| Patent Number |
Title Of Patent |
Date Issued |
| RE40904 |
Apparatus for generating target addresses within a circular buffer including a register for stor |
September 1, 2009 |
| The invention comprises a hardware constructed address generator for a circular buffer which can be of any size and be in any position in memory. The address generator calculates both an absolute value and a wrapped value and selects one in accordance with whether the wrapped value f |
| RE39976 |
Multi-phase switching regulator |
January 1, 2008 |
| An N-phase switching voltage regulator includes N current sensing elements which carry respective phase currents. The voltages present at the switch node sides of the sensing elements are summed and presented to an amplifier which also receives the regulator's output voltage, to produce |
| RE38083 |
Rail-to-rail DAC drive circuit |
April 22, 2003 |
| A voltage mode digital-to-analog converter (DAC) with an output buffer operational amplifier is provided with a rail-to-rail output voltage capability by reducing the DAC's output voltage swing to a range that is within the amplifier's permissible input signal range, and connecting the |
| RE37619 |
Skewless differential switch and DAC employing the same |
April 2, 2002 |
| A differential switch accepts a binary control signal and its complement (which may be skewed with respect to the control signal) and latches both signals simultaneously. The latched output signals drive the control terminals of a differential switch pair which connects one of two te |
| RE35951 |
CMOS voltage reference with stacked base-to-emitter voltages |
November 10, 1998 |
| A band-gap voltage reference forming part of a CMOS IC chip. A .DELTA.V.sub.BE voltage is developed by stacked pairs of parasitic bipolar transistors, with the transistors of each pair operated at different current densities. MOS buffer transistors are connected at corresponding ends |
| 7623051 |
Metastability error reduction in signal converter systems |
November 24, 2009 |
| Signal converter systems are provided which reduce degradation of system bit error rate that is caused by metastable conversion errors which generally occur when analog input signals are near reference thresholds V.sub.th of system comparators. When operating correctly, the comparators |
| 7619552 |
Low distortion current switch |
November 17, 2009 |
| A system and method is provided for code independent switching in a digital-to-analog converter (DAC). A synchronous digital circuit is triggered by a synchronizing clocking signal and develops a digital data signal. A circuit arrangement provides the synchronizing clock a constant l |
| 7617064 |
Self-test circuit for high-definition multimedia interface integrated circuits |
November 10, 2009 |
| A high-definition multimedia interface circuit uses a high-definition multimedia interface encoder to produce a plurality of channels of data. An output circuit, connected to the high-definition multimedia interface encoder, produces a plurality of channels of high frequency data from th |
| 7616044 |
Logarithmic temperature compensation for detectors |
November 10, 2009 |
| The intercept of a logarithmic amplifier is temperature stabilized by generating a signal having the form H log H where H is a function of temperature such as T/T.sub.0. The first H factor is cancelled, thereby generating a correction signal having the form Y log H. The cancellation |
| 7613016 |
Power and information signal transfer using micro-transformers |
November 3, 2009 |
| A power converter provides power across an isolation barrier, such as through the use of coils. A coil driver has transistors connected in a positive feedback configuration and is coupled to a supply voltage in a controlled manner by measuring the output power and opening or closing a |
| 7612820 |
Configurable timing generator |
November 3, 2009 |
| In one embodiment, a configurable timing generator outputs at least one timing signal. The configurable timing generator comprises a first timing generator configurable to output the at least one timing signal so that the at least one timing signal is adaptable to a plurality of appl |
| 7612606 |
Low voltage current and voltage generator |
November 3, 2009 |
| A bandgap reference circuit which is operable in low supply conditions is described. Such a circuit includes a second amplifier and a resistor at the output of a bandgap reference cell to create a constant current summing node at which PTAT and CTAT currents are summed. In modifications |
| 7612544 |
Linearized controller for switching power converter |
November 3, 2009 |
