Simulation methodology for Hybrid Filter Bank Analog to Digital Converters

The paper studies the problem of designing and simulating the high speed wide-band Analog-to-Digital Converters (ADC) working in bandpass scenario. Such ADCs play a crucial role in Software Defined Radio (SDR) technology or Cognitive Radio (CR). One approach to circumvent present-days limits of ADC technologies is to split the analog input signal into multiple components and then sample them with ADCs in parallel. In this paper the frequency splitting approach is implemented using Hybrid Filter Bank ADC (HFB ADC). The proper simulation methodology of the HFB ADC remains a challenge. Special care should be taken for utilizing real valued signal and filter coefficients at every step of calculation. When computation are done in the frequency domain, the nulls in the spectrum may give rise to singularities. A shifted Fourier Transform is proposed to get rid of this.