Abstract: An information handling system includes a DDR5 DIMM and a voltage regulator. The voltage regulator provides a voltage rail to the DDR5 DIMM. In a first mode, the voltage rail is based upon a pulse frequency modulation, and in a second mode, the voltage rail is based upon a forced continuous conduction mode). Selection of one of modes is based upon an input to the voltage regulator. When the information handling system is in a first state, the information handling system provides an input signal to the input to direct the voltage regulator to operate in the first state, and when the information handling system is in a second state associated with a sleep mode of the information handling system, the information handling system provides the first input signal to the first input of the voltage regulator to direct the voltage regulator to operate in the second state.

Abstract: A converter and a circuit device including the converter are disclosed. The converter includes an inductor including a first end and a second end, and a switching circuit connected to the inductor. The switching circuit includes a first switch to control a connection between the first end and a battery connected to the converter, a second switch to control a connection between the second end and a current output end configured to output a current generated through the inductor from the battery, a third switch to control a connection between the second end and a voltage output end configured to output a voltage generated from the battery, and a fourth switch to control a connection between the second end and a voltage input end configured to receive a voltage to charge the battery.

Abstract: An apparatus includes a plurality of control modules coupled to a multi-phase power converter having a plurality of power stage circuits correspondingly coupled to the plurality of control modules, where each control module includes: a first port coupled to a second port of a previous control module; a second port coupled to a first port of a next control module, and being configured to generate a transmission signal for the next control module; and where the transmission signal represents at least two types of information, and is configured to control the corresponding power stage circuit to operate sequentially.

Abstract: A bandgap module and a linear regulator are provided. The linear regulator includes the bandgap module and an error amplifier. The voltage supply voltage includes a bandgap circuit, a lowpass filter, and a start-up module. The voltage supply voltage generates a bandgap voltage. The lowpass filter filters the bandgap voltage and generates a reference voltage accordingly. The start-up module includes a first start-up circuit and a second start-up circuit. The bandgap voltage is increased to a predefined value when the bandgap module operates in a first phase. The bandgap voltage maintains at the predefined value when the bandgap module operates in a second phase. The second phase is after the first phase.

Abstract: An electronic device including: a reference voltage generator circuit to generate a reference voltage based on a first and second voltage, the reference voltage generator circuit including: a first current source to supply a first current to each of a first and second node; an amplifier to amplify a difference between the first voltage of the first node and the second voltage of the second node and to output a difference voltage corresponding to the amplified difference; a first bipolar junction transistor (BJT) connected to the first node; a first resistor connected to the second node; a second BJT connected between the first resistor and ground; a second resistor connected between the second node and ground; and a first transistor to be supplied with a second current from the first current source; and an adaptive cascode circuit to generate a bias voltage applied to a gate of the first transistor.

Abstract: An apparatus includes a plurality of control modules coupled to a multi-phase power converter having a plurality of power stage circuits correspondingly coupled to the plurality of control modules, where each control module includes: a first port coupled to a second port of a previous control module; a second port coupled to a first port of a next control module, and being configured to generate a transmission signal for the next control module; and where the transmission signal represents at least two types of information, and is configured to control the corresponding power stage circuit to operate sequentially.

Abstract: A controllable temperature coefficient bias (CTCB) circuit is disclosed. The CTCB circuit can provide a bias to an amplifier. The CTCB circuit includes a variable with temperature (VWT) circuit having a reference circuit and a control circuit. The control circuit has a control output, a first current control element and a second current control element. Each current control element has a “controllable” resistance. One of the two current control elements may have a relatively high temperature coefficient and another a relatively low temperature coefficient. A controllable resistance of one of the current control elements increases when the controllable resistance of the other current control element decreases. However, the “total resistance” of the current control circuit remains constant with a constant temperature. The VWT circuit has an output with a temperature coefficient that is determined by the relative amount of current that flows through each current control element of the control circuit.

