Temperature Compensation Of Semiconductor Patents (Class 323/907)
  • Patent number: 7327129
    Abstract: In a DC-to-DC converter, a current sense circuit and method generate a first current by a first transconductive amplifier responsive to the output current of the converter for a controller to switch a high side switch and a low side switch, a second current from a first voltage by a second transconductive amplifier, a second voltage from the second current by an adjustable resistor, and a bias signal from a difference between the second voltage and a third voltage by a bias apparatus to adjust the transconductances of the first and second transconductive amplifiers.
    Type: Grant
    Filed: April 6, 2005
    Date of Patent: February 5, 2008
    Assignee: Analog and Power Electronics Corp.
    Inventors: Ming-Hsueh Chen, Ming Chu Chien
  • Patent number: 7315461
    Abstract: An object of this power supply device is to enable an overheat protection level and an overvoltage protection level to be set accurately.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: January 1, 2008
    Assignee: Sanken Electric Co., Ltd.
    Inventor: Yoichi Kyono
  • Patent number: 7301321
    Abstract: A voltage reference circuit including a positive temperature coefficient current generator, a negative temperature coefficient current generator, and a first resistor is provided. In the positive temperature coefficient current generator, two transistors are operated in the weak inversion region, and a second resistor is connected in series between the gates of the two transistors. The second resistor employs the characteristic that a transistor operated in weak inversion region acts like a bipolar junction transistor to generate a positive temperature coefficient current. The negative temperature coefficient current generator generates a negative temperature coefficient current in response to a negative temperature coefficient voltage drop on a third resistor. The positive temperature coefficient current and the negative temperature coefficient current flow through the first resistor together, thus producing a stable reference voltage.
    Type: Grant
    Filed: September 6, 2006
    Date of Patent: November 27, 2007
    Assignee: Faraday Technology Corp.
    Inventors: Uei-Shan Uang, Kuen-Shan Chang, Mei-Show Chen
  • Patent number: 7282901
    Abstract: A circuit of the invention comprises a low voltage PTAT source. Current generators (t1, t2) are controlled so that their output currents I1 and I2, respectively, have temperature properties of the quotient VPTAT/R. The current I1 is conducted to a first terminal (X) on a first connection of a composition of series connected resistors (Ra, Rb), a second connection thereof being grounded. A transistor (T) is diodelike forward connected between the first terminal (X) and the ground. The current I2 is conducted to a second terminal (Y), preferably being at the same time a common connection (Z) of the resistors (Ra, Rb). Reference voltage Vr is tapped from the connection (Z). Said resistors (Ra, Rb) are manufactured in the n?-well technology in the same way as the resistor (R), with the resistance of which the mentioned quotient is generated.
    Type: Grant
    Filed: July 9, 2003
    Date of Patent: October 16, 2007
    Inventor: Anton Pletersek
  • Patent number: 7274174
    Abstract: In a voltage regulator including an inductor current flowing through a sense element with a first temperature coefficient, and a current sense circuit for generating a current sense signal related to the first temperature coefficient by sensing the inductor current from the sense element, a temperature compensation device and method determines a second temperature coefficient according to the first temperature coefficient and temperature variation, and produces a compensation signal with the second temperature coefficient to compensate variations in the current sense signal caused by the first temperature coefficient.
    Type: Grant
    Filed: September 20, 2005
    Date of Patent: September 25, 2007
    Assignee: Richtek Technology Corp.
    Inventors: Hung-I Wang, Jiun-Chiang Chen
  • Patent number: 7253597
    Abstract: A curvature corrected bandgap reference circuit comprises a first bipolar transistor having a base-emitter voltage Vbe1 and operated such that it has a constant operating current, and a second bipolar transistor having a base-emitter voltage Vbe2 and operated such that it has an operating current consisting of an approximately temperature proportional component and a non-linear component. The circuit is arranged such that the ratio of the current densities in the two transistors varies with temperature, such that the difference voltage (?Vbe=Vbe1?Vbe2) includes a residual component which approximately compensates bandgap curvature error.
    Type: Grant
    Filed: February 23, 2005
    Date of Patent: August 7, 2007
    Assignee: Analog Devices, Inc.
