Plural Selective Resistors Patents (Class 323/297)
  • Patent number: 10386881
    Abstract: A power supply circuit, its generating and control methods are presented, relating to smart wearable devices. The power supply circuit comprises a Bandgap voltage reference, a real-time detection and control circuit, and a substitute voltage source. The real-time detection and control circuit is connected to the Bandgap voltage reference and the substitute voltage source, and adjusts an output voltage of the substitute voltage source to match an output voltage of the Bandgap voltage reference. After these output voltages are equal, the output voltage of the power supply circuit is provided by the substitute voltage source, and the Bandgap voltage reference can be disconnected from the circuit. This circuit can lower the power consumption of the Bandgap voltage reference without affecting the stability of the voltage output.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: August 20, 2019
    Assignees: SEMICONDUCTOR MANUFACTURING INTERNATIONAL (SHANGHAI) CORPORATION, SEMICONDUCTOR MANUFACTURING INTERNATIONAL (BEIJING) CORPORATION
    Inventors: Chia Chi Yang, Chen Yi Huang, Zhi Bing Deng, Cheng Tai Huang, Wen Jun Weng
  • Patent number: 9634491
    Abstract: A power manager including a power bus operable at a DC bus voltage. A plurality of device ports operably connect to the power bus. A first data processing device and a first memory device are associated with the first data processing device. A data communication channel extends between the first data processing device and each of the plurality of device ports. An energy management schema operates on the first data processing device. For each of the plurality of device ports, the energy management schema establishes a communication link with an external power device connected to the device port over the data communication channel and determines if an external power device is connected to the device port and if so, determines an external power device type.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: April 25, 2017
    Assignee: Protonex Technology Corporation
    Inventors: Philip T. Robinson, Seth M. Dziengeleski, James D. Kazmierczak, David J. Holigan
  • Patent number: 8922190
    Abstract: A band gap reference voltage generator has first and second current conduction paths between a first node and a second node. The first current conduction path has first resistive elements in series with a first forward-biased PN junction element. A tap is connected selectively to the first resistive elements through switches that are controllable to select a voltage divider ratio at the tap. The second current conduction path includes a second resistive element in series with a second PN junction element of greater current density than the first PN junction. A voltage error amplifier has inputs connected to the tap and the second PN junction element, and an output for providing a thermally compensated output voltage VREF. A feedback path applies the output voltage VREF through a third resistive element to the first node.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: December 30, 2014
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Jianzhou Wu, Yang Wang
  • Patent number: 8890503
    Abstract: A power supply has first and second reference voltage sources; a step-down voltage generator, including a transistor supplied with a first voltage, a resistor string between the transistor and a second voltage, and an op-amp which controls the transistor, and outputting the voltage at a first node among nodes in the resistor string; switches, coupled to the nodes; a comparison circuit, which compares the voltage at a common node the switches coupling in common with the second reference voltage source; and a calibration control circuit, which selects any switch according to a comparison result to calibrate. During calibration, the calibration control circuit couples a second node among the nodes to a non-inverting terminal of the op-amp, and the first reference voltage source to an inverting terminal of the op-amp, and after calibration, couples the common node to the non-inverting terminal, and the second reference voltage source to the inverting terminal.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: November 18, 2014
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Hiroto Kodama, Akimitsu Tajima, Hideaki Kondo, Osamu Moriwaki
  • Patent number: 8803502
    Abstract: A voltage regulator includes a voltage generation unit, a first resistor section, and a second resistor section. The voltage generation unit compares a reference voltage level with a voltage level of a first node and generates an output voltage. The first resistor section includes a first sub-resistor and a second sub-resistor between the first node and a ground voltage node, and controls a connection between the first sub-resistor and the second sub-resistor to change a resistance value of the resistors. The second resistor section includes a reference resistor, a plurality of unit resistors, and a plurality of step resistors, and controls connections of the unit resistors and the step resistors to change a resistance value of the resistors.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: August 12, 2014
    Assignee: SK Hynix Inc.
    Inventor: Hyun Chul Lee
  • Patent number: 8633681
    Abstract: A voltage regulator includes a voltage output unit configured to output an output voltage to a voltage output terminal; a first resistance divider configured to regulate a divided resistance value in response to a first series of control signals; and a second resistance divider configured to regulate the divided resistance value, which is determined in the first resistance divider, in response to a second series of control signals. A voltage level of the output voltage output through the voltage output terminal is regulated according to a ratio of the divided resistance value determined through the first resistance divider and the second resistance divider and a resistance value of a reference resistor.
