Abstract: A voltage regulator for a merchandise display security device provides an appropriate operating voltage through a power cable electrically connected between an alarm sensor and an item of merchandise. The voltage regulator utilizes a feedback signal from a power conversion chip and data from a microprocessor look-up table to adjust the input power to the merchandise. The look-up table stores appropriate operating voltage requirements for each power cable used for different types and brands of merchandise. The type and brand of merchandise is identified by the resistance of the power cable and the feedback signal is modified continuously to maintain power to the merchandise at an appropriate operating voltage.

Abstract: Various systems and methods are provided for minimizing an inrush current to a load after a voltage sag in a power voltage. In one embodiment, a method is provided comprising the steps of applying a power voltage to a load, and detecting a sag in the power voltage during steady-state operation of the load. The method includes the steps of adding an impedance to the load upon detection of the sag in the power voltage, and removing the impedance from the load when the power voltage has reached a predefined point in the power voltage cycle after the power voltage has returned to a nominal voltage.

Abstract: Various systems and methods are provided for minimizing an inrush current to a load after a voltage sag in a power voltage. In one embodiment, a method is provided comprising the steps of applying a power voltage to a load, and detecting a sag in the power voltage during steady-state operation of the load. The method includes the steps of adding an impedance to the load upon detection of the sag in the power voltage, and removing the impedance from the load when the power voltage has reached a predefined point in the power voltage cycle after the power voltage has returned to a nominal voltage.

Abstract: Various systems and methods are provided for minimizing an inrush current to a load after a voltage sag in a power voltage. In one embodiment, a method is provided comprising the steps of applying a power voltage to a load, and detecting a sag in the power voltage during steady-state operation of the load. The method includes the steps of adding an impedance to the load upon detection of the sag in the power voltage, and removing the impedance from the load when the power voltage has reached a predefined point in the power voltage cycle after the power voltage has returned to a nominal voltage.

Abstract: Embodiments are provided that include a memory die, memory devices, and methods, such as those comprising a voltage generator, including an output voltage and an adjustment circuit configured to cause adjustment of the output voltage based on a latch signal. Further one such method includes applying an input voltage to an input of a voltage generator, adjusting the input voltage to an adjusted voltage, comparing the adjusted voltage to a reference voltage, generating trim data based on the comparison and storing the trim data.

Abstract: A semiconductor device includes a booster circuit and a detector. The booster circuit is configured to boost an input voltage and output an output voltage, and the detector is configured to output the output voltage, which is output from the booster circuit, and control the booster circuit to generate a plurality of different voltages in accordance with an operating mode.

Abstract: A power control device for the load element includes a variable capacitance element connected in parallel with the load element, and a control unit controlling a capacitance of the variable capacitance element and maintaining a degree of a voltage fluctuation due to a parasitic inductance of the line such that the degree of the voltage fluctuation is not more than a certain degree.

Abstract: A voltage regulator with an adaptive bandwidth, including a first buffer chain, a voltage generating unit, a trimming capacitor unit, a second buffer chain, and a control unit. The first buffer chain delays a clock signal using an external voltage as a supply voltage. The voltage generating unit generates a regulated voltage on the basis a reference voltage. The trimming capacitor unit controls a load capacitance of the voltage generating unit. The second buffer chain delays the clock signal using the regulated voltage as a supply voltage. The control unit adjusts the load capacitance by detecting a delay difference of clocks output from the first and second buffer chains.

Abstract: An output voltage detecting circuit includes a conducting structure, a voltage regulator, a first resistor and a second resistor. The conducting structure includes a power output return terminal, a first contact and a second contact. A compensating voltage is generated between the first and second contacts when an output current flows through the first and second contacts. The voltage regulator adjusts a first current according to a voltage across a first circuit terminal and the ground terminal of the voltage regulator, thereby generating a detecting signal according to the first current. An output voltage across the positive power output terminal and the power output return terminal is subject to voltage division by the first and second resistors to generate a divided voltage. The voltage across the first circuit terminal and the ground terminal of the voltage regulator is equal to a difference between the divided voltage and the compensating voltage.

