Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7619402 | Low dropout voltage regulator with programmable on-chip output voltage for mixed signal embedded applications 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 chan... | 11/17/2009 |
| 7495427 | AC electrical power dividing circuit An AC electrical power dividing circuit includes a hot line, a neutral line, a ground line, two output ports, a first voltage-dividing module, a second voltage-dividing module, a first sampling resistor, and a second sampling resistor. The hot line is coupled to the... | 02/24/2009 |
| 7358747 | Rotary potentiometer with selectable operating section A transducer in the form of a potentiometer provides an output signal indicative of a position of a component. The potentiometer comprises a body, a member moveable relative to the body and having an end portion for coupling to the component, and a resistor mounted ... | 04/15/2008 |
| 7352271 | Probe and contour measuring instrument A probe body (200) includes a middle closing portion (250) formed upright on a connector front portion (261A) and a female thread (261D) into which a male screw (110) is screwed. A sensor module (300) includes a slidable-con... | 04/01/2008 |
| 7292019 | Method for accurately setting parameters inside integrated circuits using inaccurate external components 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 ... | 11/06/2007 |
| 7215176 | Analog value adjustment circuit, display driver circuit, and method of adjusting analog value An analog value adjustment circuit includes a fuse circuit that outputs fuse data whose value changes corresponding to whether first through Nth (N is an integer of two or more) fuse elements are in a cutting state, or in a non-cutting state and an analog value outp... | 05/08/2007 |
| 7208919 | Method and apparatus for digitally regulating an output voltage using noise-shaped component selection Provided is a digitally-controlled linear regulator having noise-shaped component selection. The digitally-controlled linear regulator has a regulated-voltage sensor, a comparator module, a quantization module, and an impedance switching network. The regulated-volta... | 04/24/2007 |
| 7177610 | Calibrated low-noise current and voltage references and associated methods A low-noise current reference circuitry includes a voltage source, a current source, and a controller. The voltage source generates a reference voltage. The current source provides a low-noise output current in response to a control signal. The controller provides t... | 02/13/2007 |
| 7071669 | Reference voltage generation circuit, display driver circuit, display device, and method of generating reference voltage 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 ... | 07/04/2006 |
| 7042200 | Switching mode power conversion with digital compensation The present invention provides improved line and load regulation of a switching-mode power converter (300) without requiring additional capacitors (255), either internally or externally, to stabilize the control loop. The present invention can provide ... | 05/09/2006 |
| 7043386 | Potentiometer providing a high resolution A high resolution potentiometer implemented using at least two digital potentiometers connected in parallel. Each digital potentiometer is controlled to provide a corresponding resistance value, and a desired resistance value is attained by such control. The resolut... | 05/09/2006 |
| 7012555 | Digital potentiometer including at least one bulk impedance device Embodiments of a digital potentiometer are disclosed that require lesser numbers of components than conventional digital potentiometers. A first string of elemental impedance devices, and at least one bulk impedance device, are provided between first and second refe... | 03/14/2006 |
| 6967529 | Large dynamic range programmable gain attenuator A design of integrated circuit components to prevent accidental turn on when large input signals are accepted. With integrated circuits operated at lower power supply voltages, input signals having large peak values can tend to turn on devices within the integrated ... | 11/22/2005 |
| 6917245 | Absolute power detector A method and apparatus is provided for detecting the output power of a power amplifier. The output power is detected by detecting the absolute values of the voltage and current at the output of the amplifier and mixing the detected voltage and current to generate a ... | 07/12/2005 |
| 6882136 | Variable impedance network for an integrated circuit potentiometer 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 a... | 04/19/2005 |
| 6822345 | Chip/package resonance damping using controlled package series resistance A method and apparatus for reducing an impedance of a power supply path of an integrated circuit is provided. The power supply path includes a first power supply line and a second power supply line to provide power to the integrated circuit. At least one resistive e... | 11/23/2004 |
| 6693394 | Brightness compensation for LED lighting based on ambient temperature A circuit regulates the flow of current to a bank of light emitting diodes (LEDs). The circuit is sensitive to ambient temperature and increases the voltage at the LEDs in the circuit. Consequently, the current flow to the LEDs will increase when the ambi... | 02/17/2004 |
| 6555996 | High-resolution, high-precision solid-state potentiometer 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 ... | 04/29/2003 |
| 6476591 | Power supply device for driving liquid crystal, liquid crystal device and electronic equipment using the same A power supply device for driving liquid crystal which generates four liquid crystal drive voltages V1 and V4 between first and second reference voltages, the power supply device comprising: a voltage division circuit 102 which divides a voltage between v... | 11/05/2002 |
| 6373236 | Temperature compensated power detector A temperature compensated power detector generally comprises a detector circuit portion, which includes a detector diode, and a temperature compensation circuit portion, which includes a temperature compensation diode, that is operably connected to the de... | 04/16/2002 |
| 6368734 | NTC thermistors and NTC thermistor chips An NTC thermistor has an electrically insulating substrate, a temperature-sensitive film on a surface of the substrate containing oxide of rare earth elements such as LaCoO3 as its principal component by at least 50 weight %, and a pair of elec... | 04/09/2002 |
