Patents by Inventor Anca PURDILA

Anca PURDILA 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).

  • Offset voltage trimming for operational amplifiers
    Patent number: 10924066
    Abstract: An operational amplifier is disclosed. The operational amplifier activates/couples either a first or a second differential pair of transistors to an input based on the input voltage. The first and second pair of transistors are each biased with a current having a first portion that is constant with temperature and a second portion that is proportional to temperature. By adjusting the ratios of the first and second portions, the transconductance of each differential pair may be made relatively constant with temperature. Each differential pair is coupled to a trim current source that is adjusted to reduce the voltage offset at each output. The resulting voltage offset for the operational amplifier is relatively constant over a range of input voltages and has temperature coefficient unaffected by the trimming process.
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: February 16, 2021
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Anca Purdila, Constantin Pasoi
  • OFFSET VOLTAGE TRIMMING FOR OPERATIONAL AMPLIFIERS
    Publication number: 20200119698
    Abstract: An operational amplifier is disclosed. The operational amplifier activates/couples either a first or a second differential pair of transistors to an input based on the input voltage. The first and second pair of transistors are each biased with a current having a first portion that is constant with temperature and a second portion that is proportional to temperature. By adjusting the ratios of the first and second portions, the transconductance of each differential pair may be made relatively constant with temperature. Each differential pair is coupled to a trim current source that is adjusted to reduce the voltage offset at each output. The resulting voltage offset for the operational amplifier is relatively constant over a range of input voltages and has temperature coefficient unaffected by the trimming process.
    Type: Application
    Filed: August 2, 2019
    Publication date: April 16, 2020
    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Anca PURDILA, Constantin PASOI