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| Number | Title | Issue Date |
| 8154898 | Current driven bipolar high voltage driver for capacitive loads A circuit for generating a high voltage alternating current to drive a load has a current source having a first terminal and a second terminal. The circuit further has an output terminal and a circuit ground terminal. A first switch will conduct between the first te... | 04/10/2012 |
| 8147409 | Method and apparatus for transducer excitation in medical ultrasound imaging A method of transducer excitation in medical ultrasound imaging. Based on a stepped approximation of Gaussian modulated cosines, the transmit waveform provides bandlimited spectrum and low level of second order harmonics while retaining the duration of the transmitt... | 04/03/2012 |
| 8138805 | Complementary high voltage switched current source integrated circuit A complementary high voltage switched current source circuit has a complementary current source pair, wherein a first of the current source pair is coupled to a positive voltage rail and a second of the current source pair is coupled to a negative voltage rail. A di... | 03/20/2012 |
| 8130519 | Led driver with low harmonic distortion of input AC current and methods of controlling the same A power supply circuit for powering a load at constant current has a rectifier stage for receiving an AC voltage input and for producing a first substantially DC voltage. A first capacitor is attached to the load. A charge-pump is attached to an output of the rectif... | 03/06/2012 |
| 8106597 | High efficiency boost LED driver with output A current driver for powering a string of LEDs has a boost converter coupled to an input voltage source. A voltage multiplier circuit is coupled to the boost converter and to the string of LEDs. A latch is provided having an output coupled to the boost converter. A ... | 01/31/2012 |
| 8013640 | Programmable ultrasound transmit beamformer integrated circuit and method An electrical waveform generating circuit has a programmable current source-driver. A digital switched current source is coupled to the programmable current source-driver and controlled by waveforms stored in the programmable current source-driver. A plurality of MO... | 09/06/2011 |
| 7986178 | Pulse width modulation driver for electroactive lens An electroactive lens driver generates a variable root-mean-square drive voltage for controlling an electroactive lens by controlling the duty cycle of a modified square wave. ... | 07/26/2011 |
| 7977820 | Ultrasound transmit pulse generator A ultrasound transmit pulse waveform generator for driving a piezoelectric transducer in medical ultrasound imaging, nondestructive testing (NDT) ultrasound imaging applications, includes a capacitor, switching programmable current sources, and a power amplifier. | 07/12/2011 |
| 7956653 | Complementary high voltage switched current source integrated circuit A complementary high voltage switched current source circuit has a complementary current source pair, wherein a first of the current source pair is coupled to a positive voltage rail and a second of the current source pair is coupled to a negative voltage rail. A di... | 06/07/2011 |
| 7948315 | Low noise binary-coded gain amplifier and method for time-gain compensation in medical ultrasound imaging A low noise variable gain amplifier and method for processing received signals in an ultrasound medical imaging system is disclosed. Unlike solutions known from the prior art, the signals are amplified by a binary-coded gain amplifier having its amplification factor... | 05/24/2011 |
| 7893714 | High voltage analog multiplex switch integrated circuit architecture An integrated circuit high voltage analog switch has digital logic-level control interface circuit. A level translator is coupled to the digital logic-level control interface circuit. A plurality of output multi-channel high voltage switches is coupled to the level ... | 02/22/2011 |
| 7889787 | Ultrasound transmit beamformer integrated circuit and method The invention provides a novel method of transmit beamforming, which allows compact analog implementation of complex digital algorithms without compromising their features. It is aimed to support envelope shaping, apodization, and phase rotation per channel and per ... | 02/15/2011 |
| 7863836 | Control circuit and method for regulating average inductor current in a switching converter A switching power converter has an input voltage source. An output load is coupled to the input voltage source. An inductive element is coupled to the load. A switch is coupled to the inductive element. A current reference input is provided. A control circuit is cou... | 01/04/2011 |