| A linearized controller to operate a switching power converter which includes an inductor having its first terminal coupled to a first voltage (V1) and its second terminal switched so that it alternately connects to a second, higher voltage (V2) or to a common terminal. A sawtooth voltag |
| 7612537 |
Galvanically isolated charge balance system |
November 3, 2009 |
| A galvanically isolated charge balance system for a multicell battery includes a balancing circuit associated with each cell; each balancing circuit including a flying capacitor; a variable conductance switch; and a biasing circuit for the variable conductance switch; and a galvanically |
| 7609144 |
High resistivity thin film composition and fabrication method |
October 27, 2009 |
| A thin film composition is made from silicon, an insulator such as alumina or silicon dioxide, and at least one additional material such as chromium, nickel, boron and/or carbon. These materials are combined to provide a thin film having a .rho. of at least 0.02 .OMEGA.-cm (typically |
| 7609112 |
Boosted tail-current circuit |
October 27, 2009 |
| A circuit includes a pair of input transistors configured as a differential pair and having input terminals configured to receive an input voltage. The circuit also includes a first current source connected to and configured to provide a first tail current to the pair of input transi |
| 7608534 |
Interconnection of through-wafer vias using bridge structures |
October 27, 2009 |
| Bridge structures provide a surface on which to form interconnections to components through through-hole vias. The bridge structures at least partially, and preferably fully, span the gap between two wafers, and, more specifically, between a through-hole via in one wafer and a corres |
| 7606092 |
Testing for SRAM memory data retention |
October 20, 2009 |
| A method of testing a memory cell includes generating a logic low signal, generating a logic high signal, reducing the logic high signal to a level corresponding to the logic low signal plus an offset to produce a reduced logic high signal, providing the logic low signal and the reduced |
| 7605741 |
Digitally corrected SAR converter including a correction DAC |
October 20, 2009 |
| An analog to digital converter having improved differential non-linearity is provided. The converter has a memory which is used to look up the actual weight or a weight error corresponding to the bits that have been kept as part of the SAR process to form an output correction value A par |
| 7605578 |
Low noise bandgap voltage reference |
October 20, 2009 |
| A bandgap voltage reference circuit that can be implemented with low noise characteristics is described. To achieve such low noise, a bandgap reference circuit is provided that includes an amplifier coupled at its inputs to first and second transistors respectively, the transistors b |
| 7602169 |
Input cancellation circuit |
October 13, 2009 |
| A system and method are provided for isolating an input without adding significant distortion and without significantly adversely affecting the bandwidth of input circuits. In one embodiment, a single ended signal is substantially cancelled by an arrangement including an input resistance |
| 7598841 |
Film resistor and a method for forming and trimming a film resistor |
October 6, 2009 |
| A thin film resistor (5) of an integrated circuit comprises an elongate resistive film (7) extending between electrical contact pads (10,11). A low impedance element (20) overlays and is electrically coupled to a portion of the resistive film (7) in an intermediate portion (22) thereof |
| 7598799 |
Bandgap voltage reference circuit |
October 6, 2009 |
| A bandgap voltage reference circuit with an inherent curvature correction which comprises an amplifier having an inverting terminal, a non-inverting terminal and an output terminal is described. A first and second bipolar transistor operable at different current densities are provide |
| 7589659 |
Successive approximation analog to digital converter |
September 15, 2009 |
| A successive approximation analog to digital converter comprising a plurality of capacitors which during a successive approximation conversion are selectively connectable to a first reference or a second reference under the command of a controller. During a conversion step where the |
| 7583146 |
Balanced differential cross-coupled transconductance amplifier for a multiplexor |
September 1, 2009 |
| A balanced, differential, cross-coupled amplifier including an input stage for receiving a differential input and including an input transconductance differential pair and a feedback transconductance differential pair; and an output stage responsive to the input stage for providing a |
| 7583135 |
