Patents by Inventor Meimei Chang

Meimei Chang 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).

  • Frequency synthesizer and method for constructing the same
    Patent number: 7609096
    Abstract: A frequency synthesizer and a method for constructing the same by using the architecture of digital process frequency loop (DPFL) are disclosed. The DPFL frequency synthesizer with the DPFL architecture includes a reference frequency divider counter, an output divider counter, a processor, a memory, a digital to analog converter (DAC), and a voltage Control Oscillator (VCO). The method uses the processor to perform the signal processing to correct the output frequency of the VCO in the frequency domain. The memory stores the nonlinear characteristics of the VCO such that the synthesizer is completely controlled, no uncertain frequency being captured during process, and the frequency resolution of the synthesizer is programmable.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: October 27, 2009
    Inventors: Edward C. Chang, Deirdre McGlashan, Meimei Chang
  • Automatic Test Equipment (ATE) Realized Through Sharing Same Memory Space by Instruction Data and Vector Data
    Publication number: 20070192661
    Abstract: An improved Automatic Test Equipment (ATE) in which Instruction Memory and a Vector Memory are combined together into a tester pattern memory in order to share the same memory space. As such, reducing the memory, size, and cost of the Automatic Test Equipment.
    Type: Application
    Filed: October 18, 2006
    Publication date: August 16, 2007
    Inventors: Edward C. Chang, Meimei Chang, Deirdre McGlashan, Derek Chang