Abstract: The present disclosure relates to single-ended-to-differential amplifiers and radio frequency receivers. One example single-ended-to-differential amplifier includes a first inverting amplifier, a second inverting amplifier, and a third inverting amplifier. Both an input end of the first inverting amplifier and an input end of the second inverting amplifier are coupled to an input end of the single-ended-to-differential amplifier, an output end of the first inverting amplifier is coupled to an input end of the third inverting amplifier, an output end of the second inverting amplifier is coupled to a first output end of the single-ended-to-differential amplifier, and an output end of the third inverting amplifier is coupled to a second output end of the single-ended-to-differential amplifier. An impedance element is coupled between the input end of the first inverting amplifier and the output end of the first inverting amplifier.

Abstract: A method for operating an electric power converter and an electric power converter configured to convert DC power into AC power supplied to a three-phase AC network, conclude, during the converting, that a single-phase tripping has started in the three-phase AC network connected to the three-phase output of the converter, and after the concluding that the single-phase tripping has started in the three-phase AC network, control an active current in the three-phase output of the converter such that a negative sequence voltage in the three-phase output of the converter remains at or below a predetermined level, wherein the converter is configured to perform the controlling until concluding that the single-phase tripping has ended in the three-phase AC network.

Abstract: A device includes a memory array and a sense circuit coupled with the memory array. The sense circuit includes a sense node coupled with a data line of the memory array. A first sensing path includes a first transistor having a first gate coupled with the sense node. A second sensing path includes a second transistor having a second gate coupled with the sense node. A first threshold voltage of the first transistors differs from a second threshold voltage of the second transistor by a threshold voltage gap.

Abstract: A controllable temperature coefficient bias (CTCB) circuit is disclosed. The CTCB circuit can provide a bias to an amplifier. The CTCB circuit includes a variable with temperature (VWT) circuit having a reference circuit and a control circuit. The control circuit has a control output, a first current control element and a second current control element. Each current control element has a “controllable” resistance. One of the two current control elements may have a relatively high temperature coefficient and another a relatively low temperature coefficient. A controllable resistance of one of the current control elements increases when the controllable resistance of the other current control element decreases. However, the “total resistance” of the current control circuit remains constant with a constant temperature. The VWT circuit has an output with a temperature coefficient that is determined by the relative amount of current that flows through each current control element of the control circuit.

Abstract: A system may include a power converter configured to convert a source voltage from a power source to an output voltage at an output capacitor at an output of the power converter, a dual-mode power converter electrically coupled to the power converter, the dual-mode power converter having a plurality of switches and a power inductor, an energy storage element electrically coupled to the dual-mode power converter, and control circuity configured to, when the output voltage is below a threshold voltage magnitude, control the plurality of switches to operate the dual-mode power converter as a buck converter in order to transfer energy from the energy storage element to the output capacitor via an electrical current through the power inductor.

Abstract: A driving method of display device for a display device capable of reducing flicker due to refresh rate variation includes: determining whether a processor of the display device is generating a vertical blank interval of an image signal, wherein said vertical blank interval is next to a last frame data period thereof, and the last frame data period is for a last frame to be displayed by a display panel; and activating a data line of the display panel with a balancing voltage related to data of a line of the last frame when the processor is generating the vertical blank interval, wherein a plurality of sub-pixels of the display panel connects to the data line, the data of the line of the last frame are sequentially transmitted to the plurality of sub-pixels in the last frame data period for displaying the last frame. Said display device is also disclosed.

Abstract: A multi-input single output power system for outputting an output voltage on an output node. It includes a first integrated circuit (IC) converter device and a second IC converter device. The first IC converter device has a first pin to receive a first input voltage, a second pin to output the output voltage, and a first power unit coupled between the first pin and the second pin. The second IC converter device has a first pin to receive a second input voltage, a second pin to output the output voltage, a second power unit coupled between the first pin of the second IC converter device and the second pin of the second IC converter device, and a third pin. The third pin receives an external phase shedding control signal to determine whether to stop the second power unit from providing power to the output node.

