Patents by Inventor Stefan Marinca

Stefan Marinca has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20180059707
    Abstract: The present disclosure relates to a PTAT voltage reference circuit and a temperature independent voltage reference circuit in which the effect of transistor base currents on the circuit output is compensated for. This is achieved by a pair of compensation resistors. The base current from one of the pair of transistors is used to increase the voltage drop across one of the compensation resistors. The base current from the other of the pair of transistors is used to decrease the voltage drop across another of the compensation resistors, by an equal amount. The compensation resistors are connected in series with the resistor which reflects the difference in base-emitter voltage (?VBE). The circuit output is measured across the series connected resistors. As such, the base currents are compensated for at the output.
    Type: Application
    Filed: August 26, 2016
    Publication date: March 1, 2018
    Inventor: Stefan Marinca
  • Patent number: 9851739
    Abstract: Circuits for generating a PTAT voltage as a base-emitter voltage difference between a pair of bipolar transistors. The circuits may form unit cells in a cascading voltage reference circuit that increases the PTAT voltage with each subsequent stage. The bipolar transistors are controlled using a biasing arrangement that includes an MOS transistor connected to a current mirror that provides the base current for the bipolar transistors. A voltage reference is formed by combining a PTAT voltage and a CTAT voltage at the last stage. The voltage reference may be obtained from the voltage at an emitter of one of the bipolar transistors in the last stage.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: December 26, 2017
    Assignee: ANALOG DEVICES, INC.
    Inventor: Stefan Marinca
  • Patent number: 9811107
    Abstract: A bias current generators that may be implemented in low power environments is described. The current generator can be implemented without using resistors and may be used to generate reference currents and voltages. It may also be used to generate voltage references where the output of the circuit is to at least a first order temperature independent.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: November 7, 2017
    Assignee: Analog Devices Global
    Inventor: Stefan Marinca
  • Publication number: 20170255221
    Abstract: The present disclosure relates to a method and apparatus for generating a voltage reference. More particularly the present disclosure relates to a methodology and circuitry configured to provide an output signal that combines a proportional to absolute temperature component with a complimentary to absolute temperature component to generate a stable output which is not temperature dependent.
    Type: Application
    Filed: March 20, 2017
    Publication date: September 7, 2017
    Inventors: Stefan Marinca, Gabriel Banarie
  • Patent number: 9658637
    Abstract: A proportional to absolute temperature (PTAT) circuit is provided. By judiciously combining circuit elements into two or more cell it is possible to effectively dump bias current into impedance resistive element of a first cell from other cells of the circuit. As a result the circuit as a whole can operate with smaller resistive elements and therefore occupy less area when implemented in silicon. It is also possible to reduce the supply current that is required for providing specific output currents or voltages.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: May 23, 2017
    Assignee: Analog Devices Global
    Inventor: Stefan Marinca
  • Patent number: 9600014
    Abstract: The present disclosure relates to a method and apparatus for generating a voltage reference. More particularly the present disclosure relates to a methodology and circuitry configured to provide an output signal that combines a proportional to absolute temperature component with a complimentary to absolute temperature component to generate a stable output which is not temperature dependent.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: March 21, 2017
    Assignee: Analog Devices Global
    Inventors: Stefan Marinca, Gabriel Banarie
  • Patent number: 9600015
    Abstract: Early effects are intrinsically present in bipolar junction transistors (BJTs). Described are examples of complimentary to absolute temperature (CTAT) and proportional to absolute temperature (PTAT) cells that reduce errors associated with the Early effects that would otherwise be present.
    Type: Grant
    Filed: November 3, 2014
    Date of Patent: March 21, 2017
    Assignee: Analog Devices Global
    Inventor: Stefan Marinca
  • Publication number: 20170003704
    Abstract: A bias current generators that may be implemented in low power environments is described. The current generator can be implemented without using resistors and may be used to generate reference currents and voltages. It may also be used to generate voltage references where the output of the circuit is to at least a first order temperature independent.
    Type: Application
    Filed: July 1, 2015
    Publication date: January 5, 2017
    Inventor: Stefan MARINCA
  • Patent number: 9448579
    Abstract: Circuits and method for providing voltage reference circuits that include low drift over time and lower operating voltages are provided. Generally, it is desirable that a reference circuit provide an accurate and precise reference over time. The voltage reference circuits described can provide for good long term stability, operation at lower voltages than prior designs, consistent output voltage with reduced variability due to process changes and mismatches, low noise in the reference voltage, and other advantages.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: September 20, 2016
    Assignee: Analog Devices Global
    Inventor: Stefan Marinca
  • Publication number: 20160126935
    Abstract: Early effects are intrinsically present in bipolar junction transistors (BJTs). Described are examples of complimentary to absolute temperature (CTAT) and proportional to absolute temperature (PTAT) cells that reduce errors associated with the Early effects that would otherwise be present.
    Type: Application
    Filed: November 3, 2014
    Publication date: May 5, 2016
    Applicant: ANALOG DEVICES GLOBAL
    Inventor: Stefan MARINCA
  • Patent number: 9323275
    Abstract: A proportional to absolute temperature, PTAT, circuit is provided. By judiciously combining circuit elements it is possible to generate a voltage at an output node of the circuit that is temperature dependent. Such a PTAT circuit can be used as a temperature sensor or can be combined with other temperature dependent circuits to provide a voltage reference.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: April 26, 2016
    Assignee: ANALOG DEVICES GLOBAL
    Inventor: Stefan Marinca
  • Publication number: 20160077541
    Abstract: Circuits for generating a PTAT voltage as a base-emitter voltage difference between a pair of bipolar transistors. The circuits may form unit cells in a cascading voltage reference circuit that increases the PTAT voltage with each subsequent stage. The bipolar transistors are controlled using a biasing arrangement that includes an MOS transistor connected to a current mirror that provides the base current for the bipolar transistors. A voltage reference is formed by combining a PTAT voltage and a CTAT voltage at the last stage. The voltage reference may be obtained from the voltage at an emitter of one of the bipolar transistors in the last stage.
