Abstract: The present disclosure relates to voltage regulator circuitry. The voltage regulator circuitry comprises an output device configured to provide a regulated output voltage and a controllable shunt device configured to provide a current path from the output device for a shunt current. The shunt current is variable according to a control signal supplied to the controllable shunt device.

Abstract: Digital-to-analog conversion circuit, digital-to-analog conversion method, display apparatus are disclosed.

Abstract: A voltage divider circuit regarding a battery voltage and an associated electronic device equipped with the voltage divider circuit are provided. The voltage divider circuit may include a first level shifter circuit, a second level shifter circuit and a controlled voltage divider. The first level shifter circuit selectively performs a first level shifting operation on an original enable signal according to respective voltage levels of multiple control signals to generate a first enable signal. The second level shifter circuit selectively performs a second level shifting operation on the first enable signal according to a voltage level of the first enable signal to generate a second enable signal. The controlled voltage divider selectively performs a voltage dividing operation on the battery voltage according to a voltage level of the second enable signal to generate a divided voltage of the battery voltage to be an output of the voltage divider circuit.

Abstract: A power supply circuit, its generating and control methods are presented, relating to smart wearable devices. The power supply circuit comprises a Bandgap voltage reference, a real-time detection and control circuit, and a substitute voltage source. The real-time detection and control circuit is connected to the Bandgap voltage reference and the substitute voltage source, and adjusts an output voltage of the substitute voltage source to match an output voltage of the Bandgap voltage reference. After these output voltages are equal, the output voltage of the power supply circuit is provided by the substitute voltage source, and the Bandgap voltage reference can be disconnected from the circuit. This circuit can lower the power consumption of the Bandgap voltage reference without affecting the stability of the voltage output.

Abstract: A power manager including a power bus operable at a DC bus voltage. A plurality of device ports operably connect to the power bus. A first data processing device and a first memory device are associated with the first data processing device. A data communication channel extends between the first data processing device and each of the plurality of device ports. An energy management schema operates on the first data processing device. For each of the plurality of device ports, the energy management schema establishes a communication link with an external power device connected to the device port over the data communication channel and determines if an external power device is connected to the device port and if so, determines an external power device type.

Abstract: A band gap reference voltage generator has first and second current conduction paths between a first node and a second node. The first current conduction path has first resistive elements in series with a first forward-biased PN junction element. A tap is connected selectively to the first resistive elements through switches that are controllable to select a voltage divider ratio at the tap. The second current conduction path includes a second resistive element in series with a second PN junction element of greater current density than the first PN junction. A voltage error amplifier has inputs connected to the tap and the second PN junction element, and an output for providing a thermally compensated output voltage VREF. A feedback path applies the output voltage VREF through a third resistive element to the first node.

Abstract: A power supply has first and second reference voltage sources; a step-down voltage generator, including a transistor supplied with a first voltage, a resistor string between the transistor and a second voltage, and an op-amp which controls the transistor, and outputting the voltage at a first node among nodes in the resistor string; switches, coupled to the nodes; a comparison circuit, which compares the voltage at a common node the switches coupling in common with the second reference voltage source; and a calibration control circuit, which selects any switch according to a comparison result to calibrate. During calibration, the calibration control circuit couples a second node among the nodes to a non-inverting terminal of the op-amp, and the first reference voltage source to an inverting terminal of the op-amp, and after calibration, couples the common node to the non-inverting terminal, and the second reference voltage source to the inverting terminal.

Abstract: A voltage regulator includes a voltage generation unit, a first resistor section, and a second resistor section. The voltage generation unit compares a reference voltage level with a voltage level of a first node and generates an output voltage. The first resistor section includes a first sub-resistor and a second sub-resistor between the first node and a ground voltage node, and controls a connection between the first sub-resistor and the second sub-resistor to change a resistance value of the resistors. The second resistor section includes a reference resistor, a plurality of unit resistors, and a plurality of step resistors, and controls connections of the unit resistors and the step resistors to change a resistance value of the resistors.

Abstract: A voltage regulator includes a voltage output unit configured to output an output voltage to a voltage output terminal; a first resistance divider configured to regulate a divided resistance value in response to a first series of control signals; and a second resistance divider configured to regulate the divided resistance value, which is determined in the first resistance divider, in response to a second series of control signals. A voltage level of the output voltage output through the voltage output terminal is regulated according to a ratio of the divided resistance value determined through the first resistance divider and the second resistance divider and a resistance value of a reference resistor.

