Abstract: An object recognition system using an ultrasonic sensor is proposed, the system including an amplifier amplifying an output of the ultrasonic sensor; an analog-to-digital converter converting an output of the amplifier into a digital signal; and a feature point extractor extracting feature points using an output of the analog-to-digital converter; and an object recognizer recognizing the object by using the feature points extracted from the feature point extractor.

Abstract: An object recognition system using an ultrasonic sensor is proposed, the system including an amplifier amplifying an output of the ultrasonic sensor; an analog-to-digital converter converting an output of the amplifier into a digital signal; and a feature point extractor extracting feature points using an output of the analog-to-digital converter; and an object recognizer recognizing the object by using the feature points extracted from the feature point extractor.

Abstract: Provided is a method of correcting temperature characteristics of an audio device that includes a first microphone and a second microphone, including: measuring a temperature of the first microphone at a step (a-1); correcting an output signal of the first microphone at a step (b-1) using the measured temperature at the step (a-1); and calculating an output signal of the audio device at a step (c) using the corrected output signal of the first microphone at the step (b-1).

Abstract: A system for detecting and controlling an abnormal state of an electrical signal, includes: an abnormality decision part determining whether or not an electrical signal detected from a power line is abnormal by using the electrical signal and generating a control signal for controlling ON/OFF of N switches included in a leakage breaker. The system for detecting and controlling the abnormal state of the electrical signal is capable of controlling an operation of the leakage breaker by using voltage and current signals detected from the power line through which commercial power is supplied and functioning as a black box when an accident occurs such as a fire, etc.

Abstract: A semiconductor circuit having a test function includes: a first circuit block including a circuit for performing a main function of the semiconductor circuit; a first power control block for controlling supply of power to the first circuit block; a second circuit block including a circuit for performing a function of testing the semiconductor circuit; and a second power control block for controlling supply of power to the second circuit block. The semiconductor circuit is operable in a first power mode in which a first pad is supplied with a supply voltage and a second pad is grounded, or in a second power mode in which the second pad is supplied with the supply voltage and the first pad is grounded. The second power control block is implemented as a diode.

Abstract: An analog-to-digital conversion device for multiple input signals includes a sample-and-hold amplifier and an analog-to-digital converter for converting an analog signal output from the sample-and-hold amplifier into a digital signal. According to the analog-to-digital conversion device for multiple input signals and a conversion method therefor, even if an input buffer is not provided, the dynamic range of the analog-to-digital converter may be optimally set depending on the input signals, and current consumption may be reduced.

Abstract: An analog-to-digital conversion device for multiple input signals includes a sample-and-hold amplifier and an analog-to-digital converter for converting an analog signal output from the sample-and-hold amplifier into a digital signal. According to the analog-to-digital conversion device for multiple input signals and a conversion method therefor, even if an input buffer is not provided, the dynamic range of the analog-to-digital converter may be optimally set depending on the input signals, and current consumption may be reduced.

Abstract: A semiconductor circuit having a test function is operated by applying power between a first pad and a second pad, and includes a first circuit block including a circuit for performing a main function of the semiconductor circuit; a second circuit block including a circuit for performing a function of testing the semiconductor circuit; and a diode connected in series with the second circuit block. In accordance with the semiconductor circuit having a test function, additional control pads and control signals are not required, thus suppressing an increase in the area of a semiconductor chip due to pads by reducing the number of pads.

Abstract: In accordance with a startup circuit, a capacitive sensor amplification device having the startup circuit, and a startup method for the amplification device, a startup time can be shortened by connecting the high impedance resistor of an amplifier to a predetermined voltage source during startup. The capacitive sensor amplification device includes an amplification unit for amplifying a signal input to the amplification device; and a startup circuit for improving a startup time of the amplification unit, wherein the startup circuit includes a comparator for receiving an output of the amplification unit as a first comparison signal, receiving a preset reference voltage as a second comparison signal, comparing the comparison signals with each other, and outputting a comparison result; and a switch for selecting and outputting one of a first voltage and a second voltage depending on the output of the comparator.

Abstract: In accordance with a startup circuit, a capacitive sensor amplification device having the startup circuit, and a startup method for the amplification device, a startup time can be shortened by connecting the high impedance resistor of an amplifier to a predetermined voltage source during startup. The capacitive sensor amplification device includes an amplification unit for amplifying a signal input to the amplification device; and a startup circuit for improving a startup time of the amplification unit, wherein the startup circuit includes a comparator for receiving an output of the amplification unit as a first comparison signal, receiving a preset reference voltage as a second comparison signal, comparing the comparison signals with each other, and outputting a comparison result; and a switch for selecting and outputting one of a first voltage and a second voltage depending on the output of the comparator.

Abstract: Provided are a digital condenser microphone having a preamplifier with variable input impedance and a method of controlling the variable input impedance of the preamplifier. The preamplifier includes a bias terminal for applying a bias voltage to an input signal when the input signal is output from a microphone condenser. An impedance unit includes at least one variable input impedance element which is connected to the bias terminal and to which the bias voltage is applied via the bias terminal. An operational amplifier receives the input signal, converts the input signal into an output signal, and outputs the output signal. A control block determines whether a DC voltage level of the output signal output from the operational amplifier has reached a reference value, and controls a total impedance of the impedance unit based on a result of the determination.

