Abstract:
디지털-아날로그 변환기가 개시된다. 상기 디지털-아날로그 변환기는 제1커패시터, 제2커패시터, 연산 증폭기, 및 각각이 복수의 스위칭 신호들 중에서 대응되는 스위칭 신호에 응답하여 스위칭되는 복수의 스위치들을 포함하는 스위칭 회로를 포함한다. 상기 스위칭 회로의 동작에 의하여 상기 제1커패시터가 프리-차지 커패시터로서 사용되는 경우에는 상기 제2커패시터는 샘플-홀드 커패시터로서 사용되고, 상기 제2커패시터가 프리-차지 커패시터로서 사용되는 경우에는 상기 제1커패시터는 샘플-홀드 커패시터로서 사용된다. DAC, RC-DAC, OP AMP
Abstract:
A digital analog converter, a converting method of the digital analog converter, and a display panel driver including the digital analog converter are provided to remove the offset of chopping amplifier by driving alternately the chopping amplifier in non-inverting or inverting modes. A digital analog converter includes a chopping amplifying unit(560), which receives higher and lower bit voltages corresponding to higher x bits and lower y bits of n bit data, and outputs analog data voltages. The chopping amplifying unit includes a sample hold capacitor(S_SH) and a chopping amplifier(AMP_chop). The sample hold capacitor is charged by the higher bit voltage in a non-inverting mode. The chopping amplifier supplies the higher bit voltage to the sample hold capacitor in the non-inverting mode and outputs voltage, which the higher bit voltage is added with the lower bit voltage, as the analog data voltage in an inverting mode.
Abstract:
A CMOS image sensor and a method for manufacturing the same are provided to enhance the quality of the product by increasing the transmission efficiency of charges. A CMOS(Complementary Metal Oxide Semiconductor) image sensor includes an active region, a photo diode and a floating diffusion region(FD), a gate(35) of a transfer transistor(30), and at least one dopant doping region(7). The active region is defined by an element isolation region(20). The photo diode and floating diffusion region are disposed in parallel with the active region. The gate of the transfer transistor is formed to cross over the active region between the photo diode and floating diffusion region. The density of dopant doping regions formed in the active region is varied based on distance with the floating diffusion area.
Abstract:
A CMOS image sensor and its driving method are provided to stably drive unit cells while decreasing the number of devices required for the unit cells. A CMOS image sensor includes plural unit cells(100) having a 3-transistor structure. Each unit cell has a photodiode(PD) converting light energy into an electric signal, a transmission transistor(T11) transmitting photo charge stored in the photodiode to a floating diffusion region(FD), a driver transistor(T13) connected to the floating diffusion region at a gate electrode, and a capacitive device(110) connected between a control voltage source(200) and the floating region. The device changes a voltage of the floating diffusion region according to level fluctuation of the control voltage source.
Abstract:
온도센서는밴드갭 레퍼런스회로, 온도전압생성부및 디지털 CDS 회로를포함한다. 밴드갭 레퍼런스회로는온도에비례하는기준전압을생성한다. 온도전압생성부는기준전압에기초하여온도에비례하는제1 온도전압및 제2 온도전압을출력한다. 디지털 CDS 회로는제1 온도전압및 제2 온도전압에대해상관이중샘플링을수행하여온도를나타내는디지털신호를출력한다. 온도센서는주위의온도를정확하게측정할수 있다.