| Autor: |
Oshima, Takashi, Maio, Kenji, Hioe, Willy, Shibahara, Yoshiyuki |
| Předmět: |
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| Zdroj: |
IEEE Journal of Solid-State Circuits; Nov2004, Vol. 39 Issue 11, p2052-2054, 3p, 1 Black and White Photograph, 4 Diagrams, 1 Graph |
| Abstrakt: |
A novel automatic tuning method for RC filters is proposed for CMOS low-IF transceivers. The method is based on a digital-DLL-like technique and tunes the time constant of filters automatically. The tuning range and the tuning accuracy are analyzed theoretically. To verify the method, a sixth-order 2-MHz IF filter for Bluetooth and a tuning circuit were fabricated in 0.18-µm CMOS. The tuning circuit occupying 0.066 mm² includes only a reference first-order filter, a comparator, and a simple digital circuit. The measurement result of the filter and the tuning circuit shows that the maximum ±28% time-constant variation can be tuned within ±5% accuracy, which is consistent with theoretical results. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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