Abstract: A DC-DC converter includes a chip including an error amplifier and a pulse width modulator (PWM) having an input connected to an output of the error amplifier, and an inductor driven by said PWM in series with an output node (VOUT) of the converter, wherein a load current flows through the inductor. VOUT is fed back through a network including a feedback resistor (RFB) to an inverting input of the error amplifier. A circuit for sensing the load current includes a first operational amplifier, a sense resistor on the chip having resistance RSENSE coupled to an inverting input of the first amplifier; wherein a sense current related to the load current flows through the sense resistor, a dependent current source provides an output current to supply the sense current. A reference resistor is disposed on the chip having a resistance RREFERENCE which is a fixed multiple of RSENSE. A set resistor is provided having a resistance RSET.

Abstract: An induction motor control device includes an inverter circuit for driving an induction motor by outputting a command voltage, a current detector for detecting an output current, a magnetic flux estimation observer for generating an estimated magnetic flux, an estimated current, and a phase command for the motor using the command voltage and the output current, a primary angular speed estimator for estimating a primary angular speed using the estimated magnetic flux, a slip compensator for calculating a slip angular frequency using the output current, a first angular speed estimator for estimating a first angular speed using the primary angular speed and the output current, a second angular speed estimator for estimating a second angular speed using the output current, the estimated magnetic flux, and the estimated current, and a resistance estimator for estimating a secondary resistance value of the motor using the first and second angular speeds.

Abstract: A method and apparatus control power consumption in a portable terminal by cutting the direct current (DC) bias voltage. The power consumption control apparatus of a portable terminal is connected to the processors. The apparatus includes an oscillator, an inverter, and a DC bias voltage cutting unit. The oscillator creates signals to control the portable terminal to be operated in a sleep mode or a standby mode. The inverter receives the signals from the oscillator and outputs inverted signals to the processors. The DC bias voltage cutting unit cuts a DC bias voltage that is derived on a feedback line between an input port and an output port of the inverter, from the signals created by the oscillator. The apparatus and method can allow the portable terminal to reduce the power consumption when the processors are driven.

Abstract: Unlike buck converter and tapped-inductor buck converters, which use only inductive energy transfer, the present invention employs the capacitive energy transfer in addition to inductive energy transfer. The hybrid transformer performs the double duty simultaneously: transfers the input inductive energy storage to the load through a taped-inductor turns ratio n but also transfers the resonant capacitor discharge current to the load during OFF-time interval amplified by turns ratio m of the hybrid transformer. Despite the presence of the resonant inductor current during the OFF-time interval, the output voltage is neither dependent on resonant component values nor on the load current as in conventional resonant converters but depends on duty ratio D and turns ratio n of the hybrid transformer. Hence a simple regulation of output voltage is achieved using duty ratio control.

Abstract: A voltage generator with current limiting generates a voltage to be fed to a load of which load current is limited. The voltage generator includes an operational amplifier; an output resistance connected between an output terminal of the operational amplifier and a load connecting terminal; a feedback resistor connected between the load connecting terminal and an inverting input terminal of the operational amplifier; a first clamper connected between the output terminal of the operational amplifier and the inverting input terminal of the operational amplifier; and a second clamper connected between the load connecting terminal and a non-inverting input terminal of the operational amplifier and configured with diodes. The first clamper generates a predetermined constant voltage, limits a current flowing into the output resistance, and varies the generated constant voltage. The first clamper has a predetermined abrupt current-voltage characteristic.

Abstract: A system comprises a voltage regulator operably coupled to an external component, a voltage regulator reset circuit and at least one functional element supplied with a voltage by the voltage regulator. The voltage regulator reset circuit is arranged to repetitively reset the voltage regulator upon disconnection of the external component.

Abstract: An adaptive power converter controller coupled to a load and a power converter circuit is provided. The adaptive power converter controller has an adaptive voltage sensing unit and a converting control circuit. The adaptive voltage sensing unit is coupled to the load and output a voltage sensing signal according to a load current and a load voltage from the load. The converting control circuit is utilized for receiving the voltage sensing signal and comparing the voltage level of the voltage sensing signal with a current sensing signal, which is corresponding solely to the load current, so as to decide whether the power converter circuit is controlled according to the voltage sensing signal or the current sensing signal.

Abstract: It is desired for semiconductor devices to reduce an inrush current and an overshoot. According to the voltage regulator circuit of the present invention, when a power supply is turned on, a switch SW1 is turned on in response to a control signal CTR1, a switch SW2 is turned off, and a reference voltage Vref is input to the first (+IN) and second (?IN) inputs of a differential amplifier AMP1 as a common voltage. When a common voltage is supplied to the first (+IN) and second (?IN) inputs, the current I flows into a smoothing capacitor C1 from the high-voltage power supply (VDD) via the differential amplifier AMP1 is regulated to be small. Namely, an inrush current can be reduced. Further, according to the voltage regulator circuit 30 of the present invention, the increase of the output voltage Vout from the differential amplifier AMP1 is relaxed so that the overshoot can be suppressed.