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: January 21, 2014
    Assignee: SK Hynix Inc.
    Inventor: Gyo Soo Chu
  • Patent number: 8610421
    Abstract: A current generator includes an op-amp having a negative terminal arranged to be coupled to an input voltage, a resistance selection circuit having at least one tunable resistor connected with each other, and at least one power transistor. A gate of the at least one power transistor is coupled to an output of the op-amp, and a drain of the at least one power transistor is coupled to the at least one tunable resistor or a load. The resistance selection circuit is configured to select a node of the at least one tunable resistor based on the input voltage for coupling from a positive terminal of the op-amp. The at least one tunable resistor is configured to adjust a resistance setting to control a current level of the current generator based on a power supply voltage or a current of a reference resistor.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: December 17, 2013
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Ming-Chieh Huang, Chan-Hong Chern, Chih-Chang Lin
  • Patent number: 8593121
    Abstract: The present disclosure discloses a voltage regulator including a trimming circuit. The present disclosure also discloses a method for trimming an output voltage of a voltage regulator. In one embodiment the voltage regulator may include a power conversion module, a feedback and trimming module and a control module. The voltage regulator may be able to provide an output voltage that could be regulated to a plurality of output values, the feedback and trimming module may be able to trim the plurality of output values to their desired values successively and independently.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: November 26, 2013
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yike Li, Jiangyun Zhou
  • Patent number: 8476876
    Abstract: A voltage-modulated circuit device uses a power source of a modulation circuit to acquire a predetermined trigger voltage through a voltage acquisition circuit and a step-down circuit to step down a voltage, and then a voltage amplification circuit amplifies the voltage by several times, such that the trigger voltage amplified by several times still falling within the range of predetermined voltage values triggers and conducts a switch circuit, and the power source of the modulation circuit can flow from an anode to a cathode in order to supply an electric power with a step-down voltage. With the design of triggering the conduction, the voltage of the modulation circuit can be modulated automatically to maintain the electric power supplied to the circuit device within the range of required voltage values, only if the trigger voltage has the predetermined voltage value.
    Type: Grant
    Filed: July 27, 2010
    Date of Patent: July 2, 2013
    Inventor: Ta-I Liu
  • Publication number: 20130082998
    Abstract: A voltage generator circuit comprises a resistor string, a drive mechanism configured to drive a drive signal, a voltage feedback network, and a voltage tap point. The voltage tap point is located along the resistor string. The voltage tap point is configured to be selectively coupled simultaneously with the drive mechanism and the voltage feedback network, such that an output of the voltage tap point is selectively coupled with the drive mechanism via the voltage feedback network.
    Type: Application
    Filed: September 30, 2011
    Publication date: April 4, 2013
    Inventor: Imre KNAUSZ
  • Patent number: 8350552
    Abstract: A highly accurate voltage reference and temperature sensor circuit requires only several low-cost components in addition to a general-purpose microcontroller with an analog-to-digital converter. Unlike known circuits, the circuit disclosed does not rely on matching between a pair of semiconductor devices, as only a single semiconductor junction is used. All of the signal processing may be performed digitally.
    Type: Grant
    Filed: December 5, 2011
    Date of Patent: January 8, 2013
    Assignee: Sendyne Corporation
    Inventor: Victor Marten
  • Patent number: 8248055
    Abstract: A voltage reference containing a programmable resistance portion at an output node at which an output reference voltage is provided. The desired magnitude of the programmable portion which provides optimum matching of an output resistance of the voltage reference and a series resistance of an output capacitor of the voltage reference is determined and hard-programmed. As a result, the output voltage of the voltage reference is provided with improved linearity. In an embodiment, the determination of the magnitude of the programmable portion is performed by providing an input to an analog to digital converter (ADC) with the voltage reference driving the ADC. The resistance setting corresponding to the third harmonic being less than a desired threshold is then hard-programmed. In an alternative embodiment, the programmable portion is set to specific resistance dynamically during operation.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: August 21, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Visvesvaraya Appala Pentakota, Anand Hariraj Udupa
  • Publication number: 20120153923
    Abstract: A method and an apparatus for supplying power to a 300 PIN MSA 40 Gb TRANSPONDER (22), wherein the apparatus comprises a power supply control module (21), a first resistor (R2), a second resistor (R3) and a third resistor (R4). The power supply control module (21) supplies power to the TRANSPONDER (22) through the APS Digital pin (APS Digital) of the TRANSPONDER (22). A reference voltage terminal (Vfeedback) of the power supply control module (21) is connected to the APS Sense pin (APS Sense) of the TRANSPONDER (22) by the second resistor (R3), connected to the APS Set pin (APS Set) of the TRANSPONDER (22) by the first resistor (R2) and connected to the bias voltage terminal (Vbias) of the power supply control module (21) by the third resistor (R4). The method and the apparatus can increase selection of the power supply control module (21) without occupying excessive space of circuit board, while ensuring precision of supply voltage.