Abstract: An on-die voltage regulator (VR) is provided that can deliver much higher conversion efficiency than the traditional solution (e.g., FIVR, LDO) during the standby mode of a system-on-chip (SOC), and it can save the power consumption significantly, during the connected standby mode. The VR operates as a switched capacitor VR under the low load current condition that is common during the standby mode of the SOC, while it automatically switches to the digital linear VR operation to handle a sudden high load current condition at the exit from the standby condition. A digital proportional-integral-derivative (PID) controller or a digital proportional-derivative-averaging (PDA) controller is used to achieve a very low power operation with stability and robustness. As such, the hybrid VR achieves much higher conversion efficiency than the linear voltage regulator (LVR) for low load current condition (e.g., lower than 500 mA).

Abstract: A peak-buck peak-boost current mode control structure and scheme for a synchronous four-switch and non-synchronous two-switch buck-boost regulators sense input and output voltages to smoothly transition between buck mode, buck-boost mode, and boost mode for high power efficiency and low output ripples. With the inductor current sensing, the control scheme achieves the best performance in continuous conduction and discontinuous condition mode operations.

Abstract: Communication network architectures, systems, and methods for supporting a network of mobile nodes may include a method for using a first health score for a first mobile access point (MAP) in a network, comprising generating the first health score using a plurality of features related to the first MAP. The first health score may be used for one or more of scheduling maintenance, triggering an alarm, and monitoring the network.

Abstract: This disclosure describes techniques to control switching operations of a switching regulator. The disclosure includes a system comprising a switching regulator configured to use an inductor to generate an output voltage signal from a. pulse-width-modulated (PWM) signal by controlling one or more switches of the switching regulator that vary charging operations of the inductor; transient handling circuitry coupled to receive a feedback voltage based on the output voltage signal and configured to generate first and second current signals that represent a difference between the feedback voltage and a reference voltage; and control circuitry configured to generate the PWM signal based on the first and second current signals such that the first current signal changes a frequency of an oscillator used to generate the PWM signal and the second current signal changes a bandwidth of a feedback loop associated with the switching regulator.

Abstract: A power supply system includes a voltage application source, and a switched mode power supply having an output coupled to the voltage application source through a first path and through a second path different from the first path. A first node is coupled to the output of the switched mode power supply, the switched mode power supply being configured to couple the first node to the voltage application source through the first path in a first operating mode and through the second path in a different second operating mode. A digital regulator is coupled to the first node. A digital circuit is coupled to an output of the digital regulator. An analog regulator is coupled to the first node and an analog circuit coupled to an output of the analog regulator.

Abstract: A control device of a multi-phase converter having N converter circuits connected in parallel includes: a determination unit configured to determine each share ratio of the N converter circuits to unevenly share input current to the multi-phase converter among the N converter circuits such that a conversion efficiency indicating a ratio of output power from the multi-phase converter with respect to input power to the multi-phase converter is higher in the case where the input current is unevenly shared by the N converter circuits compared to the case where the input current is evenly shared by the N converter circuits when the number of driven converter circuits is one or more and N?1 or less and the start condition is satisfied; and a diagnosis unit configured to diagnose an abnormality of the N converter circuits when the N converter circuits are driven in accordance with the determined share ratios.

Abstract: Techniques are presented herein to operate a light fixture as in an emergency mode in order to verify that the light emitted by the light fixture when operated in the emergency mode complies with emergency operating policies, as well as to detect failures. The light emitted by the light fixture in emergency mode may be measured and adjusted to optimize the runtime of the light fixture in the emergency mode. The light fixture is connected to a lighting control system via a control network which supplies electrical power to charge an onboard battery of a light fixture and to operate the light fixture. The light fixture may be caused to operate in the emergency lighting mode when a main electrical power supply is interrupted or when performances of the light fixture and of the onboard battery are tested.

Abstract: A circuit includes an output current circuit that employs a regulated voltage to provide an output voltage to drive a load current through an output load resistor. A load resistance sensor (LRS) senses the resistance of the output load resistor based on the output voltage and the load current. A controller provides a sense voltage control command to set the regulated voltage to an initial sense voltage during a sense mode. The initial sense voltage adjusts the output voltage of the output current circuit and enables the LRS to sense the resistance of the output load resistor at a given setting of the load current. The controller provides a clamp control command based on the sensed resistance of the output load resistor to set the regulated voltage to a fixed regulated voltage during an operation mode. The fixed regulated voltage enables the output current circuit to supply a predetermined maximum load current to the output load resistor at a predetermined minimum setting of the output voltage.

