Patents by Inventor Zhen-Chuan Liu

Zhen-Chuan Liu 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).

  • Tunable low noise amplifier and current-reused mixer for a low power RF application
    Patent number: 6850753
    Abstract: A radio frequency front-end receiver includes a single stage low noise amplifier connected with a resistor array and a capacitor array, and a Gilbert-type mixer connected with a PMOS transconductance stage, an inductor and a serially connected current source. The resistor array enables the adjustment of the power gain of the low noise amplifier. The capacitor array tunes the low noise amplifier so that the maximum power gain is at the desired operating frequency. The PMOS transconductance stage reduces the power consumption of the mixer. The inductor increases the impedance and the current source improves the common-mode rejection of the mixer.
    Type: Grant
    Filed: June 11, 2002
    Date of Patent: February 1, 2005
    Assignee: MuChip Co., Ltd
    Inventors: Zhao-Feng Zhang, David Jan-Chia Chen, Zhen-Chuan Liu, Meng-Hsiang Lai
  • Tunable low noise amplifier and current-reused mixer for a low power RF application
    Publication number: 20030228858
    Abstract: A radio frequency front-end receiver includes a single stage low noise amplifier connected with a resistor array and a capacitor array, and a Gilbert-type mixer connected with a PMOS transconductance stage, an inductor and a serially connected current source. The resistor array enables the adjustment of the power gain of the low noise amplifier. The capacitor array tunes the low noise amplifier so that the maximum power gain is at the desired operating frequency. The PMOS transconductance stage reduces the power consumption of the mixer. The inductor increases the impedance and the current source improves the common-mode rejection of the mixer.
    Type: Application
    Filed: June 11, 2002
    Publication date: December 11, 2003
    Inventors: Zhao-Feng Zhang, David Jan-Chia Chen, Zhen-Chuan Liu, Meng-Hsiang Lai