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EURASIP Journal on Wireless Communications and Networking
Figure 9 | EURASIP Journal on Wireless Communications and Networking

Figure 9

From: Multistage Quadrature Sigma-Delta Modulators for Reconfigurable Multi-Band Analog-Digital Interface in Cognitive Radio Devices

Figure 9

Three-stage QΣΔM STF and ISTF ( top ) together with NTF and INTF for first-, second-, and third-stage quantization noises. Five independent random realizations in real gain values of feedback branches of both stages and mirror-frequency-rejecting STF design in first stage. Multi-band reception of two information signals with center frequencies of 36.74 and -15.74 MHz is assumed. These bands are marked with gray solid lines in the plots.

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