| Patent Number |
Title Of Patent |
Date Issued |
| RE39065 |
Switching voltage regulator circuit |
April 18, 2006 |
| An integrated circuit for use in implementing a switching voltage regulator, the integrated circuit including a power switching transistor, driver circuitry and control circuitry, which is operable in a normal feedback mode or an isolated flyback mode. The integrated circuit includes |
| RE35261 |
Differential input amplifier stage with frequency compensation |
June 4, 1996 |
| A differential input amplifier stage having improved frequency compensation. Frequency compensation is achieved by cancelling one-half of the signal output of a differential error amplifier in the input stage, such that all error signals must pass through a "current-mirror" type load |
| RE35221 |
Schottky enhanced CMOS output circuit |
April 30, 1996 |
| The high impedance state of a tri-state CMOS transistor output circuit is enhanced by serially connecting first and second Schottky diodes with the P-channel transistor and the N-channel transistor whereby in the high impedance state reverse bias of the substrate/source-drain diodes of t |
| RE34821 |
High speed junction field effect transistor for use in bipolar integrated circuits |
January 3, 1995 |
| A high speed BIFET junction field effect transistor is formed in an epitaxial layer of one conductivity type and includes source and drain regions of opposite conductivity type interconnected by a thin channel region of the opposite conductivity type. A thin surface layer of the one |
| RE33475 |
Integrated circuit having permanent adjustment circuitry which requires low adjustment current |
December 4, 1990 |
| An integrated circuit resistor adjustment network with resistors (R1, R.sub.2, R.sub.3, R.sub.4) which may be paralleled by trimming resistors (R5, R7, R6, R8, respectively) upon electrical "zapping" of Zener diodes (Z1, Z2, Z3, Z4, respectively) connected in series with the trimming |
| 7443237 |
Folded cascode amplifier having improved slew performance |
October 28, 2008 |
| A folded cascode amplifier having improved slew comprises an input differential transistor pair circuit, a cascode branch circuit coupled to the differential pair circuit, and a boost circuit for increasing branch current when the amplifier is in a slew condition. The additional current |
| 7432695 |
Adaptive power control for hysteretic regulators |
October 7, 2008 |
| A hysteretic regulator may be set to an active mode when voltage at an output falls to a first threshold level. In the active mode, charge is applied to an output node by a current having a set limit value. The regulator is set to an inactive mode when the voltage at the output node |
| 7426374 |
Combination of high-side and low-side current sensing in system for providing power over communi |
September 16, 2008 |
| A system for supplying power to a load over a communication link has high-side current sensing circuitry for measuring a high-side current value, low-side current sensing circuitry for measuring a low-side current value, and control circuitry responsive to both the high-side current |
| 7420359 |
Bandgap curvature correction and post-package trim implemented therewith |
September 2, 2008 |
| A bandgap voltage reference circuit having temperature curvature correction, comprises a bandgap voltage source configured to generate an output voltage, and a novel curvature correction circuit. The correction circuit is responsive to the bandgap voltage source output voltage and co |
| 7417509 |
Spread spectrum modulation of a clock signal for reduction of electromagnetic interference |
August 26, 2008 |
| A spread spectrum frequency modulated oscillator circuit usable as a clock comprises a reference component such as a resistor, a voltage controlled oscillator and a first circuit coupled to the reference component and voltage controlled oscillator and configured to supply a first control |
| 7414561 |
Gradient insensitive split-core digital to analog converter |
August 19, 2008 |
| Digital to analog converter circuits and methods are provided for producing an analog output voltage indicative of a digital input signal with at least partial insensitivity to error gradients. Described are split-core resistive elements, which include a plurality of one-dimensional |
| 7414473 |
Class AB folded-cascode amplifier having cascode compensation |
August 19, 2008 |
| A class AB folded-cascode amplifier having improved gain-bandwidth product, comprises a differential input circuit including a differential transistor pair coupled to a source of tail current and responsive to a differential input signal for conducting a first current, a cascode circ |
| 7414302 |
Flashless lead frame with horizontal singulation |
August 19, 2008 |
