Patent ID: 8693876

Claim:
A high-speed signal generator comprising: a digital signal processing (DSP) block for generating 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) for processing 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 for combining 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 digital signal processing (DSP) block comprises: an encoding block for processing an input digital signal to generate an encoded digital signal representative of the output analog signal; a Fast Fourier Transform (FFT) block for computing an array representative of a spectrum of the encoded digital signal; a Frequency Domain Processor (FDP) for processing 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; and a respective Inverse Fast Fourier Transform (IFFT) block for processing each sub-band array to generate a corresponding digital sub-band signal.