    Inventor: A. Paul Brokaw
  • Patent number: 7208930
    Abstract: A bandgap voltage regulator is arranged such that, when a desired output voltage is present between its output and common terminals, current densities in a pair of bipolar transistors having unequal emitter areas are maintained in a fixed ratio. The difference in the transistors' base-emitter voltages is across a resistor, which thus conducts a PTAT current. The regulator also generates a CTAT current, and both the PTAT and CTAT currents are made to flow in another resistor, with the resulting voltages added by superposition. The regulator's resistors are sized such that Vout is an integral or fractional multiple of Vbg, where Vbg is the bandgap voltage for the fabrication process used to make the regulator's transistors, such that Vout is temperature invariant, to a first order. The resistors are preferably realized using unit resistors having a predetermined resistance, or series and/or parallel combinations of unit resistors.
    Type: Grant
    Filed: January 10, 2005
    Date of Patent: April 24, 2007
    Assignee: Analog Devices, Inc.
    Inventors: Chau C. Tran, A. Paul Brokaw
  • Patent number: 7197419
    Abstract: A system and method are provided for monitoring temperature within a specified integrated circuit. Usefully, the system comprises at least one oscillator device proximate to the integrated circuit for generating signal pulses at a frequency that varies as a function of the temperature adjacent to the oscillator device. The system further comprises a control unit for establishing sample acquisition periods of invariant time duration based on an time invariant reference clock. A sampling component is coupled to count the number of pulses generated by the oscillator device during each of a succession of the time invariant sample acquisition periods, and a threshold component responsive to the respective count values for the succession of sample acquisition periods provides notice when at least some of the count values have a value associated with a prespecified excessive temperature level.
    Type: Grant
    Filed: February 3, 2005
    Date of Patent: March 27, 2007
    Assignee: International Business Machines Corporation
    Inventors: Michael Stephen Floyd, Asher Shlomo Lazarus, Brian Chan Monwai
  • Patent number: 7193402
    Abstract: A bandgap reference voltage circuit is provided, in which an additional resistor as well as a transistor is utilized to prevent the source-drain voltage of a metal oxide semiconductor field effect transistor electrically connected to an output terminal of the bandgap reference voltage circuit from falling into the triode region. Through the provided bandgap reference voltage circuit, the temperature compensation effect is able to be normally executed, so as to supply a stable bandgap reference voltage.
    Type: Grant
    Filed: August 12, 2005
    Date of Patent: March 20, 2007
    Assignee: Analog Integrations Corporation
    Inventors: Jian-Lung Lee, Tsung-Hsiu Wu
  • Patent number: 7166994
    Abstract: A bandgap reference circuit. In the bandgap reference circuit, a current generator includes a first bipolar junction transistor (BJT) and generates a first positive temperature coefficient current thereby producing a negative temperature coefficient voltage between a base terminal and an emitter terminal of the first bipolar junction transistor. A single-end gain amplifier includes a positive input terminal coupled to the emitter terminal of first the bipolar junction transistor. A first resistor is coupled between the output terminal of the single-end gain amplifier and an output terminal of the bandgap reference circuit to generate a first current. A current-to-voltage converter is coupled to the first resistor to convert the first positive temperature coefficient current and the first current to a bandgap voltage.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: January 23, 2007
    Assignee: Faraday Technology Corp.
    Inventors: Chao-Chi Lee, Wen-Cheng Yen
  • Patent number: 7164259
    Abstract: An apparatus and method for producing an output reference voltage is provided. A voltage divider is configured to provide the output reference voltage from a bandgap reference voltage. The bandgap reference voltage is applied across a biased portion of the voltage divider. Additionally, a second-order temperature coefficient (TC) of the impedance of a controllable portion of the voltage divider is adjusted in response to a second-order trim signal. The first and zeroth order TCs of the controllable portion of the voltage divider are substantially independent of the second-order trim signal. In one embodiment, the controllable portion includes a resistor digital-to-analog converter (DAC) that is responsive to the second-order trim signal. The resistor DAC includes at least two different types of resistors. The second-order TCs of the two different types of resistors are substantially different.
    Type: Grant
    Filed: March 16, 2004
    Date of Patent: January 16, 2007
    Assignee: National Semiconductor Corporation
    Inventors: David James Megaw, Paul Ranucci
  • Patent number: 7161340
    Abstract: A reference voltage generator includes a plurality of signal generators for producing N+1 signals respectively corresponding to N+1 temperature dependent characteristics, a combining module coupled to the signal generators for combining the N+1 signals to form a combined signal, and a signal to voltage converter coupled to the combining module for generating a compensated reference voltage according to the combined signal. The signal generators include N+1 devices having p-n junctions and each device has a specific temperature dependent characteristic corresponding to the voltage across a p-n junction, such as the base-emitter voltage of a transistor. By scaling the N+1 signals, a reference voltage at a predetermined value is generated and has Nth order temperature compensation.