| A lead frame is configured for use with a singulation apparatus that eliminates flash. A die pad is attached to sides of the frame by tie bars and peripheral portions. The peripheral portions have cutout sections defining openings that are bridged by lead frame segments. The apparatus |
| 7402480 |
Method of fabricating a semiconductor device with multiple gate oxide thicknesses |
July 22, 2008 |
| The individual performance of various transistors is optimized by tailoring the thickness of the gate oxide layer to a particular operating voltage. Embodiments include forming transistors with different gate oxide thicknesses by initially depositing one or more gate oxide layers wit |
| 7394231 |
Current-mode control for switched step up-step down regulators |
July 1, 2008 |
| A switched regulator circuit provides step-up and step-down operation in which the level of the input voltage can be greater, equal to, or less than a preset controlled output voltage. A four switch arrangement or two switch arrangement provides buck, boost, and buck-boost regulation und |
| 7388444 |
Switching regulator duty cycle control in a fixed frequency operation |
June 17, 2008 |
| A clock oscillator system for use in providing the switching regulator duty cycle control in a fixed frequency (no cycle skipping) operation is provided. In one embodiment, the circuit according to the invention uses an analog feedback loop to extend the switch ON time of the clock cycle |
| 7382303 |
Non-perturbing power supply margin controller |
June 3, 2008 |
| A power supply margin controller may alter the voltage of a control signal used to control the output voltage of a power supply. The controller may include a digital-to-analog converter having an input and an output, and a comparator having a first input coupled to receive the control si |
| 7382167 |
Circuit and method for controlling hysteresis for bilevel signal transitions |
June 3, 2008 |
| An output signal is controlled with adjustable hysteresis in response to a variable voltage input signal. One or more signals derived from the input signal are respectively compared with first and second reference voltages of different magnitudes. The output signal changes from a first s |
| 7378822 |
Switching regulator slope compensation generator circuit |
May 27, 2008 |
| A slope compensation circuit that provides slope compensation in a switching regulator is provided. The slope compensation circuit preferably is adapted to receive an oscillator pulse train from a pulse width modulator oscillator and a modulator pulse train from a pulse width modulat |
| 7375671 |
Systems and methods for reducing transient errors on digital to analog converters (DACs) deglitc |
May 20, 2008 |
| A digital to analog converter that receives a digital signal and that converts the digital signal to an analog input signal is provided. The converter may include a group of most significant bits. The group is decoded to drive a plurality of equivalent most significant segments. The |
| 7374982 |
High voltage MOS transistor with gate extension |
May 20, 2008 |
| A high voltage MOS transistor with a gate extension that has a reduced electric field in the drain region near the gate is provided. The high voltage MOS transistor includes a first and second gate layers, and a dielectric layer between the gate layers. The first and second gate laye |
| 7365600 |
Non-feedback implemented control of the output-common mode of a differential amplifier |
April 29, 2008 |
| A differential amplification circuit includes a differential amplifier and common mode control circuitry configured to control output common mode of the differential amplifier. However, this control circuitry does not use feedback. The circuitry controls the output common mode in either, |
| 7365525 |
Protection for switched step up/step down regulators |
April 29, 2008 |
| A four switch voltage converter is regulated for buck mode and boost mode under constant frequency valley-peak current mode control. Protection circuits are responsive to output voltage and regulator current to prevent excessive current that otherwise might result from abnormally low |
| 7362191 |
Methods and circuits for frequency modulation that reduce the spectral noise of switching regula |
April 22, 2008 |
| The present invention comprises methods and circuits for spread spectrum frequency modulation that reduce peak spectral noise at the outputs or inputs of switching regulators. More specifically, the present invention modulates the operating frequency of the switching regulator in acc |
| 7356588 |
Circuits and methods for detecting the presence of a powered device in a powered network |
April 8, 2008 |
| Circuits and methods for detecting the presence of a powered device in a powered network connection and removing power from the powered network connection when no powered device is present are disclosed. The circuits and methods involve applying a time-varying voltage signal into an anal |
