Jialin Zhao

Title: Jialin Zhao: Innovator in Digital to Analog Conversion Technology

Introduction

Jialin Zhao is a prominent inventor based in Beijing, China, known for his significant contributions to the field of digital to analog conversion technology. With a total of 15 patents to his name, Zhao has made remarkable advancements that address critical challenges in the industry.

Latest Patents

One of Zhao's latest patents is focused on DAC duty cycle error correction. This innovation allows digital to analog converters (DACs) to generate an analog output that accurately corresponds to a digital input by controlling DAC cells with bits of the digital input. The DAC cells contribute individually to the analog output, but variations in process, voltage, and temperature can lead to duty cycle errors. Zhao's method compensates for these errors by injecting a small amount of charge into a low-impedance node of a DAC cell when the data signal transitions. This charge, generated using a capacitive T-network, is opposite to the error charge caused by the duty cycle error, effectively reducing the error present at the output.

Another notable patent by Zhao addresses background duty cycle error measurement for RF DACs. This invention also generates an analog output corresponding to a digital input by controlling unit elements or cells. Due to variations, these elements may experience mismatches or errors that degrade output quality. Zhao's approach utilizes a transparent dither to extract these mismatches and errors by observing the analog output and performing a cross-correlation with a switching bit stream of the dither. This allows for adjustments to be made to the unit elements or cells, thereby improving the overall performance.

Career Highlights

Throughout his career, Jialin Zhao has worked with esteemed companies such as Analog Devices International Unlimited Company and Analog Devices Global. His experience in these organizations has allowed him to refine his expertise and contribute to groundbreaking innovations in the field.

Collaborations

Zhao has collaborated with notable colleagues, including Yunzhi Dong and Hajime Shibata, who have played significant roles in his research and development efforts.

Conclusion

Jialin Zhao's innovative work in digital to analog conversion technology has led to significant advancements in the field. His patents not only address critical issues such as duty cycle errors but also enhance the overall quality of analog outputs. Zhao's contributions continue to influence the industry and pave the way for future innovations.