    Type: Grant
    Filed: July 12, 2004
    Date of Patent: January 9, 2007
    Assignee: Realtek Semiconductor Corp.
    Inventor: Yung-Ming Chiu
  • Patent number: 7157893
    Abstract: There is provided a reference voltage generator that generates a constant reference voltage regardless of a change in temperature. The reference voltage generator includes a temperature-compensated current generating part for reducing a supply current provided to an output terminal in response to an increase of temperature, and a diode for receiving the supply current through the output terminal.
    Type: Grant
    Filed: June 29, 2004
    Date of Patent: January 2, 2007
    Assignee: Hynix Semiconductor Inc.
    Inventor: Jong-Chern Lee
  • Patent number: 7126316
    Abstract: A voltage regulation circuit. The voltage regulator includes an input stage, a reference voltage circuit, a gain stage, and an output stage. The reference voltage circuit is coupled to one input of the input stage, and the output stage is coupled to another input of the input stage. The gain stage includes a buffer device coupled to the output of the input stage and a drive circuit coupled to the output stage. The buffer device is operable to provide isolation between the input stage and the drive circuit. The drive circuit may include a first transistor coupled to the output stage, a base current translation circuit, and a current divide circuit coupled to the first transistor and to said base current translation circuit. The input stage may be biased with a substantially constant bias current, such that output dependent current loading effects are avoided.
    Type: Grant
    Filed: February 9, 2004
    Date of Patent: October 24, 2006
    Assignee: National Semiconductor Corporation
    Inventor: Ronald Neal Dow
  • Patent number: 7122997
    Abstract: A temperature compensated low voltage reference circuit can be realized with a reduced operating voltage overhead. This is accomplished in several ways including minimizing drain voltage variation at the drains of two inter-connected transistors and implementing a current conveyer in order to adjust the temperature coefficient of an output current or voltage. Various combinations of voltage minimization and temperature coefficient adjustments may be used to design a reference circuit to a circuit designer's preference. A temperature compensated current source may also be created. The temperature compensated current source may be used to provide a wide range of output voltages. All of the reference circuits may be constructed with various types of transistors including DTMOS transistors.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: October 17, 2006
    Assignee: Honeywell International Inc.
    Inventor: Paul M. Werking
  • Patent number: 7122998
    Abstract: A system and method is disclosed for providing a bandgap reference voltage generator that can successfully operate with a low operating voltage. Three current sources are controlled to provide same amount of current through three paths. The first current source is used to enable a first negative temperature coefficient module, while the second and third current sources are used to enable a first positive temperature coefficient module. The three current sources together are used to enable a reference voltage output module, which is connected to a current summing module for producing a bandgap reference voltage independent of temperature variations.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: October 17, 2006
    Assignee: Taiwan Semiconductor Manufacturing Company
    Inventor: Chung-Hui Chen
  • Patent number: 7109697
    Abstract: An operational amplifier having temperature-compensated offset correction. The amplifier includes an operational amplifier circuit, that has a first input field effect transistor (FET) having a gate connected to receive a first input signal, and a second input FET having a gate connected to receive a second input signal, the first and the second input FETs being connected together to receive a first bias current, and also being connected to respective sides of a first current mirror. A correction amplifier circuit is also provided, that has a first correction FET having a gate, and a second correction FET having a gate, the first and the second correction FETs being connected together to receive a second bias current, and also being connected to respective sides of a second current mirror.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: September 19, 2006
    Assignee: Texas Instruments Incorporated
    Inventors: Amer Hani Atrash, Shanmuganand Chellamuthu
  • Patent number: 7098720
    Abstract: A thermal shutdown circuit board integrated circuit device. The thermal shutdown circuit includes a current source for receiving a current bias and generating an output current in accordance therewith. The current source is configured to produce the output current in a manner proportional to absolute temperature. A current mirror is coupled to the current source. The current mirror is configured to mirror the output current from the current source and is configured to have a high output impedance. A thermal shutdown transistor is coupled to control one output of the current mirror. The thermal shutdown transistor is also coupled to receive the output current and shutdown the output current at a temperature threshold in a manner dependent on shutdown circuit operating temperature.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: August 29, 2006
    Assignee: National Semiconductor Corporation
    Inventor: Ronald Neal Dow
  • Patent number: 7091713
    Abstract: A method and circuit are shown for generating a higher order compensated bandgap voltage is disclosed, in which a first order compensated bandgap voltage and a linearly temperature dependent voltage are generated. Thereafter, a difference between the linearly temperature dependent voltage and the first order compensated bandgap voltage is generated. The resulting difference voltage is squared, and finally the squared voltage is added to the first order compensated bandgap voltage, resulting in a higher order compensated bandgap voltage. There is also disclosed a higher order temperature compensated bandgap circuit.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: August 15, 2006
    Assignee: Integration Associates Inc.
