SIGNAL PREDICATION FOLDING AND INTERPOLATING ADC METHOD BASED ON POWER SPECTRUM ESTIMATION

摘要

A signal predication folding and interpolating ADC method based on power spectrum estimation comprises a N F =N coarse +N fine bit pipelined folding and interpolating ADC, a signal predication unit based on power spectrum estimation, a digital to analog converter, and a subtraction unit. The pipelined folding and interpolating ADC comprises a front-end single sample-and-hold circuit, a distributed sample-and-hold circuit, an analog folding pre-processing circuit, a fine quantization ADC, and a coarse quantization ADC. An input signal x(t) of an ADC of an analog front end of an SDR receiving system is formed by modulation signals from different standards, wavebands, and modes and processed by an analog front end of the ADC, and the x(t) covers different frequency spectrums and has different signal power. The solution solves the precision and speed boundary problem of the ADC, increases the input dynamic range of the ADC, and meets the requirement of the SDR receiver for a high-performance ADC.