Abstract: A system may include a switch, a multiple stage voltage converter, and a regulation circuit. The switch may generate a pre-regulation signal based on an input signal. The multiple stage voltage converter may generate an output signal based on the input signal using a clock. The regulation circuit may generate a regulation signal based on the output signal and may generate a clock reference based on at least one of the pre-regulation signal and the regulation signal. The regulation circuit may generate the clock based on at least one of the pre-regulation signal, the regulation signal, and the clock reference and determine whether a voltage level of the regulation signal is within a range. If the voltage level of the regulation signal is within the range, the regulation circuit may generate a switch signal. The switch may adjust a voltage level of the pre-regulation signal based on the switch signal.

Abstract: An apparatus includes a first lateral diffusion field effect transistor (LDFET) having a first threshold voltage and that includes a first gate electrode, a first drain contact, a first source contact, and a first electrically conductive shield plate separated from the first gate electrode and the first source contact by a first interlayer dielectric. A second LDFET of the apparatus has a second threshold voltage and includes a second gate electrode, a second drain contact, and a second source contact. The second source contact is electrically connected to the first source contact of the first LDFET. A control circuit of the apparatus is electrically coupled to the first electrically conductive shield plate and is configured to apply to the first electrically conductive shield plate a first gate bias voltage of a first level to set the first threshold voltage of the first LDFET to a first desired threshold voltage.

Abstract: Provided is a method and system that includes a direct current solid state power controller that includes a plurality of switching devices connected in parallel for performing switching, one or more main transient voltage suppressors (TVSs) to perform voltage clamping, a plurality of parasitic inductances each connected in series with a switching device of the plurality of switching devices, and a plurality of local TVSs each connected in parallel with a series connection of a switching device and at least one parasitic inductor of the plurality of parasitic inductances, to dissipate energy stored within the at least one parasitic inductor of the plurality of parasitic inductances.

Abstract: A width of a voltage pulse signal is directly proportional to a difference between first and second resistances in a pulse generator. The voltage pulse signal is generated with a ramp signal, two reference voltages, and two comparators. The first reference voltage is generated with the first resistance and a first current, and the second reference voltage is generated with the second resistance and a second current. The first comparator produces a first comparator output in response to the first reference voltage and the ramp signal, and the second comparator produces a second comparator output in response to the second reference voltage and the ramp signal. A logic circuitry generates the voltage pulse signal in response to the two comparator outputs.

Abstract: An electrical system includes: 1) a buck converter; 2) a battery coupled to an input of the buck converter; and 3) a load coupled to an output of the buck converter. The buck converter includes a high-side switch, a low-side switch, and regulation loop circuitry coupled to the high-side switch and the low-side switch. The regulation loop circuitry includes a comparator with preamplifier gain adjustment circuitry configured to adjust a preamplifier gain of the comparator based on an overdrive voltage.

Abstract: A current reference circuit includes a native metal oxide semiconductor field effect transistor (MOSFET). The native MOSFET includes a source terminal coupled to ground. The current reference circuit also includes a transistor and an amplifier circuit. The transistor includes a first terminal coupled to a drain terminal of the native MOSFET, a second terminal coupled to a power supply rail, and a third terminal coupled to the drain terminal of the native MOSFET. The amplifier circuit includes an input terminal coupled to the drain terminal of the native MOSFET, and an output terminal coupled to a gate terminal of the native MOSFET.

Abstract: Disclosed herein are circuits, devices and methods that address challenges associated with power amplifier systems. A power amplifier system includes two or more fast error amplifiers coupled to corresponding power amplifiers. The fast error amplifiers are configured to generate envelope tracking signals based on a signal envelope, the envelope tracking signals modifying a DC-DC regulated voltage from a DC-DC converter to more efficiently operate the power amplifiers. By splitting the envelope tracking between two or more fast error amplifiers and amplification between corresponding two or more power amplifiers, the power, frequency or bandwidth, linearity, signal-to-noise ratio, efficiency, or the like of the power amplifier system can be improved. Wireless communications configurations with such power amplifier systems can provide uplink carrier aggregation and/or cellular signals based on standards and protocols that require increased bandwidth and/or power.