    Inventors: János Erdélyi, András Vince Horváth
  • Patent number: 7088357
    Abstract: A power circuit supplies a plurality of voltages to a display-device-driving circuit for time-division-driving a display device. Each of the plurality of voltages are output via a constant-voltage circuit constituted by a regulator for dividing a voltage supplied from a power source and keeping the divided voltages at a certain voltage level, whereby a stable power source consuming a small amount of power when supplying power to a driving circuit as a power source for a display device to be time-division-driven can be obtained.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: August 8, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventor: Ritsuo Kashiyama
  • Patent number: 7075281
    Abstract: A current source for providing a current proportional to absolute temperature (a PTAT current) with high precision is implemented using only one off-chip component. The current source utilizes a bandgap voltage, a voltage related to a current proportional to absolute temperature and a constant current to bias a pair of voltage controlled resistive devices. In operation, a known resistance is derived by applying a constant voltage across and a constant current through a first voltage controlled resistive device. A control voltage for maintaining the constant current through the first voltage controlled resistive device is applied to control the second voltage controlled resistive device, thereby generating the highly precise PTAT current at the second voltage controlled resistive device. In one embodiment, the current source uses only one off-chip resistor in a constant current source for generating the constant current.
    Type: Grant
    Filed: August 15, 2005
    Date of Patent: July 11, 2006
    Assignee: Micrel, Inc.
    Inventor: Fred-Johan Pettersen
  • Patent number: 7071673
    Abstract: Several methods to obtain process insensitive base-emitter forward voltage of a transistor are described. The main concept is to recognize that the transistor current gain is the parameter that affects this voltage the most with normal process variations. The use of transistor driven with known base current removes this error. In alternative, a method for compensating the base-emitter forward voltage variations is described. This is applicable to analog integrated circuits that utilize the base-emitter forward voltage of a transistor and in particular in applications that make use of either accurate voltage references, thermal sensing elements, solid state thermostats and very common thermal shutdown protection circuits.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: July 4, 2006
    Assignee: ACU Technology Semiconductor Inc.
    Inventors: Paolo Menegoli, Carl K. Sawtell
  • Patent number: 7068024
    Abstract: Disclosed herein is a voltage regulator, and related method, for regulating a boost voltage generated by a boost circuit. In one embodiment, the voltage regulator includes a regulated voltage input operable to receive a regulated voltage derived from the boost voltage, a reference voltage input operable to receive a constant reference voltage, and an output node operable to provide a feedback signal to the boost circuit for controlling the generated boost voltage. In addition, the voltage regulator includes at least one transistor coupled to the regulated voltage input, the reference voltage input, and the output node, and operable to produce the feedback signal based on a comparison of the regulated voltage to the reference voltage.
    Type: Grant
    Filed: December 30, 2004
    Date of Patent: June 27, 2006
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventor: Chien-Hua Huang
  • Patent number: 6975314
    Abstract: There is provided a power circuit for a display-device-driving circuit for supplying a plurality of voltages to a driving circuit for time-division-driving a display device, wherein each of the plurality of voltages are output via a constant-voltage circuit constituted by a regulator for dividing a voltage supplied from a power source and keeping divided voltages at a certain voltage level, whereby a stable power source consuming a small power to a driving circuit as a power source for a display device to be time-division-driven can be obtained.
    Type: Grant
    Filed: January 30, 2003
    Date of Patent: December 13, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventor: Ritsuo Kashiyama
  • Patent number: 6958597
    Abstract: Voltage generating apparatus includes a positive temperature coefficient current generating module, a negative temperature coefficient current generating module, a fine-tune current module and a voltage output module. The function of the positive temperature coefficient current generating module and the negative temperature coefficient current generating module, which take advantage of characteristics of MOS devices operated in the sub-threshold region, is to generate a stable current of positive temperature coefficient and a stable current of negative temperature coefficient, respectively. The current fine-tune module increases or decreases output current of the negative temperature coefficient current generating module. The voltage output module sums two output currents of the positive temperature coefficient current generating module and the negative temperature coefficient current generating module and transforms the total current into output voltage that is stable under temperature and process variation.
    Type: Grant
    Filed: May 7, 2004
    Date of Patent: October 25, 2005
    Assignee: eMemory Technology Inc.
