Patents by Inventor Kiat Seng Yeo

Kiat Seng Yeo 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).

  • Technique to generate negative conductance in CMOS tuned cascode RF amplifiers
    Patent number: 6292060
    Abstract: In this invention a single additional capacitor is added to a tuned cascode LNA which boosts the circuit Q and the gain of the amplifier. The added capacitor creates a negative real part of the impedance which when combined with the impedance of the LC tank circuit improves both the Q and the gain of the amplifier. The capacitor does not dissipate any power, and being a passive device the capacitor does not add additional noise to the circuit. With an improved gain there is a much improved signal to noise ratio. The higher Q allows the amplifier to provide some additional bandpass and reduce image reduction requirements in subsequent amplifier stages.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: September 18, 2001
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Kiat-Seng Yeo, Kok Lim Chan, Manh Anh Do, Jian Guo Ma, Johnny Kok Wai Chew