Patents by Inventor Lu M. Han

Lu M. Han 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).

  • High performance CMOS radio frequency receiver
    Patent number: 8045943
    Abstract: A high performance radio frequency receiver includes a low noise amplifier with large binary and stepped gain control range, controlled impedance, and enhanced blocker immunity, for amplifying and converting a radio frequency signal to a current; a pulse generator for generating in-phase and quadrature pulses; a crossover correction circuit and pulse shaper for controlling a crossover threshold of the pulses and interaction between in-phase and quadrature mixers; and a double balanced mixer for combining the RF signal with the pulses to generate an intermediate frequency or baseband zero intermediate frequency current-mode signal. The in-phase and quadrature pulses have a duty cycle of 20-35%. The intermediate frequency signal and second order harmonics may be filtered with a high frequency low pass filter and a current injected complex direct-coupled filter.
    Type: Grant
    Filed: January 29, 2008
    Date of Patent: October 25, 2011
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Daniel L. Kaczman, Mohammed S. Alam, David L. Cashen, Lu M. Han, Mohammed Rachedine, Manish N. Shah
  • HIGH PERFORMANCE CMOS RADIO FREQUENCY RECEIVER
    Publication number: 20090191833
    Abstract: A high performance radio frequency receiver includes a low noise amplifier with large binary and stepped gain control range, controlled impedance, and enhanced blocker immunity, for amplifying and converting a radio frequency signal to a current; a pulse generator for generating in-phase and quadrature pulses; a crossover correction circuit and pulse shaper for controlling a crossover threshold of the pulses and interaction between in-phase and quadrature mixers; and a double balanced mixer for combining the RF signal with the pulses to generate an intermediate frequency or baseband zero intermediate frequency current-mode signal. The in-phase and quadrature pulses have a duty cycle of 20-35%. The intermediate frequency signal and second order harmonics may be filtered with a high frequency low pass filter and a current injected complex direct-coupled filter.
    Type: Application
    Filed: January 29, 2008
    Publication date: July 30, 2009
    Inventors: Daniel L. Kaczman, Mohammed S. Alam, David L. Cashen, Lu M. Han, Mohammed Rachedine, Manish N. Shah