| 6362606 | Method and apparatus for regulating a voltage An RF power amplifier is provided for use with wireless transmission systems such as cellular phones. An RF power amplifier includes direct drive amplifier circuitry operating in a push-pull scheme. The RF power amplifier includes a pair of switching devi... | 03/26/2002 |
| 6359428 | Semiconductor integrated circuit device having an output voltage setting function A voltage output device outputs an analog voltage obtained by dividing a supply voltage with a plurality of resistor elements. The resistor elements are individually connected in parallel with fuse elements and switching transistors. The fuse elements hav... | 03/19/2002 |
| 6342782 | Power supply device for driving liquid crystal, liquid crystal device and electronic equipment using the same A power supply device for driving liquid crystal which generates four liquid crystal drive voltages V1 and V4 between first and second reference voltages, the power supply device comprising: a voltage division circuit 102 which divides a voltage between v... | 01/29/2002 |
| 6331768 | High-resolution, high-precision solid-state potentiometer 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 ... | 12/18/2001 |
| 6194888 | Impedance-to-voltage converter and converting method An impedance-to-voltage converter utilizes an operational amplifier to convert an impedance into a voltage without suffering from the influence of stray capacitances. The impedance-to-voltage converter is formed of an operational amplifier which has an im... | 02/27/2001 |
| 6113760 | Power supply apparatus for sputtering and a sputtering apparatus using the power supply apparatus The present invention provides a sputtering power supply apparatus which realizes stable sputtering at a pressure lower than the discharge start pressure, so that scattering of sputtering particles due to collision with sputtering inert gas can be reduced... | 09/05/2000 |
| 6087823 | Electronic inductance circuit There is provided an electronic inductance circuit having a transistor, a first resistor, a second resistor, a capacitor and a first current source. The main current path of the transistor and the first resistor are connected in series to form a first ser... | 07/11/2000 |
| 6046581 | Microprocessor load emulator A load emulator provides a high current load having a specified high slew rate to replicate the load and transient currents generated by advanced high speed microprocessors. The load emulator is implemented in the form of an L-C delay line having taps bet... | 04/04/2000 |
| 5814981 | Voltage circuit for generating multiple stable voltages In a multi-valued voltage generating circuit including a voltage divider connected between first and second nodes and formed by a series of resistors, and an output circuit, connected to the first and second nodes and nodes of the resistors, for selecting... | 09/29/1998 |
| 5783872 | Auxiliary battery voltage/temperature compensation for automotive 12 volt system for electric vehicles A battery temperature compensation circuit for a DC/DC converter which is used to charge an auxiliary battery for an electric vehicle and including, among other things, a voltage sensitive resistance, such as a thermistor, coupled to a clamped voltage div... | 07/21/1998 |
| 5611952 | Temperature sensor probe and sensor detection circuit A sensor probe and sensor detection circuit used in an electronic temperature control circuit for preventing the control circuit from driving an external device such as a heater when the sensor probe has been disconnected from the control circuit. The sen... | 03/18/1997 |
| 5587649 | Thermal performance matched current limiting circuit, and battery using same A battery pack (10) includes a circuit (14) for assuring that a device (16) connected to the battery pack performs in a manner consistent with design requirements, while not exceeding certain thresholds for safety in volatile environments. The battery pac... | 12/24/1996 |
| 5565768 | Apparatus for detecting metallic debris in dielectric fluid having an indirectly heated thermistor for balancing a bridge network In an inductive debris monitor (IDM) an inductive probe is disposed at a fluid flow passageway to be monitored, and an RF bridge containing a variable resistance network is used to detect changes in the impedance of the probe due to the passage of metalli... | 10/15/1996 |
| 5543705 | Voltage regulating circuit and PTC element for automotive vehicles A voltage regulating circuit for automotive vehicles includes: a supply voltage; a load; and a Positive Temperature Coefficient ("PTC") resistance element connected in series between the supply voltage and the load, for regulating voltage applied from the... | 08/06/1996 |
| 5506494 | Resistor circuit with reduced temperature coefficient of resistance A resistor circuit includes a pair of linear conductive films and a resistive film. The resistive film is formed on an area between the conductive films and electrically connected to the conductive films. A pair of terminals are electrically connected to ... | 04/09/1996 |
| 5464964 | Image heating apparatus changing set temperature in accordance with temperature of heater An image heating apparatus includes a heater; temperature detector for detecting a temperature of the heater; electric power supply controller for controlling electric power supply to the heater during image heating, so that the temperature detector detec... | 11/07/1995 |
| 5389872 | Signal processing system and method of reducing switch error attributable to switch impedances A system and method minimizing switching errors in voltages delivered to a resistive load. Switch impedances can be significant when small resistor values are utilized. A system relies on varying the resistance in the switches to compensate for the output... | 02/14/1995 |
| 5373141 | Fusing temperature control circuit A circuit for controlling the temperature of a system by sensing a temperature is disclosed. The circuit includes a heater heated by a given control signal, a thermistor installed around the heater and having variable resistivity according to an environme... | 12/13/1994 |
| 5291123 | Precision reference current generator An integrated current generator circuit operates in conjunction with a known reference voltage and internal and external reference resistances. The current generator circuit includes three operational modes. In the first operational mode, the reference vo... | 03/01/1994 |