| 7813048 | Inductorless electroactive lens driver and system An electroactive lens driver comprises a voltage generator generating a high alternating current voltage signal for application to an electroactive lens in response to a low direct current voltage signal. The voltage generator does not include an inductor or a trans... | 10/12/2010 |
| 7723926 | Shunting type PWM dimming circuit for individually controlling brightness of series connected LEDS operated at constant current and method therefor A dimming circuit for driving a string of LEDs at constant current has a power converter. A control circuit is coupled to the power converter. A plurality of shunt switches is provided. An individual shut switch is coupled to each LED. Each LED can be shunted indivi... | 05/25/2010 |
| 7564263 | High-speed logic signal level shifter A high speed logic signal level shifter is comprised of: a logic signal buffer for receiving logic signal information and having true and complement state differential outputs; a binary flip-flop circuit with set and reset inputs; a first coupling capacitor connecte... | 07/21/2009 |
| 7561452 | Transformer-isolated flyback converters and methods for regulating output current thereof A system and method for delivering regulated power and current to an output load has a flyback transformer having a primary winding and a secondary winding. The secondary winding delivers stored energy to the output load. An oscillator circuit is provided for genera... | 07/14/2009 |
| 7554378 | Fast DC coupled level translator A level translator has an inverter comprising a first transistor having a first predetermined voltage threshold and a second transistor having a second predetermined voltage threshold. The two transistors have control gates being of complementary conductivity. A fir... | 06/30/2009 |
| 7554272 | Low noise electroluminescent lamp (EL) driver and method therefor An EL driver circuit has a full H-bridge circuit. A boost converter is coupled to the full H-bridge circuit. The boost converter is pulse width modulated to generate a gradual increase in voltage to be applied to the full H-bridge circuit to drive an EL lamp. ... | 06/30/2009 |
| 7538581 | Fast AC coupled level translator A level translator has a pair of transistors, wherein a first transistor of the pair of transistors and a second transistor of the pair of transistors are complimentary. A pair of capacitors are provided, wherein a first capacitor of the pair of capacitors is couple... | 05/26/2009 |
| 7513873 | Low-noise ultrasound method and beamformer system for doppler processing An ultrasonic low-noise analog beamformer for Doppler acquisition achieves high sensitivity by translating the frequency of the ultrasound echoes to an intermediate frequency, which is well above of the 1/f corner. This is accomplished by beamforming the downconvert... | 04/07/2009 |
| 7498754 | Architecture for driving multiple loads at constant current A circuit for driving an array of Light Emitting Diode (LED) strings at a constant current has a plurality of LEDs. A plurality of LED drivers is provided wherein a single LED driver is coupled to each of the plurality of LEDs. A voltage reference generator is used ... | 03/03/2009 |
| 7480191 | High speed logic level shifter A circuit for transmitting logic signals across a high voltage barrier has a logic signal buffer with true and complement state differential outputs. A binary flip-flop with set and reset inputs is further provided. A first coupling capacitor is coupled to the true ... | 01/20/2009 |
| 7453307 | Process independent voltage controlled logarithmic attenuator having a low distortion and method therefor A process independent voltage controlled logarithmic attenuator has an attenuator control stage block having a first input coupled to a controlled input and a second input coupled to an offset generator. An attenuator transistor is coupled to the attenuator controll... | 11/18/2008 |
| 7417483 | Wide-band wide-swing CMOS gain enhancement technique and method therefor A regulated cascode current source has a current source circuit. A level shifter circuit is coupled to the current source circuit. The level shifter circuit has a circuit for independently controlling a voltage on a cascode node. ... | 08/26/2008 |
| 7362253 | Introduction to R2RC D/A converter A Digital to Analog (D/A) converter has a plurality of stages. Each of the plurality of stages has a first resistive element. A second resistive element is coupled to the first resistive element and has approximately twice a resistive value of the first resistive el... | 04/22/2008 |
| 7336122 | Low power high side current monitor which operates at high voltages and method therefor A low power high side current monitor has an input terminal and a load terminal. A current sensing element is coupled to the input terminal and the load terminal. A first resistor is coupled to the input terminal. A first pair of transistors is coupled together and ... | 02/26/2008 |