Abstract: A current generator includes an op-amp having a negative terminal arranged to be coupled to an input voltage, a resistance selection circuit having at least one tunable resistor connected with each other, and at least one power transistor. A gate of the at least one power transistor is coupled to an output of the op-amp, and a drain of the at least one power transistor is coupled to the at least one tunable resistor or a load. The resistance selection circuit is configured to select a node of the at least one tunable resistor based on the input voltage for coupling from a positive terminal of the op-amp. The at least one tunable resistor is configured to adjust a resistance setting to control a current level of the current generator based on a power supply voltage or a current of a reference resistor.

Abstract: The present disclosure discloses a voltage regulator including a trimming circuit. The present disclosure also discloses a method for trimming an output voltage of a voltage regulator. In one embodiment the voltage regulator may include a power conversion module, a feedback and trimming module and a control module. The voltage regulator may be able to provide an output voltage that could be regulated to a plurality of output values, the feedback and trimming module may be able to trim the plurality of output values to their desired values successively and independently.

Abstract: A voltage-modulated circuit device uses a power source of a modulation circuit to acquire a predetermined trigger voltage through a voltage acquisition circuit and a step-down circuit to step down a voltage, and then a voltage amplification circuit amplifies the voltage by several times, such that the trigger voltage amplified by several times still falling within the range of predetermined voltage values triggers and conducts a switch circuit, and the power source of the modulation circuit can flow from an anode to a cathode in order to supply an electric power with a step-down voltage. With the design of triggering the conduction, the voltage of the modulation circuit can be modulated automatically to maintain the electric power supplied to the circuit device within the range of required voltage values, only if the trigger voltage has the predetermined voltage value.

Abstract: A voltage generator circuit comprises a resistor string, a drive mechanism configured to drive a drive signal, a voltage feedback network, and a voltage tap point. The voltage tap point is located along the resistor string. The voltage tap point is configured to be selectively coupled simultaneously with the drive mechanism and the voltage feedback network, such that an output of the voltage tap point is selectively coupled with the drive mechanism via the voltage feedback network.

Abstract: A highly accurate voltage reference and temperature sensor circuit requires only several low-cost components in addition to a general-purpose microcontroller with an analog-to-digital converter. Unlike known circuits, the circuit disclosed does not rely on matching between a pair of semiconductor devices, as only a single semiconductor junction is used. All of the signal processing may be performed digitally.

Abstract: A voltage reference containing a programmable resistance portion at an output node at which an output reference voltage is provided. The desired magnitude of the programmable portion which provides optimum matching of an output resistance of the voltage reference and a series resistance of an output capacitor of the voltage reference is determined and hard-programmed. As a result, the output voltage of the voltage reference is provided with improved linearity. In an embodiment, the determination of the magnitude of the programmable portion is performed by providing an input to an analog to digital converter (ADC) with the voltage reference driving the ADC. The resistance setting corresponding to the third harmonic being less than a desired threshold is then hard-programmed. In an alternative embodiment, the programmable portion is set to specific resistance dynamically during operation.

Abstract: A method and an apparatus for supplying power to a 300 PIN MSA 40 Gb TRANSPONDER (22), wherein the apparatus comprises a power supply control module (21), a first resistor (R2), a second resistor (R3) and a third resistor (R4). The power supply control module (21) supplies power to the TRANSPONDER (22) through the APS Digital pin (APS Digital) of the TRANSPONDER (22). A reference voltage terminal (Vfeedback) of the power supply control module (21) is connected to the APS Sense pin (APS Sense) of the TRANSPONDER (22) by the second resistor (R3), connected to the APS Set pin (APS Set) of the TRANSPONDER (22) by the first resistor (R2) and connected to the bias voltage terminal (Vbias) of the power supply control module (21) by the third resistor (R4). The method and the apparatus can increase selection of the power supply control module (21) without occupying excessive space of circuit board, while ensuring precision of supply voltage.

Abstract: The present disclosure discloses a voltage regulator comprising a trimming circuit. The present disclosure also discloses a method for trimming an output voltage of a voltage regulator. In one embodiment the voltage regulator may comprise a power conversion module, a feedback and trimming module and a control module. The voltage regulator may be able to provide an output voltage that could be regulated to a plurality of output values, the feedback and trimming module may be able to trim the plurality of output values to their desired values successively and independently.