    Inventors: Hong-chin Lin, Po-Hsuan Huang, Chien-Hung Ho
  • Patent number: 6956397
    Abstract: The present invention provides a refresh clock generator which optimally controls a period of a refresh clock signal according to temperature variation and outputs the refresh clock signal. The refresh clock generator includes a bias voltage generating unit for generating first and second bias voltages in response to a temperature variation and a clock generator for generating a refresh clock signal having a frequency which is controlled or adjusted based on the first and second bias voltages, wherein the first bias voltage is varied in proportion to the temperature variation; the second bias voltage is varied in inverse proportion to the temperature variation; and the frequency of the refresh clock signal is varied in proportion to the temperature variation.
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: October 18, 2005
    Assignee: Coremagic Inc.
    Inventors: Jung-Don Lim, Mi-Kyeong Yun
  • Patent number: 6937001
    Abstract: A circuit for generating a reference voltage includes a bandgap reference circuit that exhibits low temperature dependency of the output reference voltage. Since temperature dependencies of resistances thereof are appropriately controlled so that the temperature dependency of a load current flowing through divisional resistances is eliminated, it is possible to prevent the linearity of temperature dependency of the forward direction voltages of diodes from degrading. Accordingly, the temperature dependency of output is reduced.
    Type: Grant
    Filed: February 26, 2003
    Date of Patent: August 30, 2005
    Assignee: Ricoh Company, Ltd.
    Inventor: Yoshinori Ueda
  • Patent number: 6922045
    Abstract: Disclosed is current driver circuit comprising a bandgap reference circuit for generating a fixed current and a current proportional to absolute temperature (PTAT), a temperature compensator for combining the fixed and PTAT currents and forming first and second temperature compensated currents, a current control circuit for modifying said first and second temperature compensated currents in response to signals representing the characteristics of a load device and a driver circuit for amplifying and supplying a selected one of said first and second temperature compensated currents to said load device. Also disclosed is a method of supplying a precisely controlled current by generating a constant current and a current proportional to absolute temperature (PTAT), combining these two currents and providing temperature compensated currents, modifying the temperature compensated currents with a programmed reference signal and supplying a precisely controlled current to a load device.
    Type: Grant
    Filed: February 13, 2003
    Date of Patent: July 26, 2005
    Assignee: Primarion, Inc.
    Inventors: David W. Self, C. Phillip McClay
  • Patent number: 6906902
    Abstract: A semiconductor integrated circuit comprises a transistor which has a first electrode, a second electrode and a third electrode, said transistor conducting a current of a first power source from the second electrode to the third electrode by a power supplied to the first electrode; a driver to supply said first electrode with power for driving said transistor; a reference voltage circuit to generate a reference voltage which is variable in response to temperature of said transistor, said reference voltage being used as the reference for comparison; a comparative voltage circuit to generate a comparative voltage which is variable in response to a current flowing from said second electrode to said third electrode, said comparative voltage being compared with said reference voltage; and a controller which receives said reference voltage and said comparative voltage and which supplies a control signal to said driver, said control signal being based on a result of the comparison between the comparative voltage and
    Type: Grant
    Filed: October 4, 2002
    Date of Patent: June 14, 2005
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kiyomi Watanabe
  • Patent number: 6891358
    Abstract: A voltage reference circuit is provided which includes PTAT and CTAT generating components. The CTAT components are provided in a feedback configuration about an operational amplifier and are combined with PTAT generating components which are coupled to the inputs of the amplifier. The combination of the CTAT and PTAT components is effected in a manner which provides for a temperature curvature correction of the output voltage of the circuit.
    Type: Grant
    Filed: December 27, 2002
    Date of Patent: May 10, 2005
    Assignee: Analog Devices, Inc.
    Inventor: Stefan Marinca
  • Patent number: 6873143
    Abstract: Provided is an on-chip reference current generating circuit for generating a reference voltage that can be digitally calibrated and is substantially not affected by changes in temperature and/or supply voltage. The on-chip reference current generating circuit includes a summing circuit for receiving a first current having a negative temperature coefficient and a second current having a positive temperature coefficient, and outputting a third current based upon, is a sum of, the first and second currents; and a digital calibration circuit for calibrating the third current to be the reference current in response to a digital control signal. Using the on-chip reference current generating circuit, it is possible to precisely and digitally calibrate an offset between currents due to a change in temperature and/or supply voltage.
