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A digital radio-over-fiber (DRoF) downlink system using envelope delta-sigma modulation (EDSM) for multimode/band applications is presented. Analyses and simulations reveal that the EDSM scheme increases tolerance to jitter introduced by optical components. This has been verified and demonstrated with a DRoF link using CMOS EDSM IC. As a result of the improvement, this system successfully meets major...
A reconfigurable digital transmitter for wireless sensors using phase-modulated-carrier-clocking multi-bit envelope ΔΣ modulation is presented. The prototype IC designed in 90 nm CMOS process covers UHF, 2.4GHz ISM and 3GPP frequency bands up to 3 GHz in conformity with IEEE 802.11g, W-CDMA and LTE in 5 MHz-mode. The IC dissipates 10 mW for 0.3 GHz and 8.0 mW for 1.95 GHz WCDMA signal, and occupies...
A 1-bit RF modulator using phase-modulated-carrier-clocking envelope ΔΣ modulation for a multi-mode/band transmitter is presented. The prototype IC designed in 90 nm CMOS process covers 2.4 GHz ISM and 3GPP frequency bands up to 3 GHz in conformity with IEEE 802.11g, W-CDMA and LTE in 5MHz-mode. The IC dissipates 8 mW for 1.95 GHz WCDMA and occupies 0.044 mm2.
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