Figure 12From: Multistage Quadrature Sigma-Delta Modulators for Reconfigurable Multi-Band Analog-Digital Interface in Cognitive Radio DevicesExample power spectral densities of output signals used in simulations with frequency-flat and mirror-frequency-rejecting STF designs with 16-QAM information signal around center frequency of 36.74 MHz disabled to highlight image rejection properties. 3-bit quantizers are used in all the three stages.Back to article page