Abstract:
The present invention relates to a pipeline analog to digital converter (ADC) comprising: an ADC module including N (N is natural number) sub modules discriminating analog input signals according to signal size intervals and performing digital conversion, and making some of the sub modules amplify a residual voltage to a range larger than an amplitude range of the analog input signals and transfer the amplified voltage to the next sub module; a clock signal generator for providing clock signals for the digital conversion to the N ADC modules; and a digital correction circuit for receiving the digital signal from the N ADC modules, correcting the received digital signal, and outputting the digital signal with M (M is natural number) bits.
Abstract:
PURPOSE: A digital analog converter which applies an electric charge subtraction method is provided to minimize errors of capacitors and relatively reduce a size of a decoder. CONSTITUTION: A control signal generating device(340) generates a switch control signal in response to digital data of N bits. A resistance string(310) comprises a first resistor array, a second resistor array, and a third resistor array which respectively divide multiple resistances which are connected between a reference voltage and a grounding voltage in series. A switch block(320) outputs a selection voltage by switching a part of voltage which is applied to any node of multiple serial resistances respectively included in the first resistor array, the second resistor array, and the third resistor array in response to the switch control signal. A conversion voltage generating block(330) generates a conversion voltage in response to a negative phase clock signal which is opposite to a positive phase clock signal.
Abstract:
PURPOSE: A double slope integrating ADC(Analog To Digital Converter) is provided to minimize a chip area by forming a switch control logic circuit part with a MCU(Micro Control Unit) and a single chip by using a standard CMOS(Complementary Metal Oxide Semiconductor) process. CONSTITUTION: An LOTA(Linear Operational Transconductance Amplifier) outputs a current by being applied with an analog input voltage and a reference voltage. First resistance applies the analog input voltage to an (+) input terminal in the LOTA. A first switch applies the analog input voltage to the first resistance according to a control signal. Second resistance applies the reference voltage to a (-) input terminal in the LOTA. The second switch applies the reference voltage to the second resistance according to the control signal. A capacitor outputs a voltage by charging an output current in the LOTA. A third switch initializes the output current in the LOTA and the voltage charged in the capacitor. A comparator outputs two constant voltages. A switch control logic circuit outputs the control signal controlling the operation of first, second, and third switches.
Abstract:
PURPOSE: A digital to analog converter for revising mismatch between capacitors is provided to reduce error possibility in a display output by revising errors due to mismatch between capacitors. CONSTITUTION: A DAC(Digital To Analog Converter) is composed of three capacitors(C1,C2,C3) with the same capacity as one operational amplifier(10) and switches(S1-S9). The operational amplifier includes a first input terminal, a second input terminal, and an output terminal. The second input terminal is connected to a ground terminal. A second capacitor and a third capacitor are used to revise mismatch between capacitors. The first capacitor, the second capacitor, the third capacitor, and the operational amplifier are differently connected for sampling and mismatch correction according to a turn on and off operation of the switch.
Abstract:
본 발명은 전류구동방식의 DAC에 관한 것으로서, MSB에 대응하는 제 1 CCA, ISB에 대응하는 제 2 CCA, LSB에 대응하는 제 3 CCA, 및 제 1 CCA, 제 2 CCA, 그리고 제 3 CCA 각각에 상호 독립적인 기준 전류를 공급하는 CSA를 포함하고, MSB와 ISB는 온도계 코드, LSB는 이진 가중치 코드로 구성하는 것을 특징으로 하며, 전류 셀의 크기를 줄임으로써, 전체 칩 면적을 줄일 수 있으며, 기생 커패시터 성분에 의한 고속 동작에서의 성능저하를 막을 수 있다.
Abstract:
PURPOSE: A digital to analog converter is provided to reduce a circuit space and improve an operation speed by reducing the number of resistance, switches, and decoders. CONSTITUTION: A first resistance string(222) generates an analog signal corresponding to the input of a MSB(Most Significant Bit). A second resistance string(232) generates an analog signal corresponding to the input of a LSB(Least Significant Bit). A reference current generating unit applies a bias current to the first and the second resistance string. An output buffer(240) outputs an analog signal corresponding to the voltage generated in the first and the second resistance string.