Patents by Inventor Panny Cai

Panny Cai 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).

  • Circuit and method for generating a bandgap reference voltage
    Patent number: 9568933
    Abstract: A bandgap reference voltage generator includes a bipolar assembly having a first resistor, a first branch and a second branch that is in parallel with the first branch. The first branch includes a first bipolar transistor with a base coupled to a fixed voltage. The second branch includes a second bipolar transistor with a base coupled to the fixed voltage and a second resistor coupled in series with the second bipolar transistor. A differential module is coupled to the first and second bipolar transistors and configured to balance the currents in the first and the second branches. The bandgap reference voltage is output at a node to which the first resistor is connected.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: February 14, 2017
    Assignees: STMicroelectronics R&D (Shanghai) Co. Ltd., STMicroelectronics Application GmbH
    Inventors: Ansgar Pottbaecker, Panny Cai
  • HS-CAN bus clock recovery using a tracking oscillator circuit
    Patent number: 9032239
    Abstract: A method for recovering a clock frequency of a CAN bus, the method including: receiving a data signal, wherein the data signal includes at least one state transition; detecting the state transition; and adjusting a frequency of a clocking signal generated by an oscillator circuit, wherein the frequency is adjusted when the state transition is detected and adjusting the frequency is for recovering the clock frequency of the CAN bus.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: May 12, 2015
    Assignee: STMicroelectronics R&D (Shanghai) Co. Ltd.
    Inventors: Panny Cai, Martin Haug
  • CIRCUIT AND METHOD FOR GENERATING A BANDGAP REFERENCE VOLTAGE
    Publication number: 20140070788
    Abstract: A bandgap reference voltage generator includes a bipolar assembly having a first resistor, a first branch and a second branch that is in parallel with the first branch. The first branch includes a first bipolar transistor with a base coupled to a fixed voltage. The second branch includes a second bipolar transistor with a base coupled to the fixed voltage and a second resistor coupled in series with the second bipolar transistor. A differential module is coupled to the first and second bipolar transistors and configured to balance the currents in the first and the second branches. The bandgap reference voltage is output at a node to which the first resistor is connected.
    Type: Application
    Filed: September 9, 2013
    Publication date: March 13, 2014
    Applicant: STMicroelectronics R&D (Shanghai) Co. Ltd.
    Inventors: Ansgar Pottbaecker, Panny Cai