| Autor: |
Fujimaki, Akira, Nakazono, Koichi, Onogi, Masashi, Okada, Kiyokazu, Sekiya, Akito, Hayakawa, Hisao |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Applied Superconductivity; Jun2003 Part 1 of 3, Vol. 13 Issue 2, p492, 4p, 1 Diagram, 2 Charts, 3 Graphs |
| Abstrakt: |
We have numerically studied oversampling analog-to-digital converters (ADC's) in terms of sensitivity, spurious-free dynamic range, signal-to-noise ratio (SNR) or dynamic range toward the application to a future mobile communication system. These ADC's are based on single-flux-quantum logic. The sensitivity depends on the impedance of the grounded element, while the SNR is less dependent on the architecture of the modulator. A band-pass Σ-Δ. modulator is suitable for digital RF radios due to its high sensitivity. The second-order modulator with a feedback gain of 20 and 50 GHz-operation of the single-loop modulator show the same effect on the improvement of SNR. Further improvement required for the digital RF architecture can be realized by using a multi-bit comparator or by higher operating speed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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