Auto-nulled bandgap reference system and strobed bandgap reference circuit |
September 1, 2009 |
| An auto-nulled bandgap reference system employing a substrate bandgap reference circuit with primary and auxiliary amplifiers and a switching circuit which in a first mode develops a voltage to null the offset and noise errors of the auxiliary amplifier and then in the second mode uses |
| 7583130 |
Input biasing system for bracketing a floating power supply about an input signal |
September 1, 2009 |
| An input biasing system for accommodating a floating power supply to the range of an input signal includes input terminals for receiving a input signal and a biasing circuit including a first impedance connected between one of the input terminals and a floating power supply and a sec |
| 7581161 |
Method and system for widening the synchronization range for a discrete multitone multicarrier s |
August 25, 2009 |
| A system and method of widening the synchronization range for a discrete multitone multicarrier single pilot tone system includes detecting a first phase error in a received pilot tone; detecting a second phase error in a received second two bit constellation data channel; converting |
| 7577414 |
Methods and apparatus for automatic gain control in broadband tuners |
August 18, 2009 |
| In one aspect, an automatic gain control (AGC) for applying a variable gain to a broadband signal is provided. The AGC comprises a variable gain amplifier adapted to receive the broadband signal as an input, the variable gain amplifier configured to apply a variable gain to the broad |
| 7576598 |
Bandgap voltage reference and method for providing same |
August 18, 2009 |
| A bandgap voltage reference circuit is provided that includes a PTAT source whose polarity reverses at a determinable temperature. The PTAT source is combined with a CTAT source in a manner to remove the effects of the slope of the CTAT source such that a voltage reference may be gen |
| 7576584 |
Clock generators for generation of in-phase and quadrature clock signals |
August 18, 2009 |
| Clock generator embodiments are provided to generate half-rate I and Q clock signals. The generators are configured to insure fan-out limitations, to insure correct phasing at startup, to reduce the number of signal inverters in a critical path, and to reduce the total number of inve |
| 7573313 |
Logic level voltage translator |
August 11, 2009 |
| A voltage level translator provides an output signal having an external voltage in response to an input signal having an internal voltage. The voltage level translator includes first and second input signal transistors, first and second output signal transistors, and includes a signa |
| 7570934 |
Automatic gain control circuit |
August 4, 2009 |
| An automatic gain control circuit is disclosed. The automatic gain control circuit receives a radio frequency signal at an input. The input passes the radio frequency signal to a first gain loop having a changeable gain. A low pass filter filters the radio frequency signal. In a second g |
| 7570116 |
Output stage |
August 4, 2009 |
| An output stage, comprising a first transistor operable to pull a voltage at an output node towards a first voltage, and a rechargeable energy store having a potential difference between first and second terminals wherein the rechargeable energy store is arranged to be controllably c |
| 7570114 |
Common mode rejection calibration method for difference amplifiers |
August 4, 2009 |
| A common mode rejection calibration scheme for use with a difference amplifier having an associated signal path. A signal is generated which varies with the common mode voltage of the differential input voltage applied to the amplifier. This signal is scaled and coupled into the sign |
| 7570089 |
Output stage interface circuit for outputting digital data onto a data bus, and a method for ope |
August 4, 2009 |
| An output stage interface circuit for interfacing with a data bus, comprising first and second rails for receiving respectively a high voltage and a low voltage from a power supply; a data output terminal; a first main switch element coupled between said terminal and the first rail a |
| 7568141 |
Method and apparatus for testing embedded cores |
July 28, 2009 |
| The inputs to an embedded core, e.g., the core terminals, may not be directly connected to pins on the SoC. The lack of direct access to an embedded core's terminals may complicate testing of the embedded core. A test wrapper including boundary scan test (BST) cells may be used to test |
| 7567642 |
Phase detector with extended linear operating range |
July 28, 2009 |