Abstract: The present invention relates to an apparatus including a self-regulating current source, which utilizes a switching regulator to provide high efficiency power conversion and a high-side current monitor, but instead of driving the feedback input with a voltage divider to set the output voltage, the self-regulating current source utilizes a high-side current sense resistor with an operational amplifier optimized for current sensing, to drive the feedback input to the switching regulator, thereby creating a self-regulating constant current source. By adjusting the gain of the operational amplifier, the user can directly set the optimized current needed for using the apparatus in a variety of deployment devices, including satellite and pyrotechnic applications.

Abstract: The present disclosure provides a short-circuit protection apparatus and method. The short-circuit protection apparatus includes a current detection circuit, a control circuit, and a voltage detection circuit. The current detection circuit detects an output current of an output circuit and outputs a current detection signal when the detected current is greater than a preset current. The control circuit receives the current detection signal and controls the output circuit to be turned off The voltage detection circuit detects an output voltage of the output circuit. When the output voltage is not in the preset voltage range, the output voltage is detected continuously When the output voltage is in the preset voltage range, the control circuit receives the voltage detection signal for controlling the output circuit.

Abstract: An organic light-emitting diode (OLED) drive power device and OLED television, OLED drive power device comprising power board connected to motherboard and OLED screen logic board, power board having power supply circuit, first conversion module, second conversion module, changeover switch and power factor correction (PFC) circuit thereon; after powered, power supply circuit starts PFC circuit to output high-voltage direct current (HVDC) according to on-off signal output by motherboard, first conversion module converts HVDC into first voltage and second voltage to power motherboard, and first voltage is converted to power OLED screen logic board; after preset time period, HVDC is converted to power OLED screen logic board to light OLED screen. Redesigning architecture of power board eliminates need for standby circuit and streamlines circuits, meets power output stability and timing requirements of OLED, reduces power board size, reduces power cost and benefits OLED popularization.

Abstract: A linear voltage regulator includes a series-pass element electrically coupled between an input node and an output node, current sense circuitry configured to generate a current sense signal representing at least magnitude of current flowing through the series-pass element, and control circuitry. The control circuitry is configured to control the series-pass element according to at least (a) the current sense signal and (b) a voltage sense signal representing magnitude of an output voltage, to clamp the magnitude of the output voltage to a maximum value, where the output voltage is a voltage at the output node, such that the magnitude of the output voltage decreases with increasing magnitude of current flowing through the series-pass element.

Abstract: A power stage in an electronic fuse circuit is driven by controller. The controller includes a first comparator set for output voltage control and a second comparator set for output current control. Each comparator set includes at least one comparator having a reference input, a feedback input, and one or more outputs. A driver circuit includes output terminals for driving the power stage. The driver circuit includes a switch that is selectively activated in response to outputs from the first and second comparator sets to clamp the voltage across the output terminals of the driver circuit. The clamp operation is made in response to feedback input to either of the first and second comparator sets having exceeded a certain reference.

Abstract: A multiplier circuit can be fabricated within an integrated circuit and can draw a product output node to a voltage proportional to a product of first and second binary numbers received at two sets of inputs. The multiplier circuit includes a set of scaled capacitors, each capacitor of the set connected to an output of a multiplexor and to a local product output node. Each multiplexor is connected to the output of a multiplexor configured to generate an analog voltage in proportion to the value of the first binary number. Each scaled capacitor has a capacitance proportional to a significance of a respective bit of the second binary number. The multiplier circuit includes a reference capacitor connected to ground and the product output node, and a reset circuit configured to draw, in response to a RESET signal, the product output node to ground.

