Industry-university Cooperation Foundation Hanyang University

Samsung Electronics Co., Ltd.

Jeongjin Roh

Jong Pal Kim

Tak Hyung Lee

Jungsik Kim

Yeonggwang Bae

Danbi Choi

Tian Guo

Quanzhen Duan

Youngjae Jung

Woobin Kang

Disclosed herein is a voltage regulator having a capacitive feed-forward ripple cancellation circuit, which includes a pass unit configured to transfer, in response to a control signal, an input voltage provided from an input terminal to an output voltage of an output terminal, an error amplification unit configured to output a comparison signal on the basis of a magnitude comparison result between the output voltage and a reference voltage, and a capacitive feed-forward ripple cancellation unit configured to remove a ripple included in the input voltage using the reference voltage and the comparison signal in order to generate the control signal. In accordance with the present invention, a circuit capable of removing power supply noise while consuming a low quiescent current through a capacitive feed-forward ripple cancellation technique can be provided.

Voltage regulator having capacitive feed-forward ripple cancellation circuit

Disclosed herein is a low dropout (LDO) voltage regulator including an amplifier configured to receive a reference voltage through a negative input terminal, receive a feedback voltage through a positive input terminal, and amplify a difference between the feedback voltage and the reference voltage; a buffer which has an input connected to an output of the amplifier and an output and performs a buffering operation; a pass transistor configured to generate a driving current according to an output signal of the buffer; a voltage divider configured to form an output signal according to the driving current and generate a feedback voltage through a feedback resistor connected thereto; and a negative resistor circuit connected between the reference voltage and the feedback resistor and configured to generate a compensation current compensating for a loss current generated in the feedback resistor. In accordance with the present invention, the LDO voltage regulator, which greatly improves load regulation with a wide bandwidth by increasing a gain without increasing a size and current consumption of a transistor inside an amplifier, can be provided.

Low dropout voltage regulator

Provided is a delta-sigma modulator having a differential output, the modulator including a switched-capacitor integrator configured to generate a non-inverted integral signal and an inverted integral signal and also including a switched-capacitor circuit configured to sample an input signal based on a control signal and to integrate the feedback signal and the input signal based on the control signal and also a feedback circuit configured to generate the feedback signal.

Delta-sigma modulator having differential output

Growing community of inventors

Ansan-si, South Korea

Jeongjin Roh