公开(公告)号：US06002352A

公开(公告)日：1999-12-14

申请号：US881690

申请日：1997-06-24

Applicant: Hussein S. El-Ghoroury ,  Steven D. Hall ,  Matthew Millward

Inventor： Hussein S. El-Ghoroury ,  Steven D. Hall ,  Matthew Millward

IPC: H03M1/12 ,  H03D7/00 ,  H03M1/20 ,  H04B1/26 ,  H03M1/18

CPC classification number: H03M1/208

Abstract: A simple down converting A/D converter utilizing predictive coding principles. By placing the sampler inside the predictive loop, the predictive loop filter can be implemented using DSP techniques, thus eliminating the complexities introduced by use of discrete-time analog circuitry. Then, by re-mapping the output of the predictive loop filter into the analog domain using a D/A converter, the predictive filter output signal is subtracted from the input analog signal to generate the prediction error signal. Therefore, through directly sampling the prediction error signal and converting the output of the predictive loop filter into analog representation using a low-cost multiple bit D/A, the use of discrete-time analog circuitry is eliminated and the complexity of the converter design is greatly reduced. Various features of the invention are disclosed.

Abstract translation: 一种利用预测编码原理的简单的下变频A / D转换器。 通过将采样器放置在预测环路内，可以使用DSP技术实现预测环路滤波器，从而消除了使用离散时间模拟电路引入的复杂性。 然后，通过使用D / A转换器将预测环路滤波器的输出重新映射到模拟域，从输入的模拟信号中减去预测滤波器输出信号，以产生预测误差信号。 因此，通过直接采样预测误差信号并将预测环路滤波器的输出转换为模拟表示，使用低成本多位D / A，消除了离散时间模拟电路的使用，并且转换器设计的复杂性是 大大减少。 公开了本发明的各种特征。