Qingping Li

Title: Qingping Li: Innovator in Circuit Design

Introduction

Qingping Li is a notable inventor based in Hangzhou, China. He has made significant contributions to the field of circuit design, holding 2 patents that showcase his innovative approach to technology.

Latest Patents

One of his latest inventions is a multi-bit digitally controlled accurate current source circuit. This invention includes a reference current detection unit, a voltage buffer unit, a digital logic control unit, a switch array unit, and a current source array unit. The reference current detection unit generates a first bias voltage according to a reference current. The voltage buffer unit receives the first bias voltage and generates a buffer voltage accordingly. The digital logic control unit receives the buffer voltage and generates a digital control signal. The switch array unit receives the digital control signal and generates on-off signals accordingly. Finally, the current source array unit receives and responds to the on-off signals to control the turn-on and turn-off of the current sources. By adding only one voltage buffer, a cascode current source is formed, resulting in an area-saving accurate current source.

Another significant invention by Qingping Li is a relaxation oscillator. This invention includes a first comparator, a second comparator, an SR latch, and a capacitor control module. The input ends of the two comparators are coupled with the capacitor control module and an external reference threshold voltage. The two output ends are coupled with the input ends of the SR latch. The output ends of the SR latch are coupled with the input ends of the capacitor control module. According to the external reference threshold voltage, a first comparison signal generated by the first comparator and a second comparison signal generated by the second comparator are inputted into the SR latch to generate a control signal. This control signal, along with a bias current from the external bias current source, controls the periodic charging and discharging of capacitors to generate oscillating signals.

Career Highlights

Qingping Li is currently employed at Ampliphy Technologies Limited, where he continues to innovate and develop new technologies. His work has had a significant impact on the field of circuit design.

Collaborations

He collaborates with talented coworkers, including Yichao He and Tianlin Cao, who contribute to his projects and enhance the innovative environment at Ampliphy Technologies Limited.

Conclusion

Qingping Li is a distinguished inventor whose work