Abstract: A voltage generator is provided. The voltage generator includes a voltage pump and a voltage controller. The voltage pump generates a target voltage using a clock signal. The voltage controller compares a temporary voltage input from the voltage pump with a reference voltage to generate a control signal controlling the voltage pump. The voltage controller includes a string of a plurality of resistors connected in series to change a level of the temporary voltage to a voltage level of a corresponding comparison voltage. When the plurality of resistors are in a string, a resistance of a resistor closest to one end of the string is greater than resistances of other resistors of the string. The voltage controller may further include a jumping unit controlling connection or disconnection of two arbitrary nodes among first to n-th nodes (where n is a natural number) defined as connection points of the adjacent resistors of the string.

Abstract: A voltage generator includes a charge pump, a voltage dividing circuit, and a comparator. The charge pump can output a high voltage. The dividing circuit includes a plurality of resistors and at least one switch. The dividing circuit can generate a first divided voltage of the high voltage when the switch is turned on and a second divided voltage of the high voltage when the switch is turned off. An output signal of the comparator can control the switch and the charge pump. The dividing circuit and the comparator form a feedback loop so that the response speed of the comparator can be increased and the ripples of the high voltage outputted from the charge pump can be decreased.

Abstract: This invention provides a digital-analog converter circuit capable of appropriately correcting the optical characteristics of the liquid crystals according to the change in design or the preference of the user, and achieving goals of miniaturization, cost-lowering, as well as wide design suitability. The digital-analog converter circuit includes a storage device for storing a voltage characteristic curve, a modulating device for generating a frequency signal in accordance with a data from the voltage characteristic curve stored in the storage device in response to a selected data, a variable resistance device connected between a first power source and a second power source, in which the resistance value of the variable resistance device is changed in accordance with the frequency signal from the modulating device, a holding device for holding a voltage generated at the variable resistance device, and an output device for outputting the voltage to a desired output end.

Abstract: A trimming circuit which comprises a shunt circuit having two shunt resistors and two shunt ON/OFF switches and connected in parallel with a series resistor circuit. The middle point of the shunt circuit is connected to a connection point of the series resistor circuit, the resistance ratio thereof with respect to the connection point being equal to the resistance ratio of the shunt resistors.

Abstract: A standby circuit is provides to on/off a power converter for power saving. The standby circuit includes a comparison circuit. The comparison circuit is coupled to a feedback loop of the power converter to generate a mode signal when a feedback signal of the feedback loop is lower than a threshold signal. A resistive device is coupled to the feedback loop. The resistance of the resistive device is increased in response to the mode signal. The mode signal is further coupled to turn off a switching control circuit of the power converter.

Abstract: The present invention relates to voltage converters and especially to a control circuit with an input from the voltage converter output and arranged to control the voltage level on the voltage converter output. The problem addressed relates to the situation when there is a pre-bias voltage on the converter output at the moment it is switched on. The object of the control circuit is to increase the voltage on the converter output fast and avoiding any drain of voltage or current from the output at the start up sequence. This is performed by a comparator in the control circuit that is arranged to compare the reference voltage with a division of the output voltage and if the reference voltage is lower that the divided output voltage the reference voltage is increased at the comparator output. The comparator circuit includes an OP-amplifier.

Abstract: A control circuit is provided to generate a mode signal at light load of the power converter. The mode signal is coupled to disable the switching signal for saving power. The impedance of an input circuit is increased in response to the mode signal. Furthermore, a soft start circuit is initiated by the mode signal when switching signal is enabled. An external capacitor associates with the impedance of the input circuit determine the off period of the switching signal.

Abstract: In one aspect, there is disclosed a power management device that includes a housing, at least one input port, and at least one output port. Also included is a CPU and a user interface. Electrical circuitry connects the ports, CPU and user interface. The CPU includes a real-time operating system and programs actively controlling a power usage.

Abstract: The present invention relates to voltage converters and especially to a control circuit with an input from the voltage converter output and arranged to control the voltage level on the voltage converter output. The problem addressed relates to the situation when there is a pre-bias voltage on the converter output at the moment it is switched on. The object of the control circuit is to increase the voltage on the converter output fast and avoiding any drain of voltage or current from the output at the start up sequence. This is performed by a comparator in the control circuit that is arranged to compare the reference voltage with a division of the output voltage and if the reference voltage is lower that the divided output voltage the reference voltage is increased at the comparator output. The comparator circuit includes an OP-amplifier.

