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| Number | Title | Issue Date |
| 7429719 | Self-regulating heater with a semiconductor heating element and method of heating A self-regulating heater including a semiconductor for converting electrical energy to heat. A temperature sensitive element is used to bias the semiconductor as a function of temperature. The heating element has an advantage that its maximum temperature is limited ... | 09/30/2008 |
| 7411380 | Non-linearity compensation circuit and bandgap reference circuit using the same A non-linearity compensation circuit and a bandgap reference circuit using the same for compensating non-linear effects of a reference voltage are provided. In the non-linearity compensation circuit, the reference voltage is transformed into a temperature independen... | 08/12/2008 |
| 7405547 | Stabilized DC power supply circuit having a current limiting circuit and a correction circuit A stabilized DC power supply circuit of the present invention includes an output current limiting circuit for limiting an output current of an output transistor, and a correction circuit for correcting variation of restriction in the output current caused by variati... | 07/29/2008 |
| 7345460 | Thermal compensation method for CMOS digital-integrated circuits using temperature-adaptive digital DC/DC converter A device and method of providing thermal compensation for integrated circuits, e.g., complementary metal-oxide semiconductor integrated circuits (“IC”) is described. The device is an IC (e.g., digital, analog, and mixed-signal circuits) with a digital voltage co... | 03/18/2008 |
| 7327129 | Current sense circuit and method for a DC-to-DC converter 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 f... | 02/05/2008 |
| 7315461 | Power supply device An object of this power supply device is to enable an overheat protection level and an overvoltage protection level to be set accurately. This power supply device includes a Schottky barrier diode (D52), which is placed as a temperature detection element at a... | 01/01/2008 |
| 7301321 | Voltage reference circuit 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 operate... | 11/27/2007 |
| 7282901 | Temperature independent low reference voltage source 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 ... | 10/16/2007 |
| 7274174 | Temperature compensation device and method for a voltage regulator 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 ... | 09/25/2007 |
| 7253597 | Curvature corrected bandgap reference circuit and method 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 | 08/07/2007 |
| 7208930 | Bandgap voltage regulator 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 th... | 04/24/2007 |
| 7197419 | System and method for thermal monitoring of IC using sampling periods of invariant duration 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... | 03/27/2007 |
| 7193402 | Bandgap reference voltage circuit 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 bandga... | 03/20/2007 |
| 7166994 | Bandgap reference circuits 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 ... | 01/23/2007 |
| 7164259 | Apparatus and method for calibrating a bandgap reference voltage 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 d... | 01/16/2007 |
| 7161340 | Method and apparatus for generating N-order compensated temperature independent reference voltage 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 com... | 01/09/2007 |
| 7157893 | Temperature independent reference voltage generator 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... | 01/02/2007 |
| 7126316 | Difference amplifier for regulating voltage 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... | 10/24/2006 |
| 7122998 | Current summing low-voltage band gap reference circuit 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 u... | 10/17/2006 |
| 7122997 | Temperature compensated low voltage reference circuit 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 c... | 10/17/2006 |
| 7113025 | Low-voltage bandgap voltage reference circuit A bandgap reference voltage generating circuit includes a proportional to absolute temperature (PTAT) voltage generating means generating a PTAT voltage. A complementary to absolute temperature (CTAT) voltage generating means generates a CTAT voltage. A temperature ... | 09/26/2006 |
| 7109697 | Temperature-independent amplifier offset trim circuit 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 h... | 09/19/2006 |
| 7098720 | High impedance thermal shutdown circuit 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 i... | 08/29/2006 |
| 7091713 | Method and circuit for generating a higher order compensated bandgap voltage 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 temper... | 08/15/2006 |
| 7088357 | Power circuit for display driver, display device, and camera 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 fr... | 08/08/2006 |
| 7075281 | Precision PTAT current source using only one external resistor 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 absolut... | 07/11/2006 |
| 7071673 | Process insensitive voltage reference 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... | 07/04/2006 |
| 7068024 | Voltage regulator having positive temperature coefficient for self-compensation and related method of regulating voltage 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 volta... | 06/27/2006 |
| 6975314 | Power circuit for display driver, display device, and camera 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 constitu... | 12/13/2005 |
| 6958597 | Voltage generating apparatus with a fine-tune current module 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 coeffic... | 10/25/2005 |
| 6956397 | Temperature adaptive refresh clock generator for refresh operation 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 gene... | 10/18/2005 |
| 6937001 | Circuit for generating a reference voltage having low temperature dependency 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 dep... | 08/30/2005 |
| 6922045 | Current driver and method of precisely controlling output current 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 temp... | 07/26/2005 |
| 6906902 | Semiconductor integrated circuit 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 ... | 06/14/2005 |
| 6891358 | Bandgap voltage reference circuit with high power supply rejection ratio (PSRR) and curvature correction 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 o... | 05/10/2005 |
| 6873143 | On-chip reference current and voltage generating circuits 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 includ... | 03/29/2005 |
| 6870351 | Voltage regulator circuit and integrated circuit device including the same 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... | 03/22/2005 |
| 6819093 | Generating multiple currents from one reference resistor 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 monol... | 11/16/2004 |
| 6812683 | Regulation of the drain-source voltage of the current-source in a thermal voltage (VPTAT) generator 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 ... | 11/02/2004 |
| 6791308 | Internal power supply for an integrated circuit having a temperature compensated reference voltage generator 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 ... | 09/14/2004 |
