Patents by Inventor Sai Srujana Vuppala

Sai Srujana Vuppala 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).

  • Hybrid autozeroing and chopping offset cancellation for switched-capacitor circuits
    Patent number: 11012043
    Abstract: A system has an output and receives an input signal. An operational amplifier has an input, an output and an offset at the input. A switched capacitor network samples the input signal at a switched capacitor frequency. An autozeroing capacitor connected to the input of the operational amplifier captures the offset during an offset capture interval according to an autozeroing frequency. Chopping and autozeroing switches, connected between the autozeroing capacitor and the switched capacitor network, chop the sampled input signal according to a chopping frequency and autozero the captured offset according to the autozeroing frequency. De-chopping switches, connected between the output of the operational amplifier and the output of the system, operate on the output of the operational amplifier at the chopping frequency to chop the autozeroed captured offset and de-chop the chopped sampled input signal processed by the operational amplifier.
    Type: Grant
    Filed: August 19, 2019
    Date of Patent: May 18, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Ramin Zanbaghi, Eric Kimball, Sai Srujana Vuppala
  • HYBRID AUTOZEROING AND CHOPPING OFFSET CANCELLATION FOR SWITCHED-CAPACITOR CIRCUITS
    Publication number: 20210058046
    Abstract: A system has an output and receives an input signal. An operational amplifier has an input, an output and an offset at the input. A switched capacitor network samples the input signal at a switched capacitor frequency. An autozeroing capacitor connected to the input of the operational amplifier captures the offset during an offset capture interval according to an autozeroing frequency. Chopping and autozeroing switches, connected between the autozeroing capacitor and the switched capacitor network, chop the sampled input signal according to a chopping frequency and autozero the captured offset according to the autozeroing frequency. De-chopping switches, connected between the output of the operational amplifier and the output of the system, operate on the output of the operational amplifier at the chopping frequency to chop the autozeroed captured offset and de-chop the chopped sampled input signal processed by the operational amplifier.
    Type: Application
    Filed: August 19, 2019
    Publication date: February 25, 2021
    Inventors: Ramin Zanbaghi, Eric Kimball, Sai Srujana Vuppala