Abstract: 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 channel resistance controlled by a gate voltage. The channel resistance of the regulator transistor produces a regulated voltage as an output. An op amp compares a reference voltage to a feedback voltage to generate the gate voltage. The feedback voltage is taken from a tap within the variable resistor network. The variable resistor network has select transistors that select one resistor between the regulated voltage and an upper node, and that select one resistor between a lower node and ground. Switches select a tap within a series of resistors between the upper and lower nodes. Y (fine) control bits select the tap while X (coarse) control bits enable select transistors.

Abstract: A potentiometer network includes a first main terminal, a second main terminal, a plurality of resistive elements connected in parallel between the first main terminal and the second main terminal, and means for embedding calibration of said resistive elements in said potentiometer network.

Abstract: To provide a variable voltage dividing circuit capable of changing voltage values of a detection point and a release point along with a change in power supply voltage without changing a hysteresis width.

Abstract: In one aspect, there is disclosed a power management device that includes a housing, at least one input port, and at least one output port. Also included is a CPU and a user interface. Electrical circuitry connects the ports, CPU and user interface. The CPU includes a real-time operating system and programs actively controlling a power usage.

Abstract: 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 parameter, using components external to the IC may include coupling a resistor to the IC and measuring the actual resistance value of the resistor, and based on the measured value, selecting a nominal resistance value from a set of resistance values previously specified by the user. The output voltage, or parameter, may be generated according to the nominal resistance value instead of the actual resistance value, thereby reducing the error that may be incurred due the actual resistance value of the resistor not matching the expected nominal value of the resistor.

Abstract: 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 second connecting nodes, a fuse connected between the first and second connecting nodes, a first resistor with its first end connected to the first connecting node, and a second resistor with its first end connected to the second connecting node, wherein the first and second resistors connect to a third and a fourth connecting nodes, which are the first and second connecting nodes of a next fuse stage respectively, through their second ends.

Abstract: 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 voltages. The second resistance ladder circuit has series-connected resistance circuits each of which has a fixed resistance value, and outputs a plurality of reference voltages. The third 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 voltages. The first to third resistance ladder circuits are connected in series between first and second power supply lines. The resistance values of the variable resistance circuits in the first and third resistance ladder circuits are variably controlled by a given command or a variable control signal input through an external input terminal.

Abstract: 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, selectable at a first specified increment of impedance elements in the plurality of impedance elements. The network further includes a second plurality of switching elements selectively providing a tap positions to the wiper terminal, selectable at a second specified increment of impedance elements in the plurality of impedance elements.

Abstract: 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 at a specified increment value. The first plurality of impedance elements is configured to reduce resistance variation during switching from one tap position to another tap position. The first plurality of impedance element is connected in series in a mirrored configuration about the center impedance element.

Abstract: 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 at a specified increment value. The first plurality of impedance elements is configured to reduce resistance variation during switching from one tap position to another tap position. The first plurality of impedance elements is connected in series in a mirrored configuration about the center impedance element.

Abstract: 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, selectable at a first specified increment of impedance elements in the plurality of impedance elements. The network further includes a second plurality of switching elements selectively providing a tap positions to the wiper terminal, selectable at a second specified increment of impedance elements in the plurality of impedance elements.

Abstract: A progammable power supply for providing a regulated DC output power is disclosed. The power supply provides the output power to any one of a plurality of electronic devices adapted for receiving the output power at an operational voltage or an operational current. The power supply receives a programming signal to maintain the output power at the operational voltage or operational current associated with a particular selected electronic device. Accordingly, by varying the programming signal, the power supply can be programmed to provide output power to any one of several electronic devices having differing input power requirements.

Abstract: A power supply circuit for generating potentials used to drive a liquid crystal, has first to fourth switches (101 to 104) connected in series between a high potential line (105) and a low potential line (106). The first to fourth switches are turned on and off by a switch drive circuit (107) so that the period of time in which the first and third switches are on and the period of time in which the second and fourth switches are on alternate. The power'supply circuit also has the first to third capacitors (111 to 113) of which the state of connection is switched alternately between serial and parallel by the switching operation of the switches. The potential between the second and third switches converges the middle potential between the potentials of the high and low potential lines by the alternate switching between series and parallel connections of the third capacitor (113) to the first and second capacitors (111, 112).

Abstract: A progammable power supply for providing a regulated DC output power is disclosed. The power supply provides the output power to any one of a plurality of electronic devices adapted for receiving the output power at an operational voltage or an operational current. The power supply receives a programming signal to maintain the output power at the operational voltage or operational current associated with a particular selected electronic device. Accordingly, by varying the programming signal, the power supply can be programmed to provide output power to any one of several electronic devices having differing input power requirements.

