High speed signal generator

摘要

A high-speed signal generator. A digital signal processing (DSP) block generates a set of N (where N is an integer and N≧2) parallel digital sub-band signals, each digital sub-band signal having frequency components within a spectral range between 0 Hz and ±Fs/2, where Fs is a sample rate of the digital sub-band signals. A respective Digital-to-Analog Converter (DAC) processes each digital sub-band signal to generate a corresponding analog sub-band signal, each DAC having a sample rate of Fs/2. A combiner combines the analog sub-band signals to generate an output analog signal having frequency components within a spectral range between 0 Hz and ±NFs/2.

主权项

1. A high-speed signal generator comprising:
a digital signal processing (DSP) block configured to generate a set of N (where N is an integer and N≧2) parallel digital sub-band signals, each digital sub-band signal having frequency components within a spectral range between 0 Hz and ±Fs/2, where Fs is a sample rate of the digital sub-band signals; a respective Digital-to-Analog Converter (DAC) configured to process each digital sub-band signal to generate a corresponding analog sub-band signal, each DAC having a sample rate of Fs/2; and a combiner configured to combine the analog sub-band signals to generate an output analog signal having frequency components within a spectral range between 0 Hz and ±N·Fs/2, wherein the combiner is configured to combine the analog sub-band signals in the optical domain; wherein the digital signal processing (DSP) block comprises:
an encoding block configured to process an input digital signal to generate an encoded digital signal representative of the output analog signal;a Fast Fourier Transform (FFT) block configured to compute an array representative of a spectrum of the encoded digital signal;a Frequency Domain Processor (FDP) configured to process the array to generate a set of N sub-band arrays, each sub-band array including spectral components for a respective one of the parallel digital sub-band signals; anda respective Inverse Fast Fourier Transform (IFFT) block configured to process each sub-band array to generate a corresponding digital sub-band signal.