Figure 10From: Multistage Quadrature Sigma-Delta Modulators for Reconfigurable Multi-Band Analog-Digital Interface in Cognitive Radio DevicesAn example power spectral density of input signal used in the simulations. The desired information signals are located around center frequencies of 36.74 and -15.74 MHz with 16-QAM and QPSK waveforms, respectively. Two strongest signals are located on the mirror frequencies of the desired signals.Back to article page