    Type: Application
    Filed: December 21, 2009
    Publication date: June 21, 2012
    Applicant: ZTE CORPORATION
    Inventor: Xueyu Yu
  • Publication number: 20120112725
    Abstract: The present disclosure discloses a voltage regulator comprising a trimming circuit. The present disclosure also discloses a method for trimming an output voltage of a voltage regulator. In one embodiment the voltage regulator may comprise a power conversion module, a feedback and trimming module and a control module. The voltage regulator may be able to provide an output voltage that could be regulated to a plurality of output values, the feedback and trimming module may be able to trim the plurality of output values to their desired values successively and independently.
    Type: Application
    Filed: October 27, 2011
    Publication date: May 10, 2012
    Inventors: Yike Li, Jiangyun Zhou
  • Patent number: 8138741
    Abstract: A voltage generator is provided. The voltage generator includes a voltage pump and a voltage controller. The voltage pump generates a target voltage using a clock signal. The voltage controller compares a temporary voltage input from the voltage pump with a reference voltage to generate a control signal controlling the voltage pump. The voltage controller includes a string of a plurality of resistors connected in series to change a level of the temporary voltage to a voltage level of a corresponding comparison voltage. When the plurality of resistors are in a string, a resistance of a resistor closest to one end of the string is greater than resistances of other resistors of the string. The voltage controller may further include a jumping unit controlling connection or disconnection of two arbitrary nodes among first to n-th nodes (where n is a natural number) defined as connection points of the adjacent resistors of the string.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: March 20, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jin-kook Kim, Joon Young Kwak
  • Patent number: 8085030
    Abstract: A voltage generator includes a charge pump, a voltage dividing circuit, and a comparator. The charge pump can output a high voltage. The dividing circuit includes a plurality of resistors and at least one switch. The dividing circuit can generate a first divided voltage of the high voltage when the switch is turned on and a second divided voltage of the high voltage when the switch is turned off. An output signal of the comparator can control the switch and the charge pump. The dividing circuit and the comparator form a feedback loop so that the response speed of the comparator can be increased and the ripples of the high voltage outputted from the charge pump can be decreased.
    Type: Grant
    Filed: May 20, 2008
    Date of Patent: December 27, 2011
    Assignee: NOVATEK Microelectronics Corp.
    Inventor: Tzung-Shing Tsai
  • Patent number: 8022852
    Abstract: This invention provides a digital-analog converter circuit capable of appropriately correcting the optical characteristics of the liquid crystals according to the change in design or the preference of the user, and achieving goals of miniaturization, cost-lowering, as well as wide design suitability. The digital-analog converter circuit includes a storage device for storing a voltage characteristic curve, a modulating device for generating a frequency signal in accordance with a data from the voltage characteristic curve stored in the storage device in response to a selected data, a variable resistance device connected between a first power source and a second power source, in which the resistance value of the variable resistance device is changed in accordance with the frequency signal from the modulating device, a holding device for holding a voltage generated at the variable resistance device, and an output device for outputting the voltage to a desired output end.
    Type: Grant
    Filed: August 8, 2008
    Date of Patent: September 20, 2011
    Assignee: Chimei Innolux Corporation
    Inventor: Keitaro Yamashita
  • Patent number: 7965065
    Abstract: A trimming circuit which comprises a shunt circuit having two shunt resistors and two shunt ON/OFF switches and connected in parallel with a series resistor circuit. The middle point of the shunt circuit is connected to a connection point of the series resistor circuit, the resistance ratio thereof with respect to the connection point being equal to the resistance ratio of the shunt resistors.