Abstract: A multi-synchronization power supply and an ultrasound system with the same are disclosed. The multi-synchronization power supply includes a microprocessor configured to receive frequency information indicative of a plurality of frequencies and to output a control signal based on the frequency information; a clock signal generating unit configured to receive a reference synchronization clock signal and to generate a plurality of synchronization clock signals corresponding to the plurality of frequencies by frequency-dividing the reference synchronization clock signal based on the control signal; and a plurality of DC-DC converters configured to receive the plurality of synchronization clock signals and a reference DC voltage, and to generate a plurality of DC voltages from the reference DC voltage based on the plurality of synchronization clock signals.

Abstract: Circuit techniques control multiple regulator circuits. Regulator circuits are configured to time share voltage control circuitry. The voltage control circuitry may include multiple sets of switches to selectively couple a voltage control circuit with a selected voltage regulation loop of one of the regulators.

Abstract: Disclosed herein are circuits, devices and methods that address challenges associated with power amplifier systems. A power amplifier system includes two or more fast error amplifiers coupled to corresponding power amplifiers. The fast error amplifiers are configured to generate envelope tracking signals based on a signal envelope, the envelope tracking signals modifying a DC-DC regulated voltage from a DC-DC converter to more efficiently operate the power amplifiers. By splitting the envelope tracking between two or more fast error amplifiers and amplification between corresponding two or more power amplifiers, the power, frequency or bandwidth, linearity, signal-to-noise ratio, efficiency, or the like of the power amplifier system can be improved. Wireless communications configurations with such power amplifier systems can provide uplink carrier aggregation and/or cellular signals based on standards and protocols that require increased bandwidth and/or power.

Abstract: A power interface system for reducing power variations includes multiple control circuits configured to control a plurality of switching regulators operating at different frequencies to provide a shared output power to a load. Each control circuit receives a power variation signal resulting from a power variation in the shared output power of the plurality of switching regulators, separates a respective frequency component from multiple frequency components of the power variation signal, and controls, based on the separated respective frequency component, a respective switching regulator of the plurality of switching regulators to source current to, or sink current from, the shared output power until the shared output power reaches a threshold level.

Abstract: Circuits, devices, and method for bypassing voltage regulation in voltage regulators. A voltage regulator may include a duty cycle component configured to determine whether a duty cycle of the voltage regulator is greater than a threshold duty cycle. The voltage regulator may also include a first sensing component configured to determine whether an output voltage of the voltage regulator is less than a first threshold voltage. The voltage regulator may further include a regulating component, coupled to the duty cycle component and the first sensing component, the regulating component configured to pass an input voltage to the output of the voltage regulator based on a first determination that the duty cycle is greater than the threshold duty cycle and a second determination that the output voltage of the voltage regulator is less than the first threshold voltage.

Abstract: Provided is a power supply circuit including a series regulator step-down power circuit, a charge pump step-up power circuit, and a voltage selection circuit to which a voltage of an input terminal and a voltage of an output terminal are supplied and configured to output a higher voltage from the supplied voltages. A connection point of a first resistor and a second resistor which are connected between the output terminal and a ground terminal is connected to an input of a differential amplifier circuit. An output of the differential amplifier circuit is connected to a gate terminal of an output transistor via a first switch. An output of the voltage selection circuit is connected to the gate terminal of the output transistor via a second switch. The output of the voltage selection circuit is connected to a substrate electrode of the output transistor.

Abstract: Systems, apparatuses, and methods for efficiently generating a stable output voltage for one or more components are described. In various embodiments, current sensing circuitry within a power converter includes one or more current mirrors in addition to at least a first resistor, a second resistor, a switch and a bias current source. The sizes of these latter components scales the sensing current output of the current sensing circuitry from a value of an inductor current flowing through the low pass filter output of the power converter. In addition, the sizes generate an offset which maintains the sensing current as a positive value even when the inductor current becomes a negative value. The boosted sensing current makes a zero detection function and a protection function for the power converter relatively simple with current comparisons.

Abstract: A multiple-phase parallelable constant on time (COT) buck controller, a first phase containing a first memory bit and a second phase containing a second memory bit. The COT buck controller includes a first converter comprising a first constant TON generator configured to sense and deliver a first TON request when the first memory bit is in a logic one state, and a second converter connected in parallel with the first converter, the second converter comprising a second constant TON generator configured to sense and deliver a second TON request when the second memory bit is in the logic one state, only one of the first memory bit and the second memory bit being in the logic one state thus generating activity in a daisy chain ring where each of the first converter and the second converter senses and delivers a corresponding TON request in a sequential manner.