Abstract: A voltage regulator may comprise a regulator output configured to provide a regulated voltage, which may be controlled by an error amplifier based on the regulated voltage and a reference voltage. The error amplifier may control a source-follower stage to mirror a multiple of the current flowing in the source-follower stage into an internal pass device. A voltage developed by the mirror current may control an external pass device configured to deliver the load current into the regulator output. A first resistor may be configured to decouple a load capacitor coupled between the regulator output and reference ground, when the load current is below a specified value. A second resistor may be configured to create a bias current in the internal pass device even when the external pass device is close to cut-off region. A third resistor may be configured to counter the effects of negative impedance at the control terminal of the external pass device caused by the current-gain of the external pass device.

Abstract: An input signal is input via a first resistor to an inverting input terminal of an operational amplifier. A second resistor is provided on a feedback path between an output terminal and the inverting input terminal of the operational amplifier. A control voltage Vcnt output from the operational amplifier is input to a VCO. A frequency divider frequency-divides an output signal Sout of the VCO. A phase comparator compares an output signal from the frequency divider with a reference clock signal and outputs a voltage according to a phase difference. A loop filter removes a high-frequency component of an output voltage Vcp of the phase comparator and outputs the voltage to a non-inverting input terminal of the operational amplifier.

Abstract: Disclosed herein is an information processing terminal including: a resonance circuit unit configured to have a resonance frequency varying linearly in accordance with a control signal so as to receive data and power from a reader/writer in noncontact fashion at the resonance frequency; a maximum received voltage setting unit configured to output a reference voltage for defining a maximum received voltage to be output by the resonance circuit unit; a control signal generation unit configured to generate the control signal in accordance with the received voltage and the reference voltage; and a transmit-receive processing section configured to operate on the received voltage to process the data; wherein the received voltage is not in excess of a predetermined level.

Abstract: A device for measuring the current flowing through a power transistor of a voltage regulator, the voltage regulator having an input voltage and providing a regulated output voltage and the power transistor coupled between the input and output voltages. The measuring device includes a further transistor adapted to mirror a portion of the current flowing through the power transistor, the further transistor and the power transistor have a first non-drivable terminal in common that is coupled to the input voltage. The measuring device also includes a circuit block to connect the second non-drivable terminals of the power and the further transistor and to provide an output current equal to the portion of the current flowing through the first transistor; the measuring device further including a circuit adapted to detect the output current of said circuit block.

Abstract: An over current protection circuit and a power converter using the same. The over current protection circuit includes a soft start cell and an operational amplifier. The soft start cell outputs a soft start signal according to a direct current (DC) level, and the soft start signal increases progressively to the DC level in a soft start interval. The operational amplifier outputs an over current signal to a feedback control circuit according to the soft start signal and an inductance current of a switching converter so that a duty cycle of a driving signal from the feedback control circuit increases progressively in the soft start interval.

Abstract: The present invention discloses an adaptive voltage position DC-DC regulator and the method thereof, the regulator comprising a main circuit and a control circuit which includes a sensing unit, a feedback unit, a comparing unit, a PWM generator and a driver. The regulator realizes the adaptive voltage position control with simple internal circuit and fewer pins.

Abstract: A boost DC/DC converter has a voltage dividing circuit connected between the output terminal and the ground, that outputs a divided voltage obtained by dividing the output voltage; a reference voltage generating circuit that generates a reference voltage based on the input voltage; an error amplifier that outputs a first signal corresponding to the difference between the divided voltage and the reference voltage; a feedforward circuit that detects the input voltage and outputs a second signal corresponding to a current inversely proportional to the input voltage; a multiplier that multiples the first signal by the second signal and outputs a third signal obtained; and a control circuit that outputs, based on the third signal, a control signal for controlling on/off of the switching transistor so that the divided voltage is equal to the reference voltage.

