of WCDMA frame synchronization and cell group ID detection The present invention is directed towards a look-up table implementation of a WCDMA frame synchronization and a cell group ID detection (both of which are comprised within a “secondary search” process). The secondary search process receives a signal (which is fo... | 09/18/2007 |
| 7268526 | Switch mode power supply control circuit An apparatus and method is arranged to dynamically adjust a pulse width (e.g., off-time pulse) associated with a switching device in a converter such as a buck converter, a boost converter, or a buck-boost regulator. A one-shot circuit is configured to dynamically i... | 09/11/2007 |
| 7265530 | Adaptive slope compensation for switching regulators A system, method, and apparatus are arranged to provide adaptive slope compensation in a switching regulator that includes an inductor. A control loop of the switching regulator is responsive to a ramp signal. A ramp generator that includes a capacitor circuit and a... | 09/04/2007 |
| 7260732 | Power regulation system and method for a portable electronic device A power regulating system and method are provided for regulating power in a portable computing device. The portable computing device includes microprocessing and radio communication capabilities. The power regulating system utilizes a number of power states to regul... | 08/21/2007 |
| 7257743 | Method and system for reporting failures of a program module in a corporate environment A computer-implemented method and system for reporting failures in an application program module to a corporate file server. The failure may be a crash or a set-up failure. Once detected, the program failures are categorized, i.e. bucketed, and reported directly to ... | 08/14/2007 |
| 7248098 | Curvature corrected bandgap circuit An apparatus and method provide for curvature corrected temperature variations in a band-gap reference circuit. The apparatus includes a band-gap cell, an IPTAT circuit, a resistor, and a feedback circuit. The band-gap cell is arranged to provide a band-gap voltage.... | 07/24/2007 |
| 7187318 | Pipeline ADC using multiplying DAC and analog delay circuits Each stage of a pipeline ADC includes an analog delay cell, a sub-stage ADC, and a multiplying digital-to-analog converter (MDAC). The MDAC includes a sample-and-hold amplifier (SHA) circuit, a summer, a gain stage, and a DAC. The MDAC is arranged in cooperation wit... | 03/06/2007 |
| 7181701 | Glanceable information system and method An apparatus, system, and method are related to navigating through content on a device that includes stored information that is organized according to channels. Content that is associated with the channels is selected and viewed on a display of the device by means o... | 02/20/2007 |
| 7167569 | Output coupling capacitor free audio power amplifier dynamically configured for speakers and headphones with excellent click and pop performance First and second channel bridge amplifiers are dynamically configured to drive either speakers or headphones. The first channel bridge amplifier includes a first amplifier driving one end of a first speaker through a mechanical switch in a headphone-jack, and a seco... | 01/23/2007 |
| 7142042 | Nulled error amplifier A multi-stage amplifier circuit that is arranged to minimize offset related errors in a reference circuit. The first stage circuit includes an array of amplifier circuits that receive feedback signals. The outputs of the first stage amplifier circuits are coupled to... | 11/28/2006 |
| 7136000 | Selective offset adjustment of a track and hold circuit A track/hold circuit with an offset adjustment that can be used to compensate for offset errors from other parts of the system containing the track/hold circuit. The offset adjustment may be provided by impressing a voltage at an electrode of a capacitor of the trac... | 11/14/2006 |
| 7135894 | Dual-output current driver A dual-output current driver includes a pair of output stages that provide output current to various devices such as LEDs and laser diodes. An output-stage selector circuit that includes a differential pair is arranged to activate one of the output stages at a time.... | 11/14/2006 |
| 7133483 | Apparatus and method for a jitter cancellation circuit The invention produces an output signal that maintains a substantially constant period corresponding to a clock signal. An input signal includes a period that is an integer multiple of the period of the clock signal. The timing or phase of the input signal may shift... | 11/07/2006 |
| 7106038 | Increased output range and decreased gain variation PWM circuit and method A pulse-width modulator (PWM) accommodates a wider range of output pulse widths, with less gain variation, when compared to conventional circuits. The PWM can operate without requiring a voltage reference. In one example PWM, a ramp generator in the PWM includes a c... | 09/12/2006 |
| 7102415 | Trip-point detection circuit A current is provided from a power source to a load through a pass circuit that is series coupled to a sense resistor. A current trip-point detection circuit is arranged to detect a change in the current that is provided to a load. The current trip-point detection c... | 09/05/2006 |
| 7071630 | Closed loop magnetic boost LED driver system and method Current is delivered to a load using a closed-loop boost circuit topology that is suitable for LED driver applications. An inductor is charged when a transistor is active during a first operating phase. The inductor delivers current to the load when the transistor i... | 07/04/2006 |
| 7068194 | High-density MOS-decoded unary DAC Multiple switching circuits and current source circuits are arranged to operate as part of a compact unary DAC cell. The compact unary DAC cell can be combined with additional compact unary DAC cells to provide a scalable unary DAC system that may be segmented, non-... | 06/27/2006 |
| 7068195 | Accurate sampling technique for ADC A time interleaved ADC system includes a delay circuit that has a dynamically adjusted speed to achieve uniformly spaced sampling intervals. The adjustment control circuit monitors the sampling pulses associated with sampling time instant for each ADC, and provides ... | 06/27/2006 |
| 7061210 | Controllable current trip-point detection circuit A current trip point detection circuit includes a transistor, a series of resistors, an amplifier, a comparator, and a series of switching circuits. The first transistor and the resistors are configured as an inverting gain stage. The amplifier cooperates with the f... | 06/13/2006 |
| 7051126 | Hardware accelerated compression A compression system is arranged to use software and/or hardware accelerated compression techniques to increase compression speeds and enhance overall data throughput. A logic circuit is arranged to: receive a data stream from a flow control processor, buffer the da... | 05/23/2006 |