| 7330364 | Device for converting high voltage alternating current (AC) to low voltage direct current (DC) and method therefor A method and circuit for converting high voltage AC to low voltage DC using a switched power supply and rising edge conduction has an alternating current (AC) power source. A rectifier is coupled to the AC power source. A switching device is coupled to the rectifier... | 02/12/2008 |
| 6992509 | Switched-capacitor sample/hold having reduced amplifier slew-rate and settling time requirements A switched-capacitor sample/hold circuit and method having reduced slew-rate and settling time requirements provides for lower-cost and/or lower-power implementation of sample/hold circuits and/or reduced error due to amplifier characteristics. The switched-capacito... | 01/31/2006 |
| 6958920 | Switching power converter and method of controlling output voltage thereof using predictive sensing of magnetic flux A switching power converter and method of controlling an output voltage thereof using predictive sensing of magnetic flux provides a low-cost switching power converter via primary-side control using a primary-side winding. An integrator generates a voltage that repr... | 10/25/2005 |
| 6940733 | Optimal control of wide conversion ratio switching converters A switch state controller generating a pulse train is used in a power converter utilizing a plurality of converter stages all simultaneously controlled by a single switch controlled by said pulse train. On time of the pulse train is controlled according to an input ... | 09/06/2005 |
| 6917504 | Apparatus and method for adaptively controlling power supplied to a hot-pluggable subsystem An apparatus and method for adaptively controlling power supplied to a hot-pluggable subsystem controls the inrush current of the hot-pluggable subsystem when the subsystem is coupled to another system that supplies power, and optionally other signal connections. Th... | 07/12/2005 |
| 6841950 | Dimmable electrolumanescent lamp drivers and method therefor A method for dimmable control of a multiple output EL lamp driver is disclosed. The multiple output EL lamp driver has a power converter. A plurality of EL lamps are provided wherein one terminal of each EL lamp is coupled to a single common terminal. A plurality of... | 01/11/2005 |
| 6710773 | Inductorless method and apparatus for driving electroluminescent panels A inductorless method and apparatus for driving electroluminescent (EL) panels enables fabrication of an integrated circuit that provides a complete EL panel driver solution in one package. The high voltage required to drive the EL panel is generated by a plurality ... | 03/23/2004 |
| 6667583 | Method and apparatus for efficiently driving a low-voltage device from a wide-range input supply A method an apparatus for efficiently driving a low-voltage device from a wide-range input supply uses and inductor and a diode coupled in parallel to provide a high-efficiency energy storage circuit. The parallel diode/inductor circuit is coupled to a sw... | 12/23/2003 |
| 6555967 | Low noise method and apparatus for driving electroluminescent panels A low noise method and apparatus for driving electroluminescent (EL) panels provides reduction in EL panel noise, and in the preferred embodiment, voltage compensation as the EL panel ages. The output of a high voltage power supply is applied to the EL pa... | 04/29/2003 |
| 6525515 | Feedback apparatus and method for adaptively controlling power supplied to a hot-pluggable subsystem A feedback apparatus and method for adaptively controlling power supplied to a hot-pluggable subsystem controls the inrush current of the hot-pluggable subsystem upon application of power. The apparatus and method adaptively control a pass device by detec... | 02/25/2003 |
| 6304461 | DC power converter having bipolar output and bi-directional reactive current transfer A dc power converter having bipolar output and bi-directional reactive current transfer is disclosed. The dc power converter comprises: a direct current source; a modulator coupled to the direct current source, the modulator comprising at least two switch... | 10/16/2001 |
| 6169391 | Device for converting high voltage alternating current to low voltage direct current A device which rectifies and regulates high voltage alternating current without the use of transformers, large capacitive coupling circuits or high voltage linear regulators. The device includes a rectifier, a control circuit for sensing the output voltag... | 01/02/2001 |
| 6087863 | Method for improving the efficiency of discharging capacitive loads in H-bridge switching networks A method for improving the efficiency of H-bridge electrical switching devices that drive a capacitive load such as electroluminescent lamps, liquid crystal devices and piezoelectric transducers. The method provides for discharge steps that first discharg... | 07/11/2000 |
