Hsueh-Chen Cheng

Title: Hsueh-Chen Cheng: Innovator in Voltage Regulation and Phase-Locked Loops

Introduction

Hsueh-Chen Cheng is a prominent inventor based in Hsinchu County, Taiwan. He has made significant contributions to the field of electrical engineering, particularly in voltage regulation and phase-locked loop technologies. With a total of six patents to his name, Cheng's work has had a notable impact on the industry.

Latest Patents

One of Cheng's latest patents is a voltage regulating circuit that provides a feedback voltage and an output voltage based on a power voltage. This circuit includes a reference voltage generator and a compensating circuit. The reference voltage generator receives the power voltage, produces the feedback voltage, and incorporates an impedance with first and second terminals. The second terminal is coupled to a ground voltage, and a first current flows through the impedance at the first terminal to produce the feedback voltage. The compensating circuit features a negative threshold voltage (NVT) transistor that adds a second current to the first current when activated under specific operational conditions.

Another significant patent is a phase-locked loop (PLL) and a method for controlling it. This PLL comprises a phase detector, a charge pump, a voltage-controlled oscillator (VCO), a feedback frequency divider, and a detector circuit. The phase detector generates a direction signal based on the comparison of phases between two clock signals. The charge pump converts this direction signal into a control voltage, which regulates the frequency of the third clock signal generated by the VCO. The feedback frequency divider then divides this frequency to produce the second clock signal.

Career Highlights

Hsueh-Chen Cheng is currently employed at United Microelectronics Corporation, where he continues to innovate and develop new technologies. His expertise in voltage regulation and PLLs has positioned him as a key player in the field.

Collaborations

Cheng has collaborated with notable colleagues, including Po-Hua Chen and Wen-Hong Hsu, who contribute to the innovative environment at United Microelectronics Corporation.

Conclusion

Hsueh-Chen Cheng's contributions to electrical engineering through his patents in voltage regulation and phase-locked loops highlight his role as a significant inventor in the industry. His work continues to influence advancements in technology and engineering practices.