    Type: Grant
    Filed: July 16, 2008
    Date of Patent: June 21, 2011
    Assignee: Oki Semiconductor Co., Ltd.
    Inventor: Akihiro Hirota
  • Patent number: 7940035
    Abstract: A standby circuit is provides to on/off a power converter for power saving. The standby circuit includes a comparison circuit. The comparison circuit is coupled to a feedback loop of the power converter to generate a mode signal when a feedback signal of the feedback loop is lower than a threshold signal. A resistive device is coupled to the feedback loop. The resistance of the resistive device is increased in response to the mode signal. The mode signal is further coupled to turn off a switching control circuit of the power converter.
    Type: Grant
    Filed: January 19, 2007
    Date of Patent: May 10, 2011
    Assignee: System General Corp.
    Inventor: Ta-yung Yang
  • Patent number: 7884585
    Abstract: The present invention relates to voltage converters and especially to a control circuit with an input from the voltage converter output and arranged to control the voltage level on the voltage converter output. The problem addressed relates to the situation when there is a pre-bias voltage on the converter output at the moment it is switched on. The object of the control circuit is to increase the voltage on the converter output fast and avoiding any drain of voltage or current from the output at the start up sequence. This is performed by a comparator in the control circuit that is arranged to compare the reference voltage with a division of the output voltage and if the reference voltage is lower that the divided output voltage the reference voltage is increased at the comparator output. The comparator circuit includes an OP-amplifier.
    Type: Grant
    Filed: July 6, 2006
    Date of Patent: February 8, 2011
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventor: Mikael Appelberg
  • Patent number: 7855899
    Abstract: A control circuit is provided to generate a mode signal at light load of the power converter. The mode signal is coupled to disable the switching signal for saving power. The impedance of an input circuit is increased in response to the mode signal. Furthermore, a soft start circuit is initiated by the mode signal when switching signal is enabled. An external capacitor associates with the impedance of the input circuit determine the off period of the switching signal.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: December 21, 2010
    Assignee: System Genreal Corp.
    Inventor: Ta-yung Yang
  • Patent number: 7814348
    Abstract: In one aspect, there is disclosed a power management device that includes a housing, at least one input port, and at least one output port. Also included is a CPU and a user interface. Electrical circuitry connects the ports, CPU and user interface. The CPU includes a real-time operating system and programs actively controlling a power usage.
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: October 12, 2010
    Assignee: Adaptive Materials, Inc.
    Inventors: Jason B. Krajcovic, Timothy LaBreche, Aaron Crumm
  • Publication number: 20100060253
    Abstract: The present invention relates to voltage converters and especially to a control circuit with an input from the voltage converter output and arranged to control the voltage level on the voltage converter output. The problem addressed relates to the situation when there is a pre-bias voltage on the converter output at the moment it is switched on. The object of the control circuit is to increase the voltage on the converter output fast and avoiding any drain of voltage or current from the output at the start up sequence. This is performed by a comparator in the control circuit that is arranged to compare the reference voltage with a division of the output voltage and if the reference voltage is lower that the divided output voltage the reference voltage is increased at the comparator output. The comparator circuit includes an OP-amplifier.
    Type: Application
    Filed: July 6, 2006
    Publication date: March 11, 2010
    Inventor: Mikael Appelberg
  • Patent number: 7619502
    Abstract: A potentiometer network includes a first main terminal, a second main terminal, a plurality of resistive elements connected in parallel between the first main terminal and the second main terminal, and means for embedding calibration of said resistive elements in said potentiometer network.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: November 17, 2009
    Assignee: Honeywell International Inc.
    Inventors: Joy P. Prabhakaran, Jyothi K. N. Setty
  • Patent number: 7619402
    Abstract: A programmable voltage generator has software-programmable registers that may be decoded to generate control bits that turn on select transistors that control a variable resistor network. An external power voltage is input to a regulator transistor, which has a channel resistance controlled by a gate voltage. The channel resistance of the regulator transistor produces a regulated voltage as an output. An op amp compares a reference voltage to a feedback voltage to generate the gate voltage. The feedback voltage is taken from a tap within the variable resistor network. The variable resistor network has select transistors that select one resistor between the regulated voltage and an upper node, and that select one resistor between a lower node and ground. Switches select a tap within a series of resistors between the upper and lower nodes. Y (fine) control bits select the tap while X (coarse) control bits enable select transistors.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: November 17, 2009
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventor: Kwok Kuen David Kwong
  • Publication number: 20090079411
    Abstract: To provide a variable voltage dividing circuit capable of changing voltage values of a detection point and a release point along with a change in power supply voltage without changing a hysteresis width.
