Wei-Kang Cheng

Title: Innovations of Wei-Kang Cheng

Introduction

Wei-Kang Cheng is a notable inventor based in Milpitas, CA (US). He has made significant contributions to the field of electronics, particularly in the development of phase-locked loop circuits. With a total of 4 patents to his name, Cheng's work has advanced the technology used in frequency synthesis.

Latest Patents

Cheng's latest patents include a PLL frequency synthesizer with a multi-curve VCO implementing closed loop curve searching. This invention features a phase-locked loop circuit that utilizes a multi-curve voltage-controlled oscillator (VCO). Each operating curve corresponds to a different frequency range over a control voltage range. The digital control circuit generates a curve select signal through a closed loop curve search operation, allowing the selection of one of the operating curves in the multi-curve VCO. This selected operating curve is then used to generate an output signal with a frequency that is equal to or close to the target frequency of the phase-locked loop.

Another significant patent by Cheng is the PLL frequency synthesizer with multi-curve VCO implementing closed loop curve searching using charge pump current modulation. This invention also employs a multi-curve VCO and includes a phase and frequency detector that drives a charge pump. The digital control circuit performs a closed loop curve search operation to select one of the operating curves and conducts a curve tracking operation using the selected curve. During the closed loop curve search operation, the digital control circuit increases the charge pump current above a nominal value, ensuring optimal performance.

Career Highlights

Wei-Kang Cheng is currently employed at Micrel, Incorporated, where he continues to innovate in the field of electronics. His work has been instrumental in enhancing the efficiency and accuracy of frequency synthesizers.

Collaborations

Cheng collaborates with fellow inventor Juinn-Yan Chen, contributing to advancements in their shared field of expertise.

Conclusion

Wei-Kang Cheng's contributions to the field of electronics, particularly in phase-locked loop circuits, demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to advancing technology and improving electronic systems.