Abstract: A power supply in accordance with the present invention includes: a resistance voltage-dividing circuit for generating an intermediate voltage, to which a targeted voltage value is allocated, from a supplied voltage; an N-type transistor which causes a current flow into from an outside when the intermediate voltage is higher than the targeted voltage value; a P-type transistor which outputs a current to the outside when the intermediate voltage is lower than the targeted voltage value; differential amplifier circuits having a voltage-follower arrangement, in each of the circuits the fluctuation acceptance range of the intermediate voltage with respect to the targeted voltage value being arranged so as to be equivalent to the difference between the operation-starting voltage of the N-type transistor and the operation-starting voltage of the P-type transistor; and resistances which activate either the P-type transistor or the N-type transistor so as to regulate the intermediate voltage by making the intermediat

Abstract: A converter module which receives an AC voltage, converts the AC voltage to a DC voltage, and outputs the DC voltage to a circuit for driving a motor. The converter module includes a switching device, a diode, and a control circuit which controls the DC voltage output by the converter module by controlling the switching device. The control circuit includes a plurality of DC voltage detection terminals which detect the DC voltage output by the converter module with respective different DC voltage detection gains, a selector which selects at least one of the DC voltage detection terminals in accordance with an external signal indicative of a speed of the motor, and outputs a DC voltage detection value, and a controller which controls the DC voltage output by the converter module in accordance with the DC voltage detection value output by the selector.

Abstract: A progammable power supply for providing a regulated DC output power is disclosed. The power supply provides the output power to any one of a plurality of electronic devices adapted for receiving the output power at an operational voltage or an operational current. The power supply receives a programming signal to maintain the output power at the operational voltage or operational current associated with a particular selected electronic device. Accordingly, by varying the programming signal, the power supply can be programmed to provide output power to any one of several electronic devices having differing input power requirements.

Abstract: The electronic calibration equipment for verifying the high frequency characteristics of electronic test equipment, including oscilloscopes arid time interval analyzers is provided.

Abstract: 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 series to one another at a plurality of M−1 internal nodes. Each of the resistors in the stack has substantially the same value of RS ohms. The potentiometer further comprises a first variable resistance network coupled between one end of the resistor stack and the potentiometer's first main terminal, and a second variable resistance network coupled between the other end of the resistor stack and the potentiometer's second main terminal. The first variable resistance network has a variable resistance value R1 which varies between zero ohms and RP ohms. The second variable resistance network has a variable resistance value R2 which is maintained substantially at value of (RP−R1).

Abstract: 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. The percent reduction of overhead circuitry including the wiper transistors increases exponentially as the number of the taps required for the potentiometer increases.

Abstract: A progammable power supply for providing a regulated DC output power is disclosed. The power supply provides the output power to any one of a plurality of electronic devices adapted for receiving the output power at an operational voltage or an operational current. The power supply receives a programming signal to maintain the output power at the operational voltage or operational current associated with a particular selected electronic device. Accordingly, by varying the programming signal, the power supply can be programmed to provide output power to any one of several electronic devices having differing input power requirements.

Abstract: The voltage supply provides voltages to an electronic circuit requiring at least two different supply voltages. A plurality of standby supply voltages with different levels are obtained from the highest supply voltage with the aid of a voltage divider.

Abstract: An adjustable circuit for voltage division comprises a serial resistor Rn(n=1, 2 . . . n) symmetrically mapped, connected in series, and paired in parallel with a switch Sn or Sn′ apiece, wherein the switches Sn and Sn′ are oppositely operated, namely, when the former is turned “ON/OFF”, the latter is turned “OFF/ON” to thereby hold the current unchanged to obtain desired output voltage(s) by proper control of the switches and accordingly a valid portion of voltage-dividing resistor &Dgr;R′.

Abstract: 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 one another at a plurality of M−1 internal nodes. Each of the resistors in the stack has substantially the same value of RS ohms. The potentiometer further has a first variable resistance network coupled between one end of the resistor stack and the potentiometer's first main terminal, and a second variable resistance network coupled between the other end of the resistor stack and the potentiometer's second main terminal. The first variable resistance network has a variable resistance value R1 which varies between zero ohms and RP ohms. The second variable resistance network has a variable resistance value R2 which is maintained substantially at value of (RP−R1).