| 7348767 |
Bidirectional power conversion with multiple control loops |
March 25, 2008 |
| Bidirectional power conversion systems provide the ability to change power attributes to and from a component. Current bidirectional power conversion systems use a unidirectional power converter for each direction. The integration of the two normally independent power converters resu |
| 7342431 |
Low power wide dynamic range RMS-to-DC converter |
March 11, 2008 |
| An RMS to DC converter squares an a-c input signal to obtain a squared direct current voltage signal. The squared direct current voltage signal is applied to successive stages, each stage amplifying its received signal and detecting the amplified level of the signal within a confined |
| 7342392 |
Switching regulator with slope compensation independent of changes in switching frequency |
March 11, 2008 |
| Compensation for a switching regulator is attained by developing a compensation signal for a switching regulator that is independent of changes in the switching frequency. The regulator operational frequency is established in accordance with a repetitive ramp signal of constant slope |
| 7342328 |
Methods and circuits for tracking and sequencing multiple power supplies |
March 11, 2008 |
| The present invention relates to methods and circuits for controlling outputs of one or more slave power supplies in one or more defined relationships to a master signal. The defined relationships include but are not limited to coincident tracking, offset tracking, ratiometric tracki |
| 7330065 |
Inrush current slew control circuit and method |
February 12, 2008 |
| Circuitry and methodology for controlling a FET or another transistor device provided to supply power to a circuit board insertable into a live backplane to provide inrush current slew rate control. The FET control circuit is responsive to an input signal variable in a preset manner to |
| 7323928 |
High capacitance integrated circuits |
January 29, 2008 |
| An integrated circuit providing high equivalent capacitance ranging from a few tens of picofarads to a few nanofarads is presented. The integrated circuit includes active integrated circuit components, requires no external capacitor, and is substantially insensitive to transistor cur |
| 7321203 |
LED dimming control technique for increasing the maximum PWM dimming ratio and avoiding LED flic |
January 22, 2008 |
| Circuitry and methodology for providing LED dimming control in a LED driving system having a switching regulator for providing power supply to drive the LED. The switching regulator includes a switching circuit to which an oscillation signal is applied to control switching of the swi |
| 7317357 |
High linearity low noise variable gain amplifier with continuous gain control |
January 8, 2008 |
| A variable gain amplifier comprises a plurality of serially connected transistor cells, in which each of the transistor cells has a plurality of connecting terminals. The first terminals of the transistor cells are serially coupled together to receive a first input voltage. The second |
| 7301387 |
Squaring cell implementing tail current multipication |
November 27, 2007 |
| A current squaring cell is provided for producing an output current that correlates to the square of an input signal current. The current squaring cell comprises a first circuit portion, which receives a first tail current that is positively proportional to the input signal current, and |
| 7292076 |
Low voltage pull-down circuit |
November 6, 2007 |
| A low voltage pull-down circuit for maintaining a node at a logic LOW voltage is provided. When a logic LOW is desired, the circuit provides a low-impedance path from the node to ground. The node may be pulled-up to a logic HIGH voltage, for example, by removing the low-impedance path an |
| 7268608 |
Wideband squaring cell |
September 11, 2007 |
| A squaring cell comprises a first circuit responsive to an input voltage to produce a corresponding current, and a second circuit, preferably in the form of an absolute modulator circuit, responsive to the current produced by the first circuit and to the input voltage to produce an o |
| 7265591 |
CMOS driver with minimum shoot-through current |
September 4, 2007 |
| A CMOS driver with minimum shoot-through current is disclosed. The potential for shoot-through current may be eliminated or reduced with a break-before-make circuit driving an output stage. The break-before-make circuit may include a first logic element followed by a first inverter a |
| 7265524 |
Adaptive control for inducer based buck-boost voltage regulators |
September 4, 2007 |
