Abstract:
A phase change memory device and a method of manufacturing the same are provided, which can prevent misalignment problem of the bottom electrode and diffusion stopper. The phase change memory device comprises the storage node and the switching element connected to the storage node. The storage node comprises electrode and phase-change layer(30). The diffusion stopper(20) includes the silicide compound between the electrode and phase-change layer. The silicide compound includes at least one among silicide, silicide oxide, and silicide nitride. The electrode is the bottom electrode(10).
Abstract:
An operation method of the phase change memory device is provided, which recovers the phase-change layer to the steady-state by authorizing the treatment voltage greater than the reset voltage to the phase-change layer. An operation method of the phase change memory device authorizes the treatment voltage which is greater than the reset voltage to the phase-change layer. The authentication hour of the treatment voltage is longer than the authentication hour of the reset voltage. The intensity of the treatment voltage is 1.1 times or greater of the reset voltage. The authentication hour of the treatment voltage is one micro-second or greater. The treatment voltage is one pulse voltage. The treatment voltage comprises two or more pulse voltages which are consecutively applied.
Abstract:
PURPOSE: An operational amplifier circuit, an image sensor including the same, and a method for compensating a frequency response of an operational amplifier are provided to output a high frequency signal by widening a bandwidth and implementing stability by adjusting capacitance according to a feedback gain. CONSTITUTION: An operational amplifier circuit includes a first operational amplifier(10), a second operational amplifier(20), a feedback block(30) and a variable compensation capacitor(Cc). The first operational amplifier differentially amplifies an input signal. A load capacitor and the variable compensation capacitor are connected to an output port of the first operational amplifier. The feedback block adds a feedback gain to the output of the first operational amplifier and then feeds back the result to the input of the first operational amplifier. The capacitance of the variable compensation capacitor varies on the basis of the feedback gain.