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Carlmikael Zetterling - One of the best experts on this subject based on the ideXlab platform.

  • 500 c high current Linear Voltage Regulator in 4h sic bjt technology
    IEEE Electron Device Letters, 2018
    Co-Authors: Saleh Kargarrazi, Hossein Elahipanah, Saul Rodriguez, Carlmikael Zetterling
    Abstract:

    This letter reports on a fully integrated 2- ${A}$ Linear Voltage Regulator operational in a wide temperature range from 25 °C up to 500 °C fabricated in 4H-SiC technology. The circuit provides a stable output Voltage with less than 1% variation in the entire temperature range. This letter demonstrates the first power supply solution providing both high-temperature (up to 500 °C) and high-load driving capabilities (up to 2 ${A}$ ).

  • 500 c bipolar sic Linear Voltage Regulator
    IEEE Transactions on Electron Devices, 2015
    Co-Authors: Saleh Kargarrazi, Luigia Lanni, S Saggini, Ana Rusu, Carlmikael Zetterling
    Abstract:

    In this paper, we demonstrate a fully integrated Linear Voltage Regulator in silicon carbide NPN bipolar transistor technology, operational from 25 °C up to 500 °C. For 15-mA load current, this Regulator provides a stable output Voltage with <2% variation in the temperature range 25 °C–500 °C. For both line and load regulations, degradation of 50% from 25 °C to 300 °C and improvement of 50% from 300 °C to 500 °C are observed. The transient response measurements of the Regulator show robust behavior in the temperature range 25 °C–500 °C.

Saleh Kargarrazi - One of the best experts on this subject based on the ideXlab platform.

  • 500 c high current Linear Voltage Regulator in 4h sic bjt technology
    IEEE Electron Device Letters, 2018
    Co-Authors: Saleh Kargarrazi, Hossein Elahipanah, Saul Rodriguez, Carlmikael Zetterling
    Abstract:

    This letter reports on a fully integrated 2- ${A}$ Linear Voltage Regulator operational in a wide temperature range from 25 °C up to 500 °C fabricated in 4H-SiC technology. The circuit provides a stable output Voltage with less than 1% variation in the entire temperature range. This letter demonstrates the first power supply solution providing both high-temperature (up to 500 °C) and high-load driving capabilities (up to 2 ${A}$ ).

  • 500 c bipolar sic Linear Voltage Regulator
    IEEE Transactions on Electron Devices, 2015
    Co-Authors: Saleh Kargarrazi, Luigia Lanni, S Saggini, Ana Rusu, Carlmikael Zetterling
    Abstract:

    In this paper, we demonstrate a fully integrated Linear Voltage Regulator in silicon carbide NPN bipolar transistor technology, operational from 25 °C up to 500 °C. For 15-mA load current, this Regulator provides a stable output Voltage with <2% variation in the temperature range 25 °C–500 °C. For both line and load regulations, degradation of 50% from 25 °C to 300 °C and improvement of 50% from 300 °C to 500 °C are observed. The transient response measurements of the Regulator show robust behavior in the temperature range 25 °C–500 °C.

H A Mantooth - One of the best experts on this subject based on the ideXlab platform.

  • a sic cmos Linear Voltage Regulator for high temperature applications
    IEEE Transactions on Power Electronics, 2014
    Co-Authors: Robert Murphree, Sajib Roy, Shamim Ahmed, Matthew Barlow, Ashfaqur Rahman, Anthony Matthew Francis, Jim Holmes, H A Mantooth
    Abstract:

    The first SiC integrated circuit Linear Voltage Regulator is reported. The Voltage Regulator uses a 20-V supply and generates an output of 15 V, adjustable down to 10 V. It was designed for loads of up to 2 A over a temperature range of 25-225 °C. It was, however, successfully tested up to 300 °C. The Voltage Regulator demonstrated load regulations of 1.49% and 9% for a 2-A load at temperatures of 25 and 300 °C, respectively. However, the load regulation is less than 2% up to 300 °C for a 1-A load. The line regulation with a 2-A load at 25 and 300 °C was 17 and 296 mV/V, respectively. The Regulator was fabricated in a Cree 4H-SiC 2-μm experimental process and consists of 1000, 32/2-μm NMOS depletion MOSFETs as the pass device, an integrated error amplifier with enhancement MOSFETs, and resistor loads, and uses external feedback and compensation networks to ensure operational integrity. It was designed to be integrated with high-Voltage vertical power MOSFETs on the same SiC substrate. It also serves as a guide to future attempts for Voltage regulation in any type of integrated SiC circuitry.

Martínez García Herminio - One of the best experts on this subject based on the ideXlab platform.