    Type: Grant
    Filed: February 20, 2003
    Date of Patent: March 29, 2005
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyoung-ho Moon, Seung-hoon Lee, Jong-bum Park, Hee-seuk Yang
  • Patent number: 6870351
    Abstract: A voltage regulator circuit includes an output stage circuit which operates either in a normal operation state in which a regulator output voltage stabilized in accordance with an input control voltage is supplied from a regulator output terminal to an external load circuit or in an overcurrent protection state in which a regulator output current supplied from the regulator output terminal to the external load circuit is limited up to a predetermined level. The voltage regulator circuit further includes a first control circuit which generates the control voltage in accordance with the regulator output voltage and outputs the control voltage to the output stage circuit, and a second control circuit which monitors a state of the output stage circuit and switches the output stage circuit between the normal operation state and the overcurrent protection state in accordance with the monitored state of the output stage circuit.
    Type: Grant
    Filed: March 31, 2003
    Date of Patent: March 22, 2005
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Naoaki Sugimura
  • Patent number: 6819093
    Abstract: The multiplication circuitry of the present invention operates to generate multiple monolithic electrical currents, all referenced to a single external resistor. A first current referenced to a first monolithic resistor, a second current referenced to a second monolithic resistor, and a third current referenced to an external resistor are used to generate an output current, which is also referenced to the external resistor. The present invention accurately generates two currents each being referenced to the single external resistor, while simultaneously minimizing the number of external connections and overall cost of producing the circuitry.
    Type: Grant
    Filed: May 5, 2003
    Date of Patent: November 16, 2004
    Assignee: RF Micro Devices, Inc.
    Inventor: Michael R. Kay
  • Patent number: 6812683
    Abstract: A drain-source voltage regulator in a VPTAT generator operates with a lower minimum Vdd and provides a regulated current-mirror voltage. The minimum Vdd can be expressed as Vdd_min=Vdsat_cs+Vdsat_amp+VGS_pmir. Regulation of the current-mirror voltage is achieved by using a common-gate configuration to generate a low-voltage reference. The low-voltage reference is generated inside a regulated feedback loop that includes the VPTAT generator. The current-mirror voltage, which is outside the loop, is indirectly regulated. The current-mirror voltage can be regulated within a voltage range that spans from tens of millivolts to hundreds of millivolts.
    Type: Grant
    Filed: April 23, 2003
    Date of Patent: November 2, 2004
    Assignee: National Semiconductor Corporation
    Inventor: Perry Scott Lorenz
  • Patent number: 6791308
    Abstract: The present invention provides a temperature-compensating reference voltage generator, including a temperature-compensating voltage divider, or variable voltage generator, for dividing an input reference voltage in order to generate a temperature-compensated output voltage. Preferably included, are a first differential amplifier for amplifying a voltage difference between a first reference voltage and a first feedback voltage in order to output an internal reference voltage, a first voltage divider for generating and outputting a first feedback voltage in response to the temperature-compensated voltage, the first voltage divider further including, two resistive elements for controlling a magnitude of reference voltage.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: September 14, 2004
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jae-yoon Shim
  • Patent number: 6765372
    Abstract: A current-sensing and correction circuit having programmable temperature compensation circuitry that is incorporated into a pulse width modulation controller of a buck mode DC—DC converter. The front end of the controller contains a sense amplifier, having an input coupled via a current feedback resistor to a common output node of the converter. The impedance of a MOSFET, the current through which is sampled by a sample and hold circuit is controlled by the sense amplifier unit. A sensed current correction circuit is coupled between the sample and hold circuit and the controller, and is operative to supply to the controller a correction current having a deterministic temperature-compensating relationship to the sensed current. The ratio of correction current to sensed current equals a value of one at a predetermined temperature, and has other values at temperatures other than at that temperature.
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: July 20, 2004
    Assignee: Intersil Americas Inc.
    Inventor: Robert Haynes Isham
  • Patent number: 6737849
    Abstract: A bandgap circuit for producing a constant current having a controllable temperature coefficient. A current mirror supplies first and second substantially identical currents to first and second bipolar transistors. A first resistor is connected across the emitters of the bipolar transistors. A second resistor connects one to the bipolar emitters to a common terminal where the current source currents are recombined and supplied to a common terminal of a power supply. The band gap voltage produced at the common base connections of the bipolar transistors have a voltage temperature coefficient which is controlled by the values of the resistors. A current source is coupled to receive the bandgap voltage and produces a current having a temperature coefficient corresponding to the voltage temperature coefficient of the bandgap voltage.
    Type: Grant
    Filed: June 19, 2002
    Date of Patent: May 18, 2004
    Assignee: International Business Machines Corporation
    Inventors: Aria Eshraghi, Xiaodong Wang
  • Patent number: 6724196
    Abstract: A temperature controlled high voltage regulator for automatically adjusting the high voltage applied to a radiation detector is described. The regulator is a solid state device that is independent of the attached radiation detector, enabling the regulator to be used by various models of radiation detectors, such as gas flow proportional radiation detectors.
