Abstract: An apparatus and system are provided for crest factor reduction (CFR). Preferably, a peak from the wideband signal is detected. A gain from the magnitude of the peak and a threshold can then be calculated. Based on this information, each carrier's contribution to the peak can be approximated, and a cancellation pulse coefficient for each carrier from its contribution to the peak can be calculated. A base cancellation pulse can be calculated from the cancellation pulse coefficients for each carrier, and a cancellation pulse can be calculated from the base cancellation pulse and the gain, which can then be applied to the wideband signal.

Abstract: An apparatus and method are provided. Generally, an input signal is applied across a main path (through an input network) and across a cancellation path (through a cancellation circuit). The cancellation circuit subtracts a cancellation current from the main path as part of the control mechanism, where the magnitude of the cancellation current is based on a gain control signal (that has been linearized to follow a control voltage).

Abstract: As part of the protocol for Common Public Radio Interface/Open Base Station Architecture Initiative (CPRI/OBSAI) systems, timing circuits are used to calculate the “round trip” latency across CPRI/OBSAI links. Traditionally, these timing circuits have been plagued with numerous problems. Here, however, a timing circuit is provided that has improved latency measurement accuracy, reduced power consumption, and a reduced likelihood of detecting a false comma. This is generally accomplished through the use of double edge latching in combination with post processing circuit and single bit transmission between low and high speed clock domains.

Abstract: A circuit for generating a band gap reference voltage (VREF) includes circuitry (I3×7) for supplying a first current to a first conductor (NODE1) and a second current to a second conductor (NODE2). The first conductor is successively coupled to a plurality of diodes (Q0×16), respectively, in response to a digital signal (CTL-VBE) to cause the first current to successively flow into selected diodes. The second conductor is coupled to collectors of the diodes which are not presently coupled to the first conductor. The diodes are successively coupled to the first conductor so that the first current causes the diodes, respectively, to produce relatively large VBE voltages on the first conductor and the second current causes sets of the diodes not coupled to the first conductor to produce relatively small VBE voltages on the second conductor. The relatively large and small VBE voltages provide differential band gap charges (QCA-QCB) which are averaged to provide a stable band gap reference voltage (VREF).

Abstract: Quadrature clocking schemes are widely used in modern communications systems, but often suffer from phase imbalance. Conventional solutions that attempt to address this phase imbalance, however, are generally large and use a substantial amount of power. Here, however, a correction circuit is provided that can locally correct for phase imbalance without the need for bulky and high power consuming circuitry.

Abstract: One-time programmable (OTP) Electronically Programmable Read-Only Memories (EPROMs) have been used in a number of applications for many years. One drawback with these OTP EPROMs is that these nonvolatile memories tend to be slow and/or may use a considerable amount of area. Here, however, a bit cell is provided that employs a compact dual cell, which generally includes two OTP cells. These OTP cells are generally arranged in differential configuration to increase speed and are arranged to have a small impact on area.

Abstract: A circuit (1-2) for compensating for variations in the current gain ? of a sensing transistor (Q1) having a collector coupled to a reference voltage (GND) includes a first current mirror (20) having an input coupled to a base of the sensing transistor. A second current mirror (21) has an input coupled to an output of the first current mirror. A current source (13) is coupled to provide emitter current for the sensing transistor. An output of the second current mirror circuit (21) feeds base current of the sensing transistor back to its emitter to cause the collector current of the sensing transistor to be precisely equal to the current (I1) provided by the current source.

Abstract: Over the years, parallel processing has become increasingly common. Conventional circuit simulators have not taken full advantage of these developments, however. Here, a circuit simulator and system are provided that partitions circuit matrices to allow for more efficient parallel processing to take place. By doing this, the overall speed and reliability of the circuit simulator can be increased.

Abstract: A method for providing common-mode feedback is provided. A common-mode current is applied to a common-gate amplifier, and the common-mode current is sensed. In response to the sensed common-mode current, a control voltage is generated. A first feedback current (which is generated in response to the control voltage) can then be applied to differential ground of the common-gate amplifier if the common-mode current is less than a predetermined threshold. Additionally, a second feedback current (which is generated in response to the control voltage) can be applied to input terminals of the common-gate amplifier if the common-mode current is greater than the predetermined threshold.

Abstract: In conventional analog-to-digital converter (ADC) systems, jitter can be a problem because of delay circuits within the sample signal path. Here, an ADC system is provided with a modified delay locked loop (DLL), namely having a variable delay and a fixed delay. The modification to the delay line of DLL enables the removal of delay circuits from the sample path, improve the overall signal to noise ration (SNR).

Abstract: Conventional transceivers do provide some compensation for in-phase/quadrature (I/Q) imbalance. However, these techniques do not separately compensate for I/Q imbalance for the transmitter and receiver sides of the transceiver. Here, a transceiver is provided that allows for compensation of I/Q imbalance in the transmitter and receiver irrespective of the other to allow for a more accurate transceiver.