Abstract: A multi-phase power converter with constant on-time control includes a plurality of channels to convert an input voltage into an output voltage, and each of the channels is driven by a control signal. When all channel currents of the channels are balanced, each of the control signals remains a constant on-time. When the channel currents are imbalanced, the on-times of the control signals are modulated according to the difference between each channel current and a target value for current balance between the channels.

Abstract: A voltage reference module of an integrated circuit device includes a current source to apply a current to a set of voltage cells, thereby generating a voltage drop across each cell. The voltage cells are configured such that the individual voltage drop associated with each cell in response to the application of the current is relatively stable over a temperature range. The voltage reference module generates a voltage based on the voltage drops across the voltage cells, and therefore the generated voltage is also stable over the temperature range. Bypass switches can be connected across each voltage cell whereby the switches can be individually opened and closed to include or exclude cells in generation of the reference voltage. In an embodiment, the switches are set during a trimming process for the integrated circuit device so that the voltage reference module provides a specified voltage.

Abstract: Various embodiments include a method for feeding DC power to an amplifier module for a pulsed load, comprising: providing current pulses from a DC power supply; charging a capacitor configuration in the amplifier module; providing an output voltage via a voltage regulated power supply; feeding current pulses to said load from said capacitor configuration, determining an output current (Iout) pulse configuration appearing during feeding the load from said configuration; providing a pulsed input current (Iin) from said DC power supply based upon the determined output pulsed current; limiting the maximum current level of the input current pulses to a pre-determined level by, inter alia, a control and pulse shaping circuit (8) to be substantially lower compared to the peak current of said output current pulses. Various embodiments include a device for feeding DC power.

Abstract: A DC-DC conversion device is provided. The DC-DC conversion device includes a control signal generator, a conversion module and a comparison module. The control signal generator generates a control signal according to a delay signal. The conversion module is coupled to the control signal generator to convert an input voltage to an output voltage according to the control signal. The comparison module is coupled to the control signal generator and conversion module to compare the output voltage with a reference voltage and output the delay signal according to the comparison result, an enable signal and a clock signal.

Abstract: In one embodiment a switched capacitor dc-dc converter uses the load current to assist in determining a supply configuration to use to form the output voltage.

Abstract: A power supply control device includes a boost type power supply controller boosting an input voltage, a step down power supply controller reducing an output of the boost type power supply controller to output an output voltage, a first control loop including the boost type power supply controller, and a second control loop including the step down power supply controller, wherein the output voltage is controlled by the second control loop during a predetermined period beginning after the power supply control device enters a power-on state, and wherein the output voltage is controlled by the first control loop after the predetermined period passes.

Abstract: A controller for functionally controlling a domestic appliance, such as a dryer, comprises a monitoring device that monitors the correct functioning of the domestic appliance. The domestic appliance has at least one monitoring connection connected to at least one associated evaluation node within a power circuit of the domestic appliance, and an evaluation device evaluates a signal produced at the at least one monitoring connection, for monitoring the correct functioning of the domestic appliance.

Abstract: A voltage source providing a constant reference voltage, independent of load variations at an output terminal. The effective impedance (looking-in impedance) at the output terminal is designed to be independent of frequency of the signals at the output terminal. In an embodiment, the resistance of one of two parallel impedance paths constituting the effective impedance is made equal to the resistance of the other path, and the time constants of both paths are made equal. As a result, the effective impedance is made independent of frequency, and the strength of the reference voltage is maintained constant without exhibiting ringing, DC droop, etc., despite load variations.

Abstract: The present invention discloses a voltage regulator which generates a control signal to convert an input voltage to an output voltage, the voltage regulator comprising: a regulator module for generating the control signal according to comparison between a signal representative of the output voltage and a signal representative of a reference voltage; and an amplifier for generating a first index signal by amplifying a difference between the signal representative of the output voltage and the signal representative of the reference voltage.

Abstract: A reference voltage generating circuit includes a constant current source circuit connected with a power supply voltage and configured to output a reference current to an output node based on the power supply voltage. A current-voltage converting circuit is connected the output node and generates a reference voltage to the output node based on the reference current. A first voltage adjusting circuit is connected with the output node and is configured to adjust dependence of the reference voltage on the power supply voltage in a positive direction. A second voltage adjusting circuit is connected with the output node and is configured to adjust dependence of the reference voltage on the power supply voltage in a negative direction.