    Type: Grant
    Filed: August 28, 2002
    Date of Patent: April 20, 2004
    Assignee: The United States of America as represented by the Department of Energy
    Inventors: Peter J. Chiaro, Jr., Gerald K. Schulze
  • Patent number: 6650097
    Abstract: To provide a voltage regulator with high safety in which its characteristics do not deteriorate and the regulator is not destroyed even if it is used with a large loss, for example, it is erroneously used in excess of an allowable loss. The voltage regulator of the present invention is provided with a loss detecting circuit that functions so as to lower an output voltage when a loss increases. When the loss detecting circuit is activated, the output voltage falls and an output current decreases, whereby the loss can be reduced.
    Type: Grant
    Filed: June 6, 2002
    Date of Patent: November 18, 2003
    Assignee: Seiko Instruments Inc.
    Inventor: Atsushi Sakurai
  • Patent number: 6642699
    Abstract: A bandgap reference that generates a temperature stable DC voltage by using a corrective current. The corrective current is generated by a series of differential pairs that are controlled by both positive temperature shift gate voltage on one transistor, as well as a negative temperature shift gate voltage on the other transistor. As temperature changes and crosses the crossing point at which the current is split evenly through both transistors, the current change is more abrupt. The crossing points of each of the differential pairs may be appropriately selected so as to generate a high resolution corrective current. The various current contributions are summed to form the total corrective current, which tends to be quite accurate due to the abrupt crossing points. The corrective current is then fed back into the circuit so as to compensate for much of the temperature error.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: November 4, 2003
    Assignee: AMI Semiconductor, Inc.
    Inventor: Bernard Robert Gregoire, Jr.
  • Patent number: 6623244
    Abstract: A scroll compressor is provided with a thermostat selectively closing when predetermined temperatures are reached to deliver current to a heater associated with a motor protector switch. The thermostat is able to more quickly close in response to undesirable conditions in the compressor, than would be the case with the motor protector switch typically found at the motor. The circuit associated with the motor protector switch preferably includes at least two heaters, with the normal heater associated with the power lines leading to the motor performing its normal function. The thermostat is preferably associated with an auxiliary heater. In another feature, a heater is preferably formed with a thick film technology directly onto an insulator element within the motor protector body.
    Type: Grant
    Filed: November 1, 2001
    Date of Patent: September 23, 2003
    Assignee: Scroll Technologies
    Inventor: Jason Hugenroth
  • Patent number: 6611248
    Abstract: Each of stages RS(1), RS(2), . . . of a shift register is constituted by six TFTs. A ratio of a channel width and a channel length (W/L) of each of these TFTs 1 to 6 is set in accordance with a transistor characteristic of each TFT in such a manner that the shift register normally operates for a long time even at a high temperature.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: August 26, 2003
    Assignee: Casio Computer Co., Ltd.
    Inventors: Minoru Kanbara, Kazuhiro Sasaki, Katsuhiko Morosawa
  • Patent number: 6600302
    Abstract: A voltage stabilization circuit includes a band gap reference circuit to generate a stable output voltage that is temperature-independent, and a folded cascode feedback circuit to generate a feedback potential that is applied to stabilize the band gap reference circuit. The folded cascode feedback circuit is implemented with current mirror circuits.
    Type: Grant
    Filed: October 31, 2001
    Date of Patent: July 29, 2003
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Adam L Ghozeil, Jeffery S Beck
  • Patent number: 6597588
    Abstract: An insulating-type switching electric power source device has an input voltage Vin of a primary side that is converted at an input/output ratio determined by switching operations of a switching device, and then is output. Voltage subjected to rectifying and smoothing by a primary-side rectification smoothing circuit is used as detecting signals of the output voltage, to control the time ratio of the switching device. A load regulation correcting circuit outputs load regulation correcting signals correlated with the amount of output current. A temperature compensating circuit corrects the load regulation correcting signals according to the ambient temperature. The load regulation correcting signals correct the output voltage detecting signals according to the fluctuations of the output voltage according to fluctuations in the output current and fluctuations in the ambient temperature.