Abstract: Disclosed herein are circuits, devices and methods that address challenges associated with power amplifier systems. A power amplifier system includes two or more fast error amplifiers coupled to corresponding power amplifiers. The fast error amplifiers are configured to generate envelope tracking signals based on a signal envelope, the envelope tracking signals modifying a DC-DC regulated voltage from a DC-DC converter to more efficiently operate the power amplifiers. By splitting the envelope tracking between two or more fast error amplifiers and amplification between corresponding two or more power amplifiers, the power, frequency or bandwidth, linearity, signal-to-noise ratio, efficiency, or the like of the power amplifier system can be improved. Wireless communications configurations with such power amplifier systems can provide uplink carrier aggregation and/or cellular signals based on standards and protocols that require increased bandwidth and/or power.

Abstract: A voltage regulator includes an input terminal, an output terminal, a control circuitry, a buck mode switching converter, and a low dropout regulator circuit. The buck mode switching converter is arranged to convert a voltage signal received at the input terminal to a first voltage signal at the output terminal responsive to a first predetermined signal output from the control circuitry. The buck mode switching converter includes an electronically controlled switch in communication with an energy storage element. The low dropout regulator circuit is coupled between the input terminal and the output terminal and includes a linear circuit and is arranged to control a voltage drop across the linear circuit so as to provide a second voltage signal at the output terminal responsive to a second predetermined signal output from the control circuitry.

Abstract: A power circuit for regulating power transfer includes: a power converter circuit having an input and an output and arranged to be connected between a power supply and a load to regulate power transfer therebetween; an input capacitor connected across the input of the power converter circuit; a series pass element arranged to be connected between the power supply and the input capacitor; and a control circuit, operably connected with the series pass element and the power converter circuit, for controlling operation of the series pass element. The power circuit further includes an input capacitor power control circuit operably connected with the input capacitor and arranged to provide power to the input capacitor to facilitate charging of the input capacitor when a voltage across the series pass element is detected to be above a voltage threshold as a result of an increase in a voltage of the power supply.

Abstract: An example two-path symmetrical-output adjustable power supply is provided, including a switching power supply module, a positive adjustment module, a negative adjustment module and a first operational amplifier. The switching power supply module is coupled to a DC power supply and the first operational amplifier and configured to output a positive voltage and a negative voltage in common-ground and equal in absolute value according to a feedback control based on a reference voltage and the output voltage of the first operational amplifier. The positive adjustment module is coupled to the positive voltage and configured to output a positive output voltage of the adjustable power supply according to a feedback control based on a given voltage and the positive output voltage. The negative adjustment module is coupled to the negative voltage and configured to output a negative output voltage of the adjustable power supply according to the positive output voltage.

Abstract: The present invention breaks up the frequency bands which can be filtered by a simple low-loss band-pass or low pass filter. The second harmonic frequency is reduced by use of a non-linear clipper element which controls the driving waveform symmetry and can reduce the harmonics by as much as 5-15 db which makes the filter much simpler and allows the amplifier to remain wide-band. The output waveform from the amplifier is symmetrical or nearly symmetrical.

Abstract: A reference voltage generation circuit may be provided. The reference voltage generation circuit may be configured to generate a reference voltage according to a voltage set code. The reference voltage generation circuit may include a voltage level stabilizer. The reference voltage generation circuit may be configured to deactivate the voltage level stabilizer when a level of the reference voltage changes based on the voltage set code.

Abstract: One example includes a transconductor system. The system includes a first transconductance amplifier that generates a control current in response to a first input voltage. The system also includes a second transconductance amplifier that generates an output signal in response to a second input voltage. The system further includes an intermediate amplifier that generates a control voltage in response to the control current and a third input voltage. The control voltage can be provided to the first and second transconductance amplifiers to set a transconductance of each of the first and second transconductance amplifiers to be approximately equal.