  • Capacitorless DC/DC Regulator as a candidate topology for photovoltaic solar
    Cambridge Scholars Publishing, 2020
    Co-Authors: Martínez García Herminio, García Vílchez Encarnación
    Abstract:

    Linear-assisted DC/DC Regulators (or Linear-switching hybrid DC/DC Regulators) consist of a Linear Voltage Regulator (classic NPN/nMOS topologies or PNP/pMOS low-dropout structures) connected in parallel with a switching DC/DC converter. This chapter describes the analysis and implementation of a hybrid DC/DC power Regulator. The proposed topology consists of a series Linear Voltage Regulator in parallel with a switching step-down converter. This topology sees a small ripple in the output Voltage, a fast response to load variations, and high efficiency at high load current conditions. It is a good candidate for energy processing in photovoltaic solar facilities. In order to control these hybrid structures, different strategies exist that allow the fixing of the switching frequency as a function of some parameters of the Linear Regulator. In hybrid structures, there is not a classical feedback loop, as found in DC/DC converters, but they are still feedback systems. Therefore, small-signal analysis is important in ensuring the stability of the implemented power supply system. From the proposed analysis, we can deduce the critical components causing instability in the hybrid Regulator and also understand how to improve the final design.Postprint (author's final draft

  • Low drop-out Voltage Regulator as a candidate topology for photovoltaic solar facilities
    Cambridge Scholars Publishing, 2020
    Co-Authors: Martínez García Herminio, García Vílchez Encarnación
    Abstract:

    This chapter presents a design for a 4.5-V, 450-mA low drop-out (LDO) Linear Voltage Regulator based on a two-stage cascode operational transconductance amplifier (OTA) as an error amplifier for photovoltaic solar DC-DC regulation. The aforementioned two-stage OTA is designed with a cascode current mirroring technique to boost the output impedance. The proposed OTA has a DC gain of 101 dB under no load condition.Postprint (published version

  • Comparative aspects of control strategies for hybrid DC/DC Regulators with variable-switching frequency
    Cambridge Scholars Publishing, 2020
    Co-Authors: Martínez García Herminio, García Vílchez Encarnación
    Abstract:

    Linear-assisted DC/DC Regulators (or Linear-switching hybrid DC/DC Regulators) consist of a Linear Voltage Regulator (classic NPN/nMOS topologies or PNP/pMOS low-dropout structures) connected in parallel with a switching DC/DC converter. They are a good candidate for energy processing in photovoltaic solar facilities. In order to control these hybrid structures, different strategies exist that allow the switching frequency to be fixed as a function of certain parameters of the Linear Regulator. This chapter compares two control strategies that, although they can be applied to the same circuit structure with a Linear-assisted Regulator, are different. The first one, as reported in the existing literature, completely cancels out the average current through the Linear Regulator in a steady state to achieve a reduction in losses. Thus, the efficiency of the whole system increases and almost equals one with a standalone switching converter.Postprint (published version

  • Approach to the implementation and modeling of LDO–assisted DC-DC Voltage Regulators
    'Institute of Electrical and Electronics Engineers (IEEE)', 2018
    Co-Authors: Martínez García Herminio
    Abstract:

    This paper presents the design of an LDO-assisted DC-DC Voltage Regulator in Cadence Virtuoso® based on a 350-nm CMOS technology. This kind of Voltage Regulator consists of a switching converter together with a classic or LDO (low dropout) Linear Voltage Regulator. While the Linear Regulator provides the constant output Voltage, the switching converter conducts nearly all the current provided to the output load, and keeping the Regulator current close to zero where the higher efficiency is achieved. In addition, this paper shows the modeling in Matlab/Simulink. Notice that, this modeling is mandatory in order to predict and assure the stability of the circuit. In addition, it will help to improve the transient response and performance of the circuit

  • Approach to the implementation and modeling of LDO–assisted DC-DC Voltage Regulators
    'Institute of Electrical and Electronics Engineers (IEEE)', 2018
    Co-Authors: Martínez García Herminio
    Abstract:

    This paper presents the design of an LDO-assisted DC-DC Voltage Regulator in Cadence Virtuoso® based on a 350-nm CMOS technology. This kind of Voltage Regulator consists of a switching converter together with a classic or LDO (low dropout) Linear Voltage Regulator. While the Linear Regulator provides the constant output Voltage, the switching converter conducts nearly all the current provided to the output load, and keeping the Regulator current close to zero where the higher efficiency is achieved. In addition, this paper shows the modeling in Matlab/Simulink. Notice that, this modeling is mandatory in order to predict and assure the stability of the circuit. In addition, it will help to improve the transient response and performance of the circuit.Postprint (published version

Robert Murphree - One of the best experts on this subject based on the ideXlab platform.

  • a sic cmos Linear Voltage Regulator for high temperature applications
    IEEE Transactions on Power Electronics, 2014
    Co-Authors: Robert Murphree, Sajib Roy, Shamim Ahmed, Matthew Barlow, Ashfaqur Rahman, Anthony Matthew Francis, Jim Holmes, H A Mantooth
    Abstract:

    The first SiC integrated circuit Linear Voltage Regulator is reported. The Voltage Regulator uses a 20-V supply and generates an output of 15 V, adjustable down to 10 V. It was designed for loads of up to 2 A over a temperature range of 25-225 °C. It was, however, successfully tested up to 300 °C. The Voltage Regulator demonstrated load regulations of 1.49% and 9% for a 2-A load at temperatures of 25 and 300 °C, respectively. However, the load regulation is less than 2% up to 300 °C for a 1-A load. The line regulation with a 2-A load at 25 and 300 °C was 17 and 296 mV/V, respectively. The Regulator was fabricated in a Cree 4H-SiC 2-μm experimental process and consists of 1000, 32/2-μm NMOS depletion MOSFETs as the pass device, an integrated error amplifier with enhancement MOSFETs, and resistor loads, and uses external feedback and compensation networks to ensure operational integrity. It was designed to be integrated with high-Voltage vertical power MOSFETs on the same SiC substrate. It also serves as a guide to future attempts for Voltage regulation in any type of integrated SiC circuitry.