Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 7499298 | Semiconductor integrated circuit and controlling method thereof A semiconductor integrated circuit includes: a power supply circuit; a voltage-current conversion circuit connected with an output of the power supply circuit, the voltage-current conversion circuit having an output terminal; a current-voltage conversion circuit con... | 03/03/2009 |
| 7433800 | System and method for measuring performance of a voltage regulator module attached to a microprocessor A system for measuring performance of a voltage regulator module (VRM) attached to a microprocessor includes: a voltage transient tester (VTT) fixture (5) for setting different working voltage levels of the VRM; an oscillograph (2) for measuring transi... | 10/07/2008 |
| 7354269 | Electro-optical device for the photo-polymerization of composite material The invention relates to an electro-optical device for the photo-polymerization of composite material, and is used in particular in the dental field. The inventive device comprises a light source (2) which is defined by an LED or a group of LEDs. It comprises... | 04/08/2008 |
| 7239184 | Low power and high efficiency voltage-to-current converter with improved power supply rejection A low power and high efficiency voltage-to-current (V/I) converter designed with few parts and having improved power supply rejection. The V/I converter may include an op-amp, a MOSFET, and a first and second voltage dividers. The first voltage divider circuit may i... | 07/03/2007 |
| 7236375 | DC/AC converter and its controller IC An inverter has a semiconductor switch circuit in the primary winding of a transformer such that each of the switches of the switch circuit is controlled by pulse-width modulation (PWM) to supply a constant ac current and a constant ac voltage to a load, such as a c... | 06/26/2007 |
| 7224156 | Voltage regulator for use in portable applications A voltage regulator includes a first stage capable having a first current flowing through it. A second stage has a second current. A third stage is capable of outputting an output voltage and has a third current flowing through it. The first, second and third curren... | 05/29/2007 |
| 7161817 | Current/charge-voltage converter and reset method A current/charge-voltage converter having an operational amplifier and a first capacitor connected between the input terminal and the output terminal of the operational amplifier, comprising a first switch which has one end connected to this input terminal, a first ... | 01/09/2007 |
| 7151414 | Method and circuit for frequency synthesis using a low drift current controlled oscillator with wide output frequency range A method and circuit for frequency synthesis using a low drift current controlled oscillator configured to provide a wide output frequency and high accuracy are provided. An exemplary frequency synthesis circuit is configured for programmable control of a center fre... | 12/19/2006 |
| 7148734 | Analog level shifter An analog level shifter includes a voltage output circuit which generates a first voltage and a second voltage in response to an input voltage and which adds the second voltage to the first voltage to output a third voltage, a voltage-current converting circuit to w... | 12/12/2006 |
| 7145395 | Linear transconductance cell with wide tuning range A transconductance cell is disclosed. The transconductance cell may be single-ended or differential. The transconductance cell may include a tunable degeneration circuit. The tunable degeneration circuit may have a plurality of field effect transistors connected in ... | 12/05/2006 |
| 7142625 | Nuclear material detection apparatus and method A device for detecting photonuclear-induced neutrons is described herein. One embodiment of the device may comprise a neutron detector and a detection circuit. The neutron detector may comprise a detector output. The detection circuit may be operatively connected to... | 11/28/2006 |
| 7131644 | Imaging apparatus having an automatic sheet feeder An imaging apparatus includes a sheet separation surface positioned along the sheet feed path downstream from a media tray. A plurality of pivoting arms is mounted in the imaging apparatus. The pivoting arms are moveable between a first position and a second positio... | 11/07/2006 |
| 7123081 | Temperature compensated FET constant current source A constant current source comprises a FET, a bandgap reference voltage source coupled to its gate terminal and a resistor coupled to its source terminal. The width and length of the FET are configured so that the temperature coefficient (TEMPCO) of Vgs of... | 10/17/2006 |
| 7109961 | Electric circuit, latch circuit, display apparatus and electronic equipment In order to perform operations securely, a high potential power supply is connected to a gate electrode of a P-type TFT to which data signals are input. Similarly, a low potential power supply is connected to a gate electrode of an N-type TFT. Thus, a TFT to which d... | 09/19/2006 |
| 7106606 | Voltage-current converter with adjustable quiescent current Method for controlling an output signal (A) of a voltage-current converting device, to which a reference voltage (UREF) is fed and in which a voltage signal (I, IX) applied on the input side is converted into a current signal, a reference voltage (UR... | 09/12/2006 |
| 7057909 | Current/charge-voltage converter A current/charge-voltage convert circuit having an operational amplifier and a capacitor connected between the input terminal and the output terminal of the operational amplifier, this current/charge-voltage convert circuit characterized in that it comprises a first... | 06/06/2006 |
| 7002412 | Transconductance circuit A transconductance circuit having a feedback element for maintaining constant potential differences at a differential amplifier, which in turn allows an intermediate current signal to flow through a resistive load directly proportional to an input voltage signal. Th... | 02/21/2006 |
| 6949984 | Voltage controlled oscillator having control current compensation A voltage controlled oscillator (600) includes a voltage to current portion (400) that is inversely proportional to the semiconductor processing in order to compensate for variations both in the low-frequency and high-frequency portions of the VCO gain... | 09/27/2005 |
| 6917322 | I/V converter circuit and D/A converter In an I/V converter circuit and a D/A converter, a wide pass band for signal can be obtained and current consumption can be reduced. A current is supplied through an input terminal to a first node, and a first bias current is supplied from a first bias-current gener... | 07/12/2005 |
| 6917316 | Digital adjustment of gain and offset for digital to analog converters Improved digital to analog converter (DAC) circuitry incorporating the ability to utilize a single DAC to generate either voltage or current outputs, and the ability to digitally adjust the gain and offset. Previous digital to analog circuitry has been limited to a ... | 07/12/2005 |
