Abstract: A wafer manufacturing method, an epitaxial wafer manufacturing method, and a wafer and epitaxial wafer manufactured thereby, are provided. The wafer manufacturing method enables the manufacture of a wafer with a low density of micropipe defects and minimum numbers of particles and scratches. The epitaxial wafer manufacturing method enables the manufacture of an epitaxial wafer that has low densities of defects such as downfall, triangular, and carrot defects, exhibits excellent device characteristics, and improves the yield of devices.

Abstract: A wafer manufacturing method, an epitaxial wafer manufacturing method, and a wafer and epitaxial wafer manufactured thereby, are provided. The wafer manufacturing method enables the manufacture of a wafer with a low density of micropipe defects and minimum numbers of particles and scratches. The epitaxial wafer manufacturing method enables the manufacture of an epitaxial wafer that has low densities of defects such as downfall, triangular, and carrot defects, exhibits excellent device characteristics, and improves the yield of devices.

Abstract: A probe device is disclosed. The probe device comprises: a matrix array analog front end (AFE) comprising a plurality of cells and outputting an electrical signal corresponding to each of the plurality of cells; a transducer unit for transducing, into an ultrasound signal, the electrical signal outputted from each of the plurality of cells; and a processor for grouping the plurality of cells into at least one group corresponding to at least one diagnosis mode, and performing control such that cells corresponding to each group outputs, through the transducer unit, an ultrasound signal having a characteristic differing according to a corresponding diagnosis mode. Therefore, various functions can be supported while using one probe device.

Abstract: An ultrasonic image apparatus is provided. The ultrasonic image apparatus includes a plurality of transducers configured to output an ultrasonic signal and receive a feedback signal, a driver comprising a plurality of driving circuits respectively connected to the plurality of transducers, each driving circuit configured to output the ultrasonic signal and receive the feedback signal, a detection circuit respectively corresponding to the plurality of driving circuits, the detection circuit configured to detect whether any of the plurality of transducers is defective, and at least one processor configured to control the driving circuit to stop operations corresponding to at least one defective transducer among the plurality of transducers based on a defect detection result from the detection circuit with regard to the plurality of transducers.

Abstract: An apparatus of a Harmonic Rejection Mixer (HRM) for removing a harmonic component and an operating method thereof are provided. The HRM includes a Local Oscillator (LO), at least one frequency converter, at least two mixers, at least one phase converter, and a combiner. The LO generates an LO signal. The at least one frequency converter multiplies the LO signal using different variables to provide the same to at least two mixers. The at least two mixers convert a frequency band of an input signal using the LO signal provided from the LO and the at least one frequency converter. The at least one phase converter controls a phase of an output signal of at least one other mixer excluding one of the at least two mixers. The combiner combines an output signal of the one mixer with an output signal of the at least one phase converter.

Abstract: An apparatus of a Harmonic Rejection Mixer (HRM) for removing a harmonic component and an operating method thereof are provided. The HRM includes a Local Oscillator (LO), at least one frequency converter, at least two mixers, at least one phase converter, and a combiner. The LO generates an LO signal. The at least one frequency converter multiplies the LO signal using different variables to provide the same to at least two mixers. The at least two mixers convert a frequency band of an input signal using the LO signal provided from the LO and the at least one frequency converter. The at least one phase converter controls a phase of an output signal of at least one other mixer excluding one of the at least two mixers. The combiner combines an output signal of the one mixer with an output signal of the at least one phase converter.

Abstract: A mixer used in a Radio Frequency (RF) receiver is provided. The mixer includes a first harmonic rejecter for rejecting a harmonic signal component from a first input signal; and a second harmonic rejecter for rejecting a harmonic signal component from a second input signal. The first harmonic rejecter and the second harmonic rejecter are connected in parallel to reject an image signal component from the first input signal and the second input signal. Thus, the RF receiver can reject the harmonic signal and the image signal without using an external element.