    Type: Application
    Filed: August 15, 2008
    Publication date: March 26, 2009
    Applicant: Seiko Instruments Inc.
    Inventor: Minoru ARIYAMA
  • Publication number: 20070257654
    Abstract: In one aspect, there is disclosed a power management device that includes a housing, at least one input port, and at least one output port. Also included is a CPU and a user interface. Electrical circuitry connects the ports, CPU and user interface. The CPU includes a real-time operating system and programs actively controlling a power usage.
    Type: Application
    Filed: April 25, 2007
    Publication date: November 8, 2007
    Inventors: Jason B. Krajcovic, Timothy LaBreche, Aaron Crumm
  • Patent number: 7292019
    Abstract: The control precision of one or more parameters of an integrated circuit (IC), for example the output voltage of a voltage regulator comprised in the IC, may be improved even when using inaccurate components external to the IC. Control of the output voltage, or any parameter, using components external to the IC may include coupling a resistor to the IC and measuring the actual resistance value of the resistor, and based on the measured value, selecting a nominal resistance value from a set of resistance values previously specified by the user. The output voltage, or parameter, may be generated according to the nominal resistance value instead of the actual resistance value, thereby reducing the error that may be incurred due the actual resistance value of the resistor not matching the expected nominal value of the resistor.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: November 6, 2007
    Assignee: Zilker Labs, Inc.
    Inventor: Kenneth W. Fernald
  • Patent number: 7196570
    Abstract: Fuse circuit designs and the use thereof are disclosed. In one example, a fuse circuit providing predictable total resistances for multiple rounds of programming comprises a predetermined number of fuse stages coupled in series. Each stage comprises a first and a second connecting nodes, a fuse connected between the first and second connecting nodes, a first resistor with its first end connected to the first connecting node, and a second resistor with its first end connected to the second connecting node, wherein the first and second resistors connect to a third and a fourth connecting nodes, which are the first and second connecting nodes of a next fuse stage respectively, through their second ends.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: March 27, 2007
    Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
    Inventor: Shine Chien Chung
  • Patent number: 7071669
    Abstract: A reference voltage generation circuit includes first to third resistance ladder circuits. The first resistance ladder circuit has at least one variable resistance circuit in which a resistance value between both ends is variable, and outputs multi-valued reference voltages. The second resistance ladder circuit has series-connected resistance circuits each of which has a fixed resistance value, and outputs a plurality of reference voltages. The third resistance ladder circuit has at least one variable resistance circuit in which a resistance value between both ends is variable, and outputs multi-valued reference voltages. The first to third resistance ladder circuits are connected in series between first and second power supply lines. The resistance values of the variable resistance circuits in the first and third resistance ladder circuits are variably controlled by a given command or a variable control signal input through an external input terminal.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: July 4, 2006
    Assignee: Seiko Epson Corporation
    Inventor: Akira Morita
  • Patent number: 6922046
    Abstract: An impedance network. The network includes a plurality of impedance elements, at least one end terminal, and a wiper terminal. The network also includes a first plurality of switching elements selectively providing tap positions to the at least one end terminal, selectable at a first specified increment of impedance elements in the plurality of impedance elements. The network further includes a second plurality of switching elements selectively providing a tap positions to the wiper terminal, selectable at a second specified increment of impedance elements in the plurality of impedance elements.
    Type: Grant
    Filed: April 2, 2004
    Date of Patent: July 26, 2005
    Assignee: Winbond Electronics Corporation
    Inventors: Chun-Mai Liu, Hagop A. Nazarian
  • Patent number: 6882136
    Abstract: An impedance network, which includes at least one end terminal, a wiper terminal, a center impedance element, and a first plurality of impedance elements. The wiper terminal provides a tap position at a selected impedance value of the impedance network, selectable at a specified increment value. The first plurality of impedance elements is configured to reduce resistance variation during switching from one tap position to another tap position. The first plurality of impedance element is connected in series in a mirrored configuration about the center impedance element.
