Samsung Electronics Co., Ltd.

Sungkyunkwan University

Sunwoo Kwon

Myung-Jin Lee

Bai-Sun Kong

Hyungdong Roh

Mooyeol Choi

A delta-sigma modulator includes a loop filter, a quantizer configured to change an analog output signal into a digital signal, and a digital-to-analog converter configured to receive the digital signal and including a first capacitor and a second capacitor. In a first sampling period, the first capacitor is discharged, and at the same time, the second capacitor is charged with a reference voltage. In a second sampling period, the digital signal includes noise caused by a clock jitter, the first capacitor is charged with a reference voltage, and the second capacitor is discharged and generates a charge corresponding to the noise. In a next first sampling period, the first capacitor is discharged, and at the same time, the second capacitor generates a noise current corresponding to the noise using the charge and is charged with a reference voltage.

Delta sigma modulator for shaping noise and audio codec having the same

A reference voltage generator including an electrostatic discharge (ESD) resistor, a first branch coupled to the ESD resistor and including a first capacitor, a second branch coupled to the ESD resistor and including a second capacitor, wherein the first and second capacitors are coupled in parallel, a first switch configured to control a first charge transfer path leading to the first branch, and a second switch configured to control a second charge transfer path leading to the second branch.

Growing community of inventors

Seongnam-si, South Korea

Sunwoo Kwon