Abstract: An information handling system has a power supply using a DC-to-DC buck converter. The DC-to-DC buck converter maintains continuous mode of operation over a wide range of output currents by adding more inductance to the buck converter circuit when the load current is below a certain value(s). A sensing circuit may determine load current and at the certain value(s) more inductance (increased inductance value) may be added to the buck converter circuit so as to main a continuous mode of operation. When the load current increases above the certain value, the extra inductance may be removed (inductance value decreased). Thus, the buck converter may operate most efficiently and remain in the continuous operation mode for a wider range of load currents.

Abstract: Embodiments are provided that include a memory die, memory devices, and methods, such as those comprising a voltage generator, including an output voltage and an adjustment circuit configured to cause adjustment of the output voltage based on a latch signal. Further one such method includes applying an input voltage to an input of a voltage generator, adjusting the input voltage to an adjusted voltage, comparing the adjusted voltage to a reference voltage, generating trim data based on the comparison and storing the trim data.

Abstract: A control circuit for use in a power supply is disclosed. An example control circuit according to aspects of the present invention includes a signal generator coupled to generate an output signal to control switching of a power switch to be coupled to the control circuit. A feedback circuit is coupled to receive a feedback signal, which is representative of an output of the power supply during a feedback portion of an off time of the power switch. The signal generator generates the output signal in response to the feedback circuit to control a fraction of the feedback portion of the off time of the power switch that the feedback signal is above a threshold and another fraction of the feedback portion of the off time of the power switch that the feedback signal is below the threshold.

Abstract: The inventive circuitry on a semiconductor chip includes a first functional element having a first electronic functional-element parameter that exhibits a dependence relating to the mechanical stress present in the semiconductor circuit chip in accordance with a first functional-element stress influence function. The first functional element provides a first output signal based on the first electronic functional-element parameter and mechanical stress. A second functional element has a second electronic functional-element parameter that exhibits a dependence in relation to the mechanical stress present in the semiconductor circuit chip in accordance with a second functional-element stress influence function. The second functional element is configured to provide a second output signal based on the second electronic functional-element parameter and the mechanical stress.

Abstract: An untethered device is configured to inductively couple to a source device, which generates a varying magnetic field having a fixed frequency. The untethered device includes a tunable resonant circuit having a resonance frequency and configured to generate a supply voltage for the untethered device in response to the varying magnetic field. The untethered device further includes a frequency control circuit coupled to the tunable resonant circuit and configured to produce a control signal using signals developed within the tunable resonant circuit. The control signal is useable to adjust the resonance frequency of the tunable resonant circuit to the fixed frequency of the source device.

Abstract: A semiconductor chip includes a first functional element having a first electronic functional-element parameter exhibiting a dependence relating to the mechanical stress present in the semiconductor circuit chip, and being configured to provide a first output signal, a second functional element having a second electronic functional-element parameter exhibiting a dependence in relation to the mechanical stress present in the semiconductor circuit chip, and being configured to provide a second output signal in dependence on the second electronic functional-element parameter and the mechanical stress, and a combination means for combining the first and second output signals to obtain a resulting output signal exhibiting a predefined dependence on the mechanical stress present in the semiconductor circuit chip, the first and second functional elements being integrated on the semiconductor circuit chip and arranged, geometrically, such that that the first and second functional-element stress influence functions ar

Abstract: A voltage regulator for regulating a voltage of a direct current source is disclosed. The voltage regulator includes a current-limiting circuit and a power-storing circuit. The current-limiting circuit is used for limiting an output current of the direct current source. The power-storing circuit is used for storing output power of the direct current source.

Abstract: A power accumulating unit of a power supply system includes a first switch section configured to achieve a first voltage output state in which an output voltage is substantially equal to a first motor driving voltage and a second switch section configured to achieve a second voltage output state in which the output voltage is substantially equal to a second motor driving voltage that is higher than the first motor driving voltage. A voltage switching control part is configured to perform a voltage switching control to switch between the first motor driving voltage and the second motor driving voltage by alternately operating the first and second switch sections to repeatedly switch between the first voltage output state and the second voltage output state.

Abstract: An apparatus to prevent overheating of a print head. The apparatus includes a temperature sensing unit, a voltage dividing unit, and a comparing unit. The temperature sensing unit includes a first resistor having a low temperature coefficient of resistance (TCR) and a second resistor having a higher TCR than the first resistor, and outputs a voltage between the first resistor and the second resistor. The first resistor and the second resistor are connected in series. The voltage dividing unit divides a reference voltage and outputs the divided reference voltage. The comparing unit compares the output voltage of the temperature sensing unit and the output voltage of the voltage dividing unit and outputs a signal to stop an operation of the print head according to the comparison result.