    Type: Grant
    Filed: May 26, 2004
    Date of Patent: April 19, 2005
    Assignee: Winbond Electronics Corporation
    Inventors: Hagop A. Nazarian, William Tang, Zhan Duan, Chao-Ming Tsai, Lawrence D. Engh
  • Patent number: 6788042
    Abstract: An impedance network, which includes at least one end terminal, a wiper terminal, a center impedance element, and a first plurality of impedance elements. The wiper terminal provides a tap position at a selected impedance value of the impedance network, selectable at a specified increment value. The first plurality of impedance elements is configured to reduce resistance variation during switching from one tap position to another tap position. The first plurality of impedance elements is connected in series in a mirrored configuration about the center impedance element.
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: September 7, 2004
    Assignee: Winbond Electronics Corporation
    Inventors: Hagop A. Nazarian, William Tang, Zhan Duan, Chao-Ming Tsai, Lawrence D. Engh
  • Patent number: 6744244
    Abstract: An impedance network. The network includes a plurality of impedance elements, at least one end terminal, and a wiper terminal. The network also includes a first plurality of switching elements selectively providing tap positions to the at least one end terminal, selectable at a first specified increment of impedance elements in the plurality of impedance elements. The network further includes a second plurality of switching elements selectively providing a tap positions to the wiper terminal, selectable at a second specified increment of impedance elements in the plurality of impedance elements.
    Type: Grant
    Filed: April 1, 2002
    Date of Patent: June 1, 2004
    Assignee: Winbond Electronics Corporation
    Inventors: Chun-Mai Liu, Hagop A. Nazarian
  • Patent number: 6707284
    Abstract: A progammable power supply for providing a regulated DC output power is disclosed. The power supply provides the output power to any one of a plurality of electronic devices adapted for receiving the output power at an operational voltage or an operational current. The power supply receives a programming signal to maintain the output power at the operational voltage or operational current associated with a particular selected electronic device. Accordingly, by varying the programming signal, the power supply can be programmed to provide output power to any one of several electronic devices having differing input power requirements.
    Type: Grant
    Filed: October 21, 2002
    Date of Patent: March 16, 2004
    Assignee: Comarco Wireless Technologies, Inc.
    Inventor: Thomas W. Lanni
  • Patent number: 6697060
    Abstract: A power supply circuit for generating potentials used to drive a liquid crystal, has first to fourth switches (101 to 104) connected in series between a high potential line (105) and a low potential line (106). The first to fourth switches are turned on and off by a switch drive circuit (107) so that the period of time in which the first and third switches are on and the period of time in which the second and fourth switches are on alternate. The power'supply circuit also has the first to third capacitors (111 to 113) of which the state of connection is switched alternately between serial and parallel by the switching operation of the switches. The potential between the second and third switches converges the middle potential between the potentials of the high and low potential lines by the alternate switching between series and parallel connections of the third capacitor (113) to the first and second capacitors (111, 112).
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: February 24, 2004
    Assignee: Seiko Epson Corporation
    Inventor: Masahiko Tsuchiya
  • Patent number: 6693413
    Abstract: A progammable power supply for providing a regulated DC output power is disclosed. The power supply provides the output power to any one of a plurality of electronic devices adapted for receiving the output power at an operational voltage or an operational current. The power supply receives a programming signal to maintain the output power at the operational voltage or operational current associated with a particular selected electronic device. Accordingly, by varying the programming signal, the power supply can be programmed to provide output power to any one of several electronic devices having differing input power requirements.
    Type: Grant
    Filed: May 7, 2002
    Date of Patent: February 17, 2004
    Assignee: Comarco Wireless Technologies, Inc.