    Type: Grant
    Filed: August 6, 2002
    Date of Patent: July 22, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Tadahiko Matsumoto
  • Patent number: 6566849
    Abstract: A non-linear temperature compensation circuit (10) is provided for generating at least dual-slope characteristics responsive to changes in operating temperature of the compensation circuit. The compensation circuit includes a temperature dependent current generator circuit (11) for generating at least one output (I4) substantially proportional to changes in the temperature of the circuit, a current-based dual-slope drift generator (12) for generating a current proportional to absolute temperature, and a summing means (14) for summing both current outputs and generating a compensation drift voltage. The temperature dependent current generator includes a sub-circuit having a first current generator that generates a current (I2) that is relatively independent of temperature, and a second current generator that generates a second current (I3) that decreases with increases in temperature.
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: May 20, 2003
    Assignee: Delphi Technologies, Inc.
    Inventors: Abhijeet V. Chavan, Gregory J. Manlove
  • Patent number: 6559661
    Abstract: A circuit arrangement is described for compensating temperature non-linearity of the characteristics of piezoresistive, metallic or polycrystalline resistors (bridge resistors) connected in a bridge circuit, the non-linearities being caused by non-linearities of the resistors, in particular due to the physical quantities affecting the bridge circuit (temperature, pressure, bimetal effects, non-linear membrane stresses), and the resistors being composed of partial resistors having different temperature coefficients, with each of the partial resistors having a certain linear and non-linear temperature response. The partial resistors of each bridge resistor are selected on the basis of their known linear and non-linear temperature characteristics so that an asymmetric layout of the bridge circuit is obtained and a non-linear variation of a bridge output voltage of the circuit arrangement can be essentially compensated.
    Type: Grant
    Filed: July 18, 2001
    Date of Patent: May 6, 2003
    Assignee: Robert Bosch GmbH
    Inventors: Joerg Muchow, Joachim Horn, Oliver Schatz
  • Patent number: 6552518
    Abstract: A current generator with thermal protection has an input terminal and an output terminal. The current generator includes a voltage generator, first and second controlled switches, a temperature sensor, and a control circuit. The first controlled switch has a control terminal applied to the voltage generator, a first terminal connected to the input terminal, and a second terminal connected to a resistance. The second controlled switch has a control terminal coupled to the voltage generator, a first terminal connected to the resistance, and a second terminal connected to the output terminal. The temperature sensor of the current generator measures the temperature of the generator, and the control circuit controls the second controlled switch so as to open the second controlled switch when the temperature of the current generator overcomes a preset temperature.
    Type: Grant
    Filed: June 7, 2001
    Date of Patent: April 22, 2003
    Assignee: STMicroelectronics S.r.l.
    Inventors: Natale Aiello, Francesco Macina
  • Patent number: 6548994
    Abstract: A reference voltage generator capable of stably generating a reference voltage irrespective of temperature variations is provided. The reference voltage generator includes a voltage bias unit having a plurality of resistors and a first group of transistors serially connected between a power supply voltage node and a ground voltage node, a reference voltage node connected to one of the plurality of resistors or transistors to produce a preliminary reference voltage; a voltage controller connected between the preliminary reference voltage node and the ground voltage node; a temperature compensator having a second group of transistors serially connected between the preliminary reference voltage node and a reference voltage node to produce a reference voltage; and a voltage compensator having a third group of transistors serially connected between the reference voltage node and the ground voltage node for controlling the reference voltage.
    Type: Grant
    Filed: November 14, 2001
    Date of Patent: April 15, 2003
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Seong-jin Jang
  • Patent number: 6541949
    Abstract: A current source with low temperature dependence includes a reference current source and a current mirror for copying the reference source current to at least one output branch. The reference current source and the current mirror may have opposite coefficients of temperature dependence and the current mirror may be a weighted mirror. The present invention is particularly applicable to the manufacture of integrated circuits.
    Type: Grant
    Filed: May 24, 2001
    Date of Patent: April 1, 2003
    Assignee: STMicroelectronics S.A.
    Inventor: Philippe Sirito-Olivier
  • Patent number: 6528978
    Abstract: A reference voltage generating circuit of the present invention includes a start-up circuit connected between a power supply voltage and a ground voltage for generating a start-up voltage, a bias current generating circuit connected between the power supply voltage and the ground voltage for generating a bias current in response to the start-up voltage, the bias current increasing in response to an increase in temperature, a current generator connected between the power supply voltage and a reference voltage generating terminal for generating a mirrored current of the bias current, and a load connected between the reference voltage generating terminal and the ground voltage for generating a reference voltage that increases in response to any increase in temperature regardless of variations in the level of the power supply voltage. Accordingly, the level of reference voltage generated increases in response to increases in temperature regardless of variations in the level of the power supply voltage.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: March 4, 2003
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Kyu-Nam Lim