| Voltage regulators and methods for regulating voltages are disclosed. A switching circuit with an inductor and a plurality of switches may be used to produce a regulated voltage from an unregulated voltage source. A control circuit may be used to monitor the voltages at the input and |
| 7262661 |
Variable gain amplifier with temperature compensation and gain linearity enhancement |
August 28, 2007 |
| A variable gain amplifier contains a plurality of differential transistor pairs. A temperature dependent current is generated in the current path of each differential transistor pair. A generated gain control current is converted to a temperature dependent gain control current and applie |
| 7259620 |
Wide dynamic range switching variable gain amplifier and control |
August 21, 2007 |
| A plurality of variable gain amplifier stages are coupled by an attenuation circuit that receives a voltage input to be amplified. A control circuit activates each of the variable gain amplifier stages in a seamless manner in accordance with a control signal applied to a voltage cont |
| 7256721 |
Network with multiple adjustment elements and sensitivities, and digital-to-analog converter imp |
August 14, 2007 |
| A network comprises an arrangement of regular structures and merged structures, in which the regular structures each comprise one or more mutually identical fixed elements and an equal number of adjustable elements of equal value, and the adjustable elements each comprising two or mo |
| 7256570 |
Light load current-mode control for switched step up-step down regulators |
August 14, 2007 |
| A switched regulator circuit provides step-up and step-down operation at high efficiency during light load conditions. Switching loss is reduced in a four switch arrangement by limiting bottom MOSFET switching frequency. The possibility of overcharge in boost mode operation has been |
| 7246016 |
Circuits and methods for current measurements referred to a precision impedance |
July 17, 2007 |
| Circuitry and methods for obtaining accurate measurements of current supplied by an integrated circuit are provided. Current calculations are performed using information from a precision termination resistor and from the ratio relationship of two on-chip resistors. The invention prov |
| 7245189 |
High linearity digital variable gain amplifier |
July 17, 2007 |
| Variable gain amplifiers offering high frequency response with improved linearity and reduced power dissipation are provided. An amplifier is disclosed that is constructed from a one-stage topology with multiple signal paths and compensation networks for improved linearity and stable |
| 7239251 |
Multi-bit digital input using a single pin |
July 3, 2007 |
| Electronic devices, and methods, for transmitting, transferring and/or conveying a multi-bit digital signal as a voltage signal via a single pin. Devices and methods according to the invention substantially reduce the pin count of a device because inputting of a multi-bit digital signal |
| 7230497 |
System for controlling frequency of oscillator |
June 12, 2007 |
| System for controlling the frequency of an oscillator. A first circuit is coupled to the oscillator and arranged for receiving an externally provided clock signal at a first input node. A second circuit coupled to the oscillator is arranged for receiving an externally provided frequency |
| 7230412 |
Distinguishing network interface card from short circuit condition in power over ethernet system |
June 12, 2007 |
| Novel system and methodology for distinguishing a Network Interface Card (NIC) from a short circuit condition in a Power over Ethernet (PoE) system. A system for providing power to a powered device (PD) includes a PD probing circuit that generates a detection signal supplied to a device |
| 7224204 |
Method and circuit for driving a gate of a MOS transistor negative |
May 29, 2007 |
| A method and circuit for driving the gate of a MOS transistor having a negative or low threshold voltage negative, in which the driving circuit is formed on a single chip. A negative voltage is generated from a positive voltage to drive the gate of the MOS transistor negative. The MO |
| 7218171 |
Voltage offset measurement for calibration of an integrated circuit amplifier |
May 15, 2007 |
| Voltage offset of an integrated circuit amplifier is accurately determined for calibration of the device. Circuit connections are established between the integrated circuit and an external device, such as an IC handler. Internal noise gain resistors formed within the integrated circu |
| 7218082 |
Compensation technique providing stability over broad range of output capacitor values |
May 15, 2007 |
| A disclosed amplifier and buffer circuit, for example for a linear voltage regulator, comprises an input gain stage, an integrator and a unity-gain output stage. An output stage compensation scheme enables stable operation over a broad range of output capacitance. For low to moderate |