| A method and apparatus for extending the linear range of a phase detector. In one embodiment, a limited range phase difference is generated between selected edges of first and second input signals, and an excursion of the limited range phase difference beyond a predetermined threshold is |
| 7567121 |
Current-mode instrumentation amplifier error reduction circuit and method |
July 28, 2009 |
| A current-mode instrumentation amplifier (IA) error reduction circuit and method employs a current-mode IA topology and an auto-zero circuit. The IA receives a differential voltage (VINP-VINN) and produces differential DC currents (I.sub.DC1, I.sub.DC2) in response, which are summed to |
| 7563632 |
Methods for packaging and sealing an integrated circuit die |
July 21, 2009 |
| A die has a part that is sealed with a cap. The seal can be hermetic or non-hermetic. If hermetic, a layer of glass or metal is formed in the surface of the die, and the cap has a layer of glass or metal at a peripheral area so that, when heated, the layers form a hermetic seal. A no |
| 7558080 |
Power converter system |
July 7, 2009 |
| A power converter system including an LC oscillator circuit, an oscillator drive circuit for driving the LC oscillator circuit, a rectifier circuit coupled to the LC oscillator circuit for providing a DC output, and a switching circuit for controlling the duty cycle of the oscillator dri |
| 7557558 |
Integrated circuit current reference |
July 7, 2009 |
| An IC current reference includes a reference voltage V.sub.ref, a current mirror, and a transistor connected between the mirror input and a first I/O pin and which is driven by V.sub.ref. A resistor external to the IC and having a resistance R1 is coupled to the first I/O pin such that i |
| 7555394 |
Measuring circuit and a method for determining a characteristic of the impedance of a complex im |
June 30, 2009 |
| A single chip integrated circuit measuring circuit (1) for determining a characteristic of the impedance of an external complex impedance circuit (2) for facilitating characterization of the impedance of the complex impedance circuit (2) comprises a signal generating circuit (7) for |
| 7554402 |
High CMR amplifier topology |
June 30, 2009 |
| An amplifier topology includes an input stage comprising a differential pair which conducts respective output currents in response to a differential input signal. Bias current sources provide the pair's tail current and respective bias currents for the input stage in response to a dr |
| 7548941 |
Digital filter using memory to emulate variable shift register |
June 16, 2009 |
| A digital filter uses memory to emulate a variable shift register. Data samples are stored in a memory. The data samples are read from the memory, multiplied with corresponding coefficients stored in the same or a different memory, logically shifted, and written back into the memory |
| 7548440 |
Power and information signal transfer using micro-transformers |
June 16, 2009 |
| A power converter provides power across an isolation barrier, such as through the use of coils. A coil driver has transistors connected in a positive feedback configuration and is coupled to a supply voltage in a controlled manner by measuring the output power and opening or closing a |
| 7546098 |
Control system with selective open-loop operation |
June 9, 2009 |
| A control system may be selectively operated in open loop mode, for example, during data bursts. In a power control system, the transmitted power may be selectively held at a constant level, for example, at the end of a ramp period. The forward path gain of a control system may be va |
| 7545215 |
Circuit to prevent load-induced DC nonlinearity in an op-amp |
June 9, 2009 |
| A circuit for removing non-linearity produced when an amplifier includes a load that results in non-linear current levels is provided. The circuit includes a first transistor element being coupled to one of the differential inputs associated with the amplifier. A second transistor el |
| 7545059 |
Chip-scale coils and isolators based thereon |
June 9, 2009 |
| Coil structures and isolators using them. A coil(s) is (are) used as a magnetic field-generating element(s) paired with another coil(s) or other magnetic field-receiving element(s). The coil(s) is(are) formed in or on a substrate which does not include some or all of the driver (i.e., |
| 7543473 |
Sensor self-test transfer standard |
June 9, 2009 |
| A system, computer program product and method of obtaining a performance parameter associated with a sensor, such as an accelerometer, is provided. The method includes applying an acceleration to the accelerometer and a first frequency to obtain a sensitivity of the accelerometer at |
