An All-Digital RF Signal Generator Using High-Speed $\Delta\Sigma$ Modulators
Autor: | A. Flament, Andreas Kaiser, Andrea Cathelin, B. Stefanelli, A. Frappe |
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Rok vydání: | 2009 |
Předmět: |
Engineering
Signal generator business.industry 020208 electrical & electronic engineering Clock rate Electrical engineering 020206 networking & telecommunications 02 engineering and technology Delta-sigma modulation CMOS Modulation 0202 electrical engineering electronic engineering information engineering Electronic engineering Radio frequency Electrical and Electronic Engineering Center frequency business Frequency modulation |
Zdroj: | IEEE Journal of Solid-State Circuits. 44:2722-2732 |
ISSN: | 1558-173X 0018-9200 |
DOI: | 10.1109/jssc.2009.2028406 |
Popis: | An all-digital RF signal generator using DeltaSigma modulation and targeted at transmitters for mobile communication terminals has been implemented in 90 nm CMOS. Techniques such as redundant logic and non-exact quantization allow operation at up to 4 GHz sample rate, providing a 50 MHz bandwidth at a 1 GHz center frequency. The peak output power into a 100 Omega diff. load is 3.1 dBm with 53.6 dB SNDR. By adjusting the sample rate, carriers from 50 MHz to 1 GHz can be synthesized. RF signals up to 3 GHz can be synthesized when using the first image band. As an example, UMTS standard can be addressed by using a 2.6 GHz clock frequency. The measured ACPR is then 44 dB for a 5 MHz WCDMA channel at 1.95 GHz with output power of -16 dBm and 3.4% EVM. At 4 GHz clock frequency the total power consumption is 120 mW (49 mW for DeltaSigma modulator core) on a 1 V supply voltage, total die area is 3.2 mm2 (0.15 mm2 for the active area). |
Databáze: | OpenAIRE |
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