Qualitas Semiconductor Co., Ltd.

Seoul National University

Duho Kim

Jae Young Kim

Maenghyo Cho

Tae Hwan Jin

Jin-Myoung Lim

Kyeong-jae Cho

A circuit for processing an N-level pulse amplitude modulation (PAM-N) signal according to an embodiment of the present invention comprises: an input unit receiving an input signal; a main amplifier connected to the input unit to amplify the input signal with a first gain; and an output unit outputting an output signal of the main amplifier, and the circuit further comprises an auxiliary amplifier connected in parallel with the main amplifier between the input unit and the output unit to variably amplify at least a portion of the input signal and apply the signal to the output unit according to a linearity improvement control signal corresponding to the output signal.

Signal processing circuit improving linearity of pulse amplitude modulated signal and communication device including the circuit

Provided are an adaptive equalization apparatus and a method using the same of, for optimizing digital algorithm, responding proactively in dynamic environmental change, and adjusting the monitoring range according to the signal size. The adaptive equalization apparatus includes a first equalizer filter for compensating and outputting for components of a high frequency band of an input signal; a second equalizer filter for, installed in parallel with the first equalizer filter, monitoring the input signal; a size comparison unit for sampling the size of a monitoring signal from the second equalizer filter at each period of an asynchronous clock signal; and a digital control unit for collecting the comparison data in the size comparison unit as changing an equalizer monitoring code to be provided to the second equalizer filter and a reference signal of the size comparison unit, and finding and providing an optimal equalizer control code to the first equalizer filter based on the collected comparison data; wherein the second equalizer filter compensates and outputs the input signal according to an equalizer monitoring code of the digital control unit to find an optimal equalizer control code in the digital control unit.

Adaptive equalization apparatus and method of using the same

Provided is an Active Optical Cable (AOC) device for short-range optical communication. The AOC device includes an electrical wire between a transmitter and a receiver for the feedback of a monitoring signal from the receiver. The receiver further includes a monitoring circuit to control the compensation of a high frequency component of an equalizing filter, acquire the result of receiving signal size determination and a high frequency component compensation from the equalizing filter, and perform the feedback of the acquired monitoring signal to the transmitter through the electrical wire. The transmitter further includes a transmitter control circuit to receive the feedback monitoring signal from the receiver through the electrical wire and control a high frequency component control code of the high frequency component control circuit and an optical signal output size control code of the optical device driving circuit based on the received monitoring signal.

Active optical cable (AOC) device and operation control method thereof

Disclosed are a positive active material for a rechargeable lithium battery, a method of manufacturing the same, and a rechargeable lithium battery including the same. More specifically, the positive active material for a rechargeable lithium battery is a compound having an orthorhombic layered structure represented by the following Chemical Formula 1 or a compound represented by the following Chemical Formula 2, a method for producing the same, and a rechargeable lithium battery including the same.LiMO&#x2003;&#x2003;[Chemical Formula 1]{(LiMO)}.{(LiMO)}&#x2003;&#x2003;[Chemical Formula 2]

Growing community of inventors

Seoul, South Korea

Duho Kim