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EURASIP Journal on Wireless Communications and Networking
Figure 11 | EURASIP Journal on Wireless Communications and Networking

Figure 11

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

Figure 11

Example power spectral densities of output signals used in simulations: a) with frequency-flat STF design, b) with mirror-frequency-rejecting STF design. The desired information signals are located around center frequencies of 36.74 and -15.74 MHz with 16-QAM and QPSK waveforms, respectively. 3-bit quantizers are used in all the three stages.

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