Abstract: A DC-DC converter for converting an input voltage and generating an output voltage. The DC-DC converter includes an adjustment resistor. A control circuit generates a control signal and includes an external terminal to which the adjustment resistor is externally connected. A switching transistor is connected to the control circuit and turned on or off in accordance with the control signal. The control circuit includes an oscillator that generates an oscillation signal. The control circuit generates the control signal based on the oscillation signal and a signal that is in accordance with an output voltage or output current of the DC-DC converter. The oscillator monitors a first amount of current flowing through the external terminal of the control circuit and generates the oscillation signal in a cycle that is accordance with the monitoring result.

Abstract: A compensation signal, which derives the mechanical stress, which acts on an integrated semiconductor circuit, from two partial compensation signals, which are generated by semiconductor elements with different stress characteristics, can be determined in more detail when the temperature dependence of a ratio of the partial compensation signals is also considered, wherein particularly a deviation of the ratio of the partial compensation signal to an ideal ratio is considered. Thereby, the rise in accuracy of the stress determination results from determining a deviation of the partial compensation signals, on which the stress determination is based, from a nominal behavior in a stress-free state, so that the deviation of the nominal behavior, which can be based, for example, on a variation of the process parameters in a production process of a semiconductor circuit, can also be considered, in addition to the known temperature behavior.

Abstract: A controller for an electric article includes a voltage-stabilizing circuit for supplying voltage stable DC power, a microprocessor, a temperature-detecting circuit, a protecting circuit, a control circuit, and a switch circuit. The temperature-detecting circuit includes several comparators commonly connected to a temperature range switch. The protecting circuit includes a comparator that detects a pre-set highest heating temperature and that is connected to the voltage stable DC power and a voltage-detecting circuit of the voltage stable DC power. The comparator of the protecting circuit is further connected to a voltage-dividing end of a thermistor connected to a temperature-detecting wire. The control circuit is connected to the microprocessor and an output of the comparator of the protecting circuit. The switch circuit is connected to an output of the voltage stable DC power and the control circuit, thereby controlling conduction or cutting off DC power supply to the electric article.

Abstract: 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-voltage sensor is operably coupled to sense an output voltage of the digitally-controlled linear regulator to produce a sensed output voltage. The comparator module is operably coupled to compare the sensed output voltage with a reference voltage at a predetermined clock rate to produce a digital regulation signal. The quantization module is operably coupled to quantize the digital regulation signal to produce a quantized regulation signal. The impedance switching network is operably coupled to convert a source voltage into the output voltage of the digitally-controlled linear regulator based on the quantized regulation signal.

Abstract: A DC/DC converter according to the present invention includes first and second transformers, each including a primary winding and a secondary winding, the primary winding including first and second windings, a first diode connected to both ends of a series circuit including the DC power supply, a first switch, and the first winding of the first transformer, a second diode connected to both ends of a series circuit including the DC power supply, a second switch, and the first winding of the second transformer, a first series circuit connected to both ends of the first diode, the first series circuit including the second winding of the first transformer and a smoothing capacitor, a second series circuit connected to both ends of the second diode, the second series circuit including the second winding of the second transformer and the smoothing capacitor, a reactor connected to both ends of a series circuit including the secondary winding of the first transformer and the secondary winding of the second transform

Abstract: An arrangement is disclosed to automatically match the resonant frequency of a series resonant circuit to an imposed operating frequency. A series resonant circuit is used to store or modulate magnetic energy or to generate high voltages. The circuit includes a capacitive element in series with an inductive element and voltage driving source. The capacitive element includes a base capacitance in parallel with a switch circuit that is in series with a trim capacitance. The switch circuit regulates the timing and direction of current through the trim capacitance. The capacitance of the capacitive element may be tightly controlled so that the resonant frequency may be closely regulated. A controller regulates the operation of the switch circuit and the voltage driving source as a function of sensed current through the resonant circuit and the driving frequency and amplitude to be matched.

Abstract: A power supply feed-forward compensation technique using power consumption hints. One embodiment includes a power estimator to generate a power consumption hint that indicates a power consumption level of a component. A transfer function compensation circuit generates a power supply adjustment signal as a function of the power consumption hint and a power transfer function to the component.