    Type: Application
    Filed: November 30, 2015
    Publication date: March 17, 2016
    Inventor: Stefan MARINCA
  • Patent number: 9218015
    Abstract: Circuits for generating a PTAT voltage as a base-emitter voltage difference between a pair of bipolar transistors. The circuits may form unit cells in a cascading voltage reference circuit that increases the PTAT voltage with each subsequent stage. The bipolar transistors are controlled using a biasing arrangement that includes an MOS transistor connected to a current mirror that provides the base current for the bipolar transistors. A voltage reference is formed by combining a PTAT voltage and a CTAT voltage at the last stage. The voltage reference may be obtained from the voltage at an emitter of one of the bipolar transistors in the last stage.
    Type: Grant
    Filed: October 10, 2012
    Date of Patent: December 22, 2015
    Assignee: ANALOG DEVICES, INC.
    Inventor: Stefan Marinca
  • Publication number: 20150323950
    Abstract: The present disclosure relates to a method and apparatus for generating a voltage reference. More particularly the present disclosure relates to a methodology and circuitry configured to provide an output signal that combines a proportional to absolute temperature component with a complimentary to absolute temperature component to generate a stable output which is not temperature dependent.
    Type: Application
    Filed: May 7, 2014
    Publication date: November 12, 2015
    Applicant: ANALOG DEVICES TECHNOLOGY
    Inventors: Stefan MARINCA, Gabriel BANARIE
  • Publication number: 20150234414
    Abstract: A proportional to absolute temperature (PTAT) circuit is provided. By judiciously combining circuit elements into two or more cell it is possible to effectively dump bias current into impedance resistive element of a first cell from other cells of the circuit. As a result the circuit as a whole can operate with smaller resistive elements and therefore occupy less area when implemented in silicon. It is also possible to reduce the supply current that is required for providing specific output currents or voltages.
    Type: Application
    Filed: February 18, 2014
    Publication date: August 20, 2015
    Applicant: ANALOG DEVICES TECHNOLOGY
    Inventor: Stefan Marinca
  • Publication number: 20150177771
    Abstract: Circuits and method for providing voltage reference circuits that include low drift over time and lower operating voltages are provided. Generally, it is desirable that a reference circuit provide an accurate and precise reference over time. The voltage reference circuits described can provide for good long term stability, operation at lower voltages than prior designs, consistent output voltage with reduced variability due to process changes and mismatches, low noise in the reference voltage, and other advantages.
    Type: Application
    Filed: December 20, 2013
    Publication date: June 25, 2015
    Applicant: ANALOG DEVICES TECHNOLOGY
    Inventor: Stefan MARINCA
  • Publication number: 20150160680
    Abstract: A proportional to absolute temperature, PTAT, circuit is provided. By judiciously combining circuit elements it is possible to generate a voltage at an output node of the circuit that is temperature dependent. Such a PTAT circuit can be used as a temperature sensor or can be combined with other temperature dependent circuits to provide a voltage reference.
    Type: Application
    Filed: December 11, 2013
    Publication date: June 11, 2015
    Applicant: Analog Devices Technology
    Inventor: Stefan MARINCA
  • Patent number: 8717090
    Abstract: A system provides for a voltage reference having a small temperature coefficient spread. The voltage reference includes a PTAT voltage trimming circuit that accurately trims the CTAT voltage component of the bandgap type voltage reference. The voltage trimming circuit includes two bipolar transistors that are biased by biasing currents to create a specific base-emitter voltage difference at an output. The bias currents can be digitally trimmed by a current digital-to-analog (“DAC”) converter. This may result in the ability to trim the voltage reference at a single temperature, without the need to trim at two or more temperatures.
    Type: Grant
    Filed: July 24, 2012
    Date of Patent: May 6, 2014
    Assignee: Analog Devices, Inc.
    Inventors: Stefan Marinca, Denis M. O'Connor
  • Patent number: 8710912
    Abstract: A system and method are provided for a more accurate bandgap voltage reference wherein the first and second order errors are corrected simultaneously. By using the components included in the correction of the first order error, the second order errors are corrected, advantageously providing less process variability.
    Type: Grant
    Filed: November 24, 2008
    Date of Patent: April 29, 2014
    Assignee: Analog Device, Inc.
    Inventor: Stefan Marinca
  • Publication number: 20140028376
    Abstract: A system provides for a voltage reference having a small temperature coefficient spread. The voltage reference includes a PTAT voltage trimming circuit that accurately trims the CTAT voltage component of the bandgap type voltage reference. The voltage trimming circuit includes two bipolar transistors that are biased by biasing currents to create a specific base-emitter voltage difference at an output. The bias currents can be digitally trimmed by a current digital-to-analog (“DAC”) converter. This may result in the ability to trim the voltage reference at a single temperature, without the need to trim at two or more temperatures.
    Type: Application
    Filed: July 24, 2012
    Publication date: January 30, 2014
    Applicant: ANALOG DEVICES, INC.
    Inventors: Stefan Marinca, Denis M. O'Connor