| 6828832 | Voltage to current converter circuit An improved voltage to current converter circuit having three stages. The first stage amplifies the input voltage signals. The second stage includes first and second/third current sources that are connected in a current mirror configuration with a common node thereb... | 12/07/2004 |
| 6657420 | Accurate ultra-low current generator A method and apparatus provide for accurate low current generation using switched capacitor techniques. The current generator includes a reference voltage generator that provides a reference signal to a switched capacitor integrator. In one example, the r... | 12/02/2003 |
| 6628534 | Method and apparatus for improving voltage to current signal conversion A method and apparatus is provided for converting a voltage signal into a current signal. A differential circuit is used to convert a voltage signal into a current signal. The differential circuit comprises at least one feedback amplifier to reduce non-li... | 09/30/2003 |
| 6504736 | Current-voltage converter There is intended to provide a current-voltage converter capable of surely outputting a voltage output signal regardless of current intensity when converting a current input signal with wide current range into a voltage output signal. In case a current va... | 01/07/2003 |
| 6498738 | Reverse level shift circuit and power semiconductor device A reverse level shift circuit that is low in cost and excellent in reliability is provided by employing no Pch-DMOS transistor and forming it together with a level shift circuit on one semiconductor substrate. An input voltage signal (VIN) on high side is... | 12/24/2002 |
| 6346804 | Impedance conversion circuit There is disclosed an impedance conversion circuit called a regulated cascode circuit in which a parasitic capacity deteriorating frequency characteristics is reduced during operation up to about several hundreds of megahertz or higher frequencies. In the... | 02/12/2002 |
| 6323630 | Reference voltage generation circuit and reference current generation circuit A reference voltage generation circuit includes a first current conversion circuit for converting a forward voltage of a p-n junction into a first current proportional to the forward voltage, a second current conversion circuit for converting a voltage di... | 11/27/2001 |
| 6324083 | Method of and arrangement for converting voltage to current An arrangement (1) for converting voltage (Vin) into current (Iout), implemented on a chip (100), comprises a first V/I converter (3), the operation of which is based on a conversion resistor (Rconv) formed on the chip. Th... | 11/27/2001 |
| 6304070 | Voltage/current converter circuit and high-gain amplifying circuit A voltage/current converter circuit includes a first differential pair circuit containing a first pair of MOS transistors, a second differential pair circuit containing a second pair of MOS transistors wherein the drain terminals thereof are connected to ... | 10/16/2001 |
| 6219261 | Differential voltage-to-current converter In a wide dynamic range and with constant transconductance (Gm) differential voltage-to-current converter, operating in class AB, essentially comprising two complementary pairs of transistors, respectively of pnp (Q1, Q2) and npn (Q3, Q4) type, and two no... | 04/17/2001 |
| 6181586 | Current-to-voltage converter and associate closed-loop control circuit The invention relates to a current-to-voltage converter comprising an input connected to a first inductance, a capacitor and a diode, an isolation transformer in connection with a first connection of a primary winding, a second connection is connected wit... | 01/30/2001 |
| 6160391 | Reference voltage generation circuit and reference current generation circuit A reference voltage generation circuit includes a first current conversion circuit for converting a forward voltage of a p-n junction into a first current proportional to the forward voltage, a second current conversion circuit for converting a voltage di... | 12/12/2000 |
| 6094366 | Current-to-voltage converter and associate closed-loop control circuit A current-to-voltage converter (10), in particular for high input voltages, comprising a primary side (14), which comprises several serially connected partial systems (16, 18, 20), including respectively at least one transistor circuit breaker (T1, T2, T3... | 07/25/2000 |
| 6064582 | Current converter for increasing current and decreasing voltage A continuously controlled current increasing charge pump having n series-connected input capacitors coupled to a voltage/current source for developing a constant output voltage of at least ##EQU1## and an output current Io =nIin. | 05/16/2000 |
| 6060870 | Voltage-to-current converter with error correction A voltage-current converter includes a signal voltage source (2), a series resistor (4) and an electronic circuit with a first transconductance amplifier (12) and a second transconductance amplifier (22). The corresponding inputs (16, 20; 24, 26) of the t... | 05/09/2000 |
| 6058033 | Voltage to current converter with minimal noise sensitivity A voltage to current (V-I) converter includes a low pass filter, a first converting element, a second converting element, and an output. The low pass filter receives an input voltage signal and outputs a filtered voltage signal. The output of the low pass... | 05/02/2000 |
| 5986910 | Voltage-current converter The present invention provides a voltage-current converter which can decrease the circuit scale excluding the capacitor for the stability operation, and which can select one from among two or more output currents is disclosed. Constant voltage Vr generate... | 11/16/1999 |
| 5978240 | Fully differential voltage-current converter A fully differential voltage-current converter, comprising a differential operational amplifier which is supplied with a differential voltage to be converted into a current, a first transistor being fedback to a noninverting input of the amplifier, a seco... | 11/02/1999 |
| 5978241 | Wide-linear range tunable transconductor using MOS Apparatus for converting input voltage to output current is disclosed herein. The apparatus mentioned above includes an input stage and a tuning stage. The input stage is used to generate a gate voltage corresponding to the input voltage, which is electri... | 11/02/1999 |
| 5903183 | Constant voltage circuit and constant voltage/constant current changeover circuit A constant voltage circuit and a constant voltage/constant current changeover circuit hold a voltage, applied to a load, to a constant level regardless of the variation of a load current. To this end, the changeover circuit includes a first circuit with a... | 05/11/1999 |
