Class 323/298 - Variable resistor

Subclass of Class 323 - Electricity: power supply or regulation systems
Definition: Subject matter wherein different portions or a combination
No. of patents: 34
Last issue date: 08/12/2008

Number	Title	Issue Date
7411375	Apparatus for issuing an electrical output signal An apparatus for issuance of at least one electrical output signal (Iout), wherein the desired electrical current level of the output signal (Iout) is predeterminable, including: at least one measuring resistor, at which the electrical current level of the output si...	08/12/2008
7365518	Ion engine power supply A power supply for an ion engine comprises a multiphase alternator and a power converter comprising a voltage multiplier coupled to each phase of the alternator. Each voltage multiplier comprises one or more staged voltage doublers. The alternator phases may be coup...	04/29/2008
7269239	Simple two-wire communication protocol with feedback status A two-wire communication protocol between a controller device and a controlled device, wherein both devices are coupled by a clock line and a data line. The controller device sends control signals comprising N bits, N being greater than or equal to two, to the contr...	09/11/2007
7219263	Method and system for minimizing memory corruption A system and method for minimizing memory corruption at power up and/or reset is provided. The system includes, a digitally controlled potentiometer between an adapter and the memory; and a voltage divider functionally coupled to the potentiometer. The voltage divid...	05/15/2007
7196570	Multiple-time programmable resistance circuit 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 se...	03/27/2007
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
7009313	Multi-compliance voltage generator in a multichannel current stimulator An improved multi-voltage power supply charges individual small capacitors to different voltages. Each small capacitor is assigned to a circuit, and is charged to a voltage level sufficient for the circuit. In one embodiment, an improved switching regulator includes...	03/07/2006
7005837	Digital potentiometer including output buffer A digital potentiometer is disclosed that includes first, second, and third signal terminals. A chain of series-connected impedance elements with multiple tap points is connected between the first and second signal terminals. A plurality of first switching devices a...	02/28/2006
6922046	Variable impedance network with coarse and fine controls 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, sel...	07/26/2005
6922065	Coil impendance detection method and object detection method and apparatus using the same A triangular wave generating circuit (21) generates a sweep voltage of a triangular wave, a VCO (22) generates a sweep of a frequency according to the sweep voltage, and a driving coil (4) is driven by the sweep voltage. From the current flowing...	07/26/2005
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
6788042	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...	09/07/2004
6771053	Buffered configurable nonvolatile programmable digital potentiometer A digital potentiometer, configurable and programmable using nonvolatile memory is disclosed. A unity-gain configured, rail-to-rail operational amplifier, used as voltage follower of buffer, can be inserted, by programming, between an internal wiper terminal and an ...	08/03/2004
6744244	Variable impedance network with coarse and fine controls 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, sel...	06/01/2004
6600297	Power supply unit for regulating output voltage using a series regulator A power supply unit having a series regulator that changes an input DC voltage input from a DC power supply into a stabilized output DC voltage lower than the input DC voltage, includes: a power consuming unit, provided on a direct current path between th...	07/29/2003
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
6552519	Variable impedance network for an integrated circuit 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. ...	04/22/2003
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
5859527	Electrical signal supply with separate voltage and current control for an electrical load An electrical signal supply apparatus independently controls and regulates voltage and current in supplying microampere currents to skin tissue of patients. The apparatus enables operators to select a desired voltage level independent of the requirement t...	01/12/1999
5841271	Test mode power circuit for integrated-circuit chip A power supply circuit for an integrated-circuits chip includes variable resistors for establishing an internal voltage for the chip. The internal voltage is variable with the variable resistors and compared by a comparator to a test voltage supplied from...	11/24/1998
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
5701071	Systems for controlling power consumption in integrated circuits Systems for controlling the current consumption of an integrated circuit chip and the like so as to reduce the inductive voltage drops occurring over the power supply lines within the chip and power supply lines to the chip are disclosed. The systems acco...	12/23/1997
5444610	High-power modulator A high-power modulator includes a plurality of means for limiting voltage and a plurality of controllable switches. Each of the switches is connected in parallel with a different one of the voltage limiting means to form a plurality of parallel pairs. Eac...	08/22/1995
5198745	Dynamic braking resistor system A dynamic braking system resistor for stabilizing a power system during power system disturbances includes a braking resistor for coupling with a power system bus. A controller monitors a power system parameter, such as the speed of a generator coupled wi...	03/30/1993
5097197	Signal level attenuating device A signal level attenuating device having an analog attenuator and a digital attenuator which respectively include resistance attenuators. The resistance attenuators have the same attenuating characteristics and are mutually coupled. When one of the resist...	03/17/1992
5084667	Nonvolatile nonlinear programmable electronic potentiometer A variable impedance circuit for use in an external circuit is disclosed. The impedance value is selected by an external circuit. The variable impedance is generated between two terminals which are accessible for connection to external circuitry. The impe...	01/28/1992
5079500	Potentiometric circuit arrangement A potentiometric circuit arrangement 30 is based on a resistive potentiometer tarck 11 with a capacitively coupled `wiper` 14', the resistive track being driven by switched alternating voltages of +/- V at 12 and -/+(X-V) at 13, where X is a reference vol...	01/07/1992
5049827	Non-contacting potentiometer A non-contacting potentiometer includes a resistor and a movable probe which capacitively couples AC signals applied to the resistor to an output terminal. A closed loop control circuit is coupled to the resistor and the probe to compensate for variations...	09/17/1991
4862058	Voltage regulator A voltage regulator that reduces the voltage output of a generator to make it appropriate for use with an external load. The voltage regulator includes a starting unit for use with on-demand generators to cause the on-demand generator to start without pre...	08/29/1989
4673864	Circuit comprising series-connected semiconductor elements A plurality of controlled avalanche semiconductor elements, are connected in series and are irradiated with a controllable quantity of light to form circuits which in principle can switch an unlimited high voltage or can control such a voltage. Dissipatin...	06/16/1987
4673866	Constant voltage generator using memory transistors A constant voltage generator includes a resistance adjustable resistor having a series connection of a main resistor and sub-resistors, a circuit cooperating with the series connection to produce a constant voltage, a plural number of transistors having a...	06/16/1987
4531111	Voltage divider in thin- or thick-film technology A calibratable voltage divider made by thin-film or thick-film technology formed by a flat film is an ohmic voltage divider resistor connected to have current flow through it. At least one tap is provided to tap off a desired divider voltage. The ohmic vo...	07/23/1985

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Class 323/298 - Variable resistor