Abstract: Various apparatuses, methods and systems for detecting simultaneous touches at multiple locates are disclosed herein. For example, some embodiments provide an apparatus for detecting a touch, the apparatus including a resistive touch screen and a controller connected to the touch screen. The touch screen includes a number of electrically conductive columns and rows. In various embodiments, the touch screen is an analog matrix, with the overlapping columns and rows forming a matrix of cubics that can each detect one touch at a time, and with the location of the touch detectable in an analog fashion within each cubic. The resolution of the analog matrix in these embodiments is thus higher than that of the columns and rows. The controller includes an analog to digital converter switchably and sequentially connected to each of the columns and rows. The controller also includes a voltage source switchably and sequentially connected to each of the columns and rows.

Abstract: Generally, displays, like liquid crystal displays (LCDs), use a DC-free addressing voltage in order to prevent decomposition of the display. Here, an integrated circuit (IC) is provided that compensates for temperature dependencies. This IC typically uses a thermistor or temperature varying element to measure the temperature of the display and adjusts the common reference voltage in response to the measured temperature.

Abstract: An infrared (IR) radiation sensor device (27) includes an integrated circuit radiation sensor chip (1A) including first (7) and second (8) temperature-sensitive elements connected within a dielectric stack (3) of the chip, the first temperature-sensitive element (7) being more thermally insulated from a substrate (2) than the second temperature-sensitive element (8). Bonding pads (28A) on the chip (1) are coupled to the first and second temperature-sensitive elements. Bump conductors (28) are bonded to the bonding pads (28A), respectively, for physically and electrically connecting the radiation sensor chip (1) to corresponding mounting conductors (23A). A diffractive optical element (21,22,23,31,32 or 34) is integrated with a back surface (25) of the radiation sensor chip (1) to direct IR radiation toward the first temperature-sensitive element (7).

Abstract: A video display system, such as useful in video surveillance applications, is disclosed. The system includes a video decoder (20) having a common output data port (27) at which it presents interleaved data streams (DSA, DSB). The interleaved data streams (DSA, DSB) may correspond to multiple scalings of a processed video input signal, for example as received from a surveillance camera (C1, C2, C3, C4). The video decoder (20) also outputs multiple clock signals (CLKA, CLKB), each of which are synchronous with a corresponding one of the interleaved data streams (DSA, DSB). This enables a common data port (27) to output multiple data streams (DSA, DSB), while individual destinations (30A, 30B) of the data streams (DSA, DSB) can continue to operate at legacy clock rates.

Abstract: A track-and-hold circuit is provided. This track-and-hold circuit is adapted to track an analog input signal and hold a sampled voltage of the analog input signal at a sampling instant for processing by other circuitry, in response to a track signal that alternates with a hold signal. Preferably, the track-and-hold circuit includes a bi-directional current source that sources and sinks current through a first output node and a second output node, a unity gain amplifier that is coupled to first and second output nodes of the bi-directional current source and that receives the analog input signal, a resistor coupled to an output of the unity gain amplifier, and a capacitor coupled between the resistor and ground. Of interest, however, is the bi-directional current source, which includes a differential input circuit that is adapted to receive the track signal and the hold signal and that is coupled to the first and second output nodes and an RC network that is coupled to the differential input circuit.

Abstract: A method for deskewing a differential signal is provided. A common-mode voltage of a differential signal and an average for the common-mode voltage of the differential signal are measured. A difference between first and second portions of the differential signal is determined, and deskew information is derived from the common-mode voltage and the average. The deskew information can then be combined with the difference to deskew the differential signal.

Abstract: Active resistive circuitry (10, 10A, 11, 11A 25, 30, 35, or 40) includes a first current divider circuit (11) having an input (15) coupled to a first signal (Vi). The first current divider circuit (11) includes a first amplifier (13) having a first input (?) coupled to the first signal (Vi). A symmetrically bilateral first bidirectional circuit (M1a,M1b; R1) is coupled between the first input (?) of the first amplifier (13) and an output (17) of the first amplifier (13), and functions as a feedback circuit of the first amplifier (13). A symmetrically bilateral second bidirectional circuit (M2a,M2b; R2) is coupled between the output (17) of the first amplifier (13) and an output (18) of the first current divider circuit (11).

Abstract: An apparatus is provided. In the apparatus, an input to index (I2I) module maps a complex input into a real signal. A real data tap delay line is coupled to the I2I module and includes N delay-elements. A complex data tap delay line is configured to receive the complex input and includes M delay elements. A set of K of non-linear function modules is also provided. Each non-linear function module from the set has at least one real input, at least one complex input, and at least one complex output. A configurable connectivity crossbar multiplexer couples K of the N real tap delay line elements to real inputs of the set non-linear functions and couples K of the M complex tap delay line elements to complex inputs of the set non-linear function modules.

Abstract: Conventional “on-chip” or monolithically integrated thermocouples are very mechanically sensitive and are expensive to manufacture. Here, however, thermocouples are provided that employ different thicknesses of thermal insulators to help create thermal differentials within an integrated circuit. By using these thermal insulators, standard manufacturing processes can be used to lower cost, and the mechanical sensitivity of the thermocouple is greatly decreased. Additionally, other features (which can be included through the use of standard manufacturing processes) to help trap and dissipate heat appropriately.