Abstract: A modulation apparatus for a class D switching amplifier is capable of reducing power consumption of an Electro-Migration Interface (EMI) of an output end and a gate driver end in a zero input signal. The modulation apparatus for a class D switching amplifier includes a control unit for detecting and outputting a control signal which is a common signal component of a first modulation signal modulated by using a first input signal and a second modulation signal modulated by using a second input signal; and is characterized by feedback of a first output signal, a second output signal and a common output signal outputted by using the first modulation signal, the second modulation signal and the control signal through an input of the modulation apparatus.

Abstract: A modulation apparatus for a class D switching amplifier is capable of reducing power consumption of an Electro-Migration Interface (EMI) of an output and a gate driver in a zero input signal. The modulation apparatus for a class D switching amplifier includes a control unit for detecting and outputting a control signal which is a common signal component of a first modulation signal modulated by using a first input signal and a second modulation signal modulated by using a second input signal; and is characterized by feedback of a first output signal, a second output signal and a common output signal outputted by using the first modulation signal, the second modulation signal and the control signal through an input of the modulation apparatus.

Abstract: The present invention provides a digital condenser microphone having a preamplifier with variable input impedance and a method of controlling the variable input impedance of the preamplifier. The preamplifier includes a bias terminal (Bias) for applying a bias voltage to an input signal when the input signal is output from a microphone condenser. An impedance unit (Z) includes at least one variable input impedance element which is connected to the bias terminal and to which the bias voltage is applied via the bias terminal. An operational amplifier receives the input signal, converts the input signal into an output signal, and outputs the output signal. A control block (40) determines whether a DC voltage level of the output signal output from the operational amplifier has reached a reference value, and controls a total impedance of the impedance unit based on a result of the determination.

Abstract: A circuit of reducing a pop-up noise in a digital amplifier includes a switch unit and a switch signal generator. The switch unit is coupled in parallel to an output load between an output node of the digital amplifier and a reference node. The switch unit controls a current flowing through the output load by forming a conduction path between the output node and the reference node in response to a switch signal. The switch signal generator generates the switch signal in response to a switch control signal indicating a power-on or a power-off. The pop-up noise is reduced by the conduction path that is formed when the digital amplifier is powered on or off.

Abstract: The invention relates to a pulse width modulator, more particularly to a cross-coupled pulse width modulator. A crossing input signal modulator according to the present invention comprises: a positive path block which includes a first integrator for performing the first-order integration of feedback signals in first input and output signals and then transmitting the first-order integrated signals to a second integrator, and a second integrator for performing the second-order integration of a signal from the first integrator and a second input signal and then transmitting the second-order integrated signals; and a negative path block which includes a third integrator for performing the first-order integration of feedback signals in the second input and output signals and integration of a signal from the third integrator and the first input signal and then transmitting the second-order integrated signals.

Abstract: The invention relates to a pulse width modulator, more particularly to a cross-coupled pulse width modulator. A crossing input signal modulator according to the present invention comprises: a positive path block which includes a first integrator for performing the first-order integration of feedback signals in first input and output signals and then transmitting the first—order integrated signals to a second integrator, and a second integrator for performing the second-order integration of a signal from the first integrator and a second input signal and then transmitting the second-order integrated signals; and a negative path block which includes a third integrator for performing the first-order integration of feedback signals in the second input and output signals and integration of a signal from the third integrator and the first input signal and then transmitting the second-order integrated signals.

Abstract: A spirofluorene-based polymer which contains a spirofluorene structure as a basic unit and which is end-capped with functional moieties substituted by fluorine, and an organic electroluminescent device using an organic layer using the spirofluorene-based polymer. The organic electroluminescent device has improved efficiency, reduced driving voltage, and excellent thermal, optical and electrical stability.

Abstract: Hematin, a hydroxyferriprotoporphyrin, is derivatized with one or more non-proteinaceous amphipathic groups. The derivatized hematin can serve as a mimic of horseradish peroxidase in polymerizing aromatic monomers, such as aromatic compounds. These derivatized hematins can also be used as catalysts in polymerizing aromatic monomers, and can exhibit significantly greater catalytic activity than underivatized hematin in acidic solutions. In one embodiment, polymerization is in the presence of a template, along which aromatic monomers align. An assembled hematin includes alternating layers of hematin and a polyelectrolyte, which are deposited on an electrically charged substrate. Assembled hematin can also be used to polymerize aromatic monomers.

Abstract: A circuit of reducing a pop-up noise in a digital amplifier includes a switch unit and a switch signal generator. The switch unit is coupled in parallel to an output load between an output node of the digital amplifier and a reference node. The switch unit controls a current flowing through the output load by forming a conduction path between the output node and the reference node in response to a switch signal. The switch signal generator generates the switch signal in response to a switch control signal indicating a power-on or a power-off. The pop-up noise is reduced by the conduction path that is formed when the digital amplifier is powered on or off.