    Inventor: Thomas W. Lanni
  • Patent number: 6690149
    Abstract: A power supply in accordance with the present invention includes: a resistance voltage-dividing circuit for generating an intermediate voltage, to which a targeted voltage value is allocated, from a supplied voltage; an N-type transistor which causes a current flow into from an outside when the intermediate voltage is higher than the targeted voltage value; a P-type transistor which outputs a current to the outside when the intermediate voltage is lower than the targeted voltage value; differential amplifier circuits having a voltage-follower arrangement, in each of the circuits the fluctuation acceptance range of the intermediate voltage with respect to the targeted voltage value being arranged so as to be equivalent to the difference between the operation-starting voltage of the N-type transistor and the operation-starting voltage of the P-type transistor; and resistances which activate either the P-type transistor or the N-type transistor so as to regulate the intermediate voltage by making the intermediat
    Type: Grant
    Filed: September 12, 2002
    Date of Patent: February 10, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masahiko Monomoushi, Masafumi Katsutani
  • Patent number: 6603280
    Abstract: A converter module which receives an AC voltage, converts the AC voltage to a DC voltage, and outputs the DC voltage to a circuit for driving a motor. The converter module includes a switching device, a diode, and a control circuit which controls the DC voltage output by the converter module by controlling the switching device. The control circuit includes a plurality of DC voltage detection terminals which detect the DC voltage output by the converter module with respective different DC voltage detection gains, a selector which selects at least one of the DC voltage detection terminals in accordance with an external signal indicative of a speed of the motor, and outputs a DC voltage detection value, and a controller which controls the DC voltage output by the converter module in accordance with the DC voltage detection value output by the selector.
    Type: Grant
    Filed: January 18, 2001
    Date of Patent: August 5, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Yasuo Notohara, Yukio Kawabata, Kazuo Tahara, Makoto Ishii, Yuhachi Takakura
  • Publication number: 20030128020
    Abstract: A progammable power supply for providing a regulated DC output power is disclosed. The power supply provides the output power to any one of a plurality of electronic devices adapted for receiving the output power at an operational voltage or an operational current. The power supply receives a programming signal to maintain the output power at the operational voltage or operational current associated with a particular selected electronic device. Accordingly, by varying the programming signal, the power supply can be programmed to provide output power to any one of several electronic devices having differing input power requirements.
    Type: Application
    Filed: December 5, 2002
    Publication date: July 10, 2003
    Applicant: COMARCO WIRELESS TECHNOLOGIES, INC.
    Inventor: Thomas W. Lanni
  • Patent number: 6556000
    Abstract: The electronic calibration equipment for verifying the high frequency characteristics of electronic test equipment, including oscilloscopes arid time interval analyzers is provided.
    Type: Grant
    Filed: December 13, 2000
    Date of Patent: April 29, 2003
    Assignee: Fluke Precision Measurement LTD
    Inventor: Simon Timothy Hollingworth
  • Patent number: 6555996
    Abstract: Disclosed are solid-state potentiometers having high resolution and high accuracy. An exemplary potentiometer comprises a first main terminal, a second main terminal, a wiper terminal, and a resistor stack comprising a plurality M of resistors coupled in series to one another at a plurality of M−1 internal nodes. Each of the resistors in the stack has substantially the same value of RS ohms. The potentiometer further comprises a first variable resistance network coupled between one end of the resistor stack and the potentiometer's first main terminal, and a second variable resistance network coupled between the other end of the resistor stack and the potentiometer's second main terminal. The first variable resistance network has a variable resistance value R1 which varies between zero ohms and RP ohms. The second variable resistance network has a variable resistance value R2 which is maintained substantially at value of (RP−R1).
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: April 29, 2003
    Assignee: Xicor, Inc.
    Inventors: Joseph Drori, Allan Ming-Lun Lin
  • Patent number: 6552519
    Abstract: A variable impedance network for the use in building potentiometers and digital-to-analog converters (DAC) is disclosed. The impedance network is constructed such that it reduces the overhead circuits associated with it compared to conventional approach. The percent reduction of overhead circuitry including the wiper transistors increases exponentially as the number of the taps required for the potentiometer increases.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: April 22, 2003
    Assignee: Winbond Electronics Corporation
    Inventor: Hagop A. Nazarian
  • Publication number: 20030042881
    Abstract: A progammable power supply for providing a regulated DC output power is disclosed. The power supply provides the output power to any one of a plurality of electronic devices adapted for receiving the output power at an operational voltage or an operational current. The power supply receives a programming signal to maintain the output power at the operational voltage or operational current associated with a particular selected electronic device. Accordingly, by varying the programming signal, the power supply can be programmed to provide output power to any one of several electronic devices having differing input power requirements.
    Type: Application
    Filed: October 21, 2002
    Publication date: March 6, 2003
    Applicant: COMARCO WIRELESS TECHNOLOGIES, INC.
