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QUAD SWITCHED MULTIBIT DIGITAL TO ANALOG CONVERTER AND CONTINUOUS TIME SIGMA-DELTA MODULATOR
QUAD SWITCHED MULTIBIT DIGITAL TO ANALOG CONVERTER AND CONTINUOUS TIME SIGMA-DELTA MODULATOR
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机译:Quad切换多Biribit Digital To Convent转换器和连续时间Sigma-Delta调制器
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摘要
A quad signal generator circuit generates four 2N−1 bit control signals in response to a sampling clock and a 2N−1 bit thermometer coded signal. A digital-to-analog converter (DAC) circuit has 2N−1 unit resistor elements, with each unit resistor element including four switching circuits controlled by corresponding bits of the four 2N−1 bit control signals. Outputs of the 2N−1 unit resistor elements are summed to generate an analog output signal. The quad signal generator circuit controls generation of the four 2N−1 bit control signals such that all logic states of bits of the four 2N−1 bit control signals remain constant for at least a duration of one cycle of the sampling clock. The analog output signal may be a feedback signal in a sigma-delta analog-to-digital converter (ADC) circuit that includes a multi-bit quantization circuit operating to quantize a filtered loop signal to generate the 2N−1 bit thermometer coded signal.
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机译:Quad信号发生器电路响应于采样时钟和2 N SUP> -1位温度计编码信号产生四个2 2 N SUP> -1位控制信号。数模转换器(DAC)电路具有2 N SUP> -1单元电阻元件,每个单元电阻元件包括由四个2 n s的相应位控制的四个开关电路。 sup> -1位控制信号。概括了2 n sup> -1单元电阻元件的输出以产生模拟输出信号。四边形信号发生器电路控制四个2 n sup> -1比特控制信号的生成,使得四个2 n sup> -1位控制信号的位的所有逻辑状态保持恒定对于采样时钟的一个循环的至少持续时间。模拟输出信号可以是Sigma-Delta模数转换器(ADC)电路中的反馈信号,其包括用于量化过滤的环路信号以产生2 N SUP的多比特量化电路。 > -1位温度计编码信号。
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