    Inventor: Thomas W. Lanni
  • Patent number: 6489759
    Abstract: The voltage supply provides voltages to an electronic circuit requiring at least two different supply voltages. A plurality of standby supply voltages with different levels are obtained from the highest supply voltage with the aid of a voltage divider.
    Type: Grant
    Filed: November 20, 2000
    Date of Patent: December 3, 2002
    Assignee: Infineon Technologies AG
    Inventors: Pramod Acharya, Andreas Täuber
  • Patent number: 6455952
    Abstract: An adjustable circuit for voltage division comprises a serial resistor Rn(n=1, 2 . . . n) symmetrically mapped, connected in series, and paired in parallel with a switch Sn or Sn′ apiece, wherein the switches Sn and Sn′ are oppositely operated, namely, when the former is turned “ON/OFF”, the latter is turned “OFF/ON” to thereby hold the current unchanged to obtain desired output voltage(s) by proper control of the switches and accordingly a valid portion of voltage-dividing resistor &Dgr;R′.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: September 24, 2002
    Assignee: Topro Technology Inc.
    Inventor: Chi-Chang Wang
  • Patent number: 6331768
    Abstract: Disclosed are solid-state potentiometers having high resolution and high accuracy. An exemplary potentiometer has a first main terminal, a second main terminal, a wiper terminal, and a resistor stack having a plurality M of resistors coupled in series to one another at a plurality of M−1 internal nodes. Each of the resistors in the stack has substantially the same value of RS ohms. The potentiometer further has a first variable resistance network coupled between one end of the resistor stack and the potentiometer's first main terminal, and a second variable resistance network coupled between the other end of the resistor stack and the potentiometer's second main terminal. The first variable resistance network has a variable resistance value R1 which varies between zero ohms and RP ohms. The second variable resistance network has a variable resistance value R2 which is maintained substantially at value of (RP−R1).
    Type: Grant
    Filed: June 13, 2000
    Date of Patent: December 18, 2001
    Assignee: Xicor, Inc.
    Inventors: Joseph Drori, Allan Ming-Lun Lin
  • Patent number: 5883506
    Abstract: An arbitrary input AC voltage is applied from an external power supply (1) to a rectifying circuit (2), and one rectifying output end of the rectifying circuit is connected to a switching element (4) through a coil (3), while the other rectifying output end of the rectifying circuit is connected to a common terminal of the switching element through a detecting circuit (5) for a current waveform. Further, a peak value wave detecting circuit formed of a diode (6) and a capacitor (7) is connected in parallel with the switching element (4) so that a step-up chopper circuit is formed. A detecting circuit (10) for an output voltage having two resistors (9a), (9b) is connected between both ends of this capacitor (7). The one rectifying output end of the rectifying circuit (2) is connected to a detecting circuit (11) for an effective voltage value, and the two resistors (9a), (9b) for detecting the output voltage of the detecting circuit (10) are selected by a detecting signal of the detecting circuit (11).
    Type: Grant
    Filed: August 20, 1997
    Date of Patent: March 16, 1999
    Assignee: Sony Corporation
    Inventor: Tsuyoshi Masato
  • Patent number: 5818210
    Abstract: A reference voltage generating circuit outputs a reference voltage (used for comparison of magnitude with an analog voltage) at a plurality of levels by using a differential amplifier to amplify voltages at nodes formed by mutually adjacent resisters among a plurality of resistors comprising a ladder resistor unit which is optionally selected by a decoder and an analog switch unit.
    Type: Grant
    Filed: December 10, 1996
    Date of Patent: October 6, 1998
    Assignee: Kawasaki Steel Corporation
    Inventor: Masayuki Ueno
  • Patent number: 5717323
    Abstract: The present invention describes a resistance reference circuit that includes a reference resistor that is substantially independent of temperature variations to which the resistance reference circuit is subjected. Also provided is a resistor network that may be dependant upon the temperature variations, and a current source circuit that provides first and second currents to the reference resistor and the resistor network. A circuit that is responsive to voltages developed across the reference resistor and the resistor network modifies the resistance value of the resistor network such that its resistance value is maintained the same as that of the reference resistor.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: February 10, 1998
    Assignee: SGS-Thomson Microelectronics S.A.
    Inventor: Fran.cedilla.ois Tailliet