| Autor: |
Kaehlert, Stefan, Bormann, Dirk, Werth, Tobias D., Wei, Muh-Dey, Liao, Lei, Heinen, Stefan |
| Zdroj: |
2012 IEEE Radio & Wireless Symposium; 1/ 1/2012, p13-16, 4p |
| Abstrakt: |
Frequency agile filters are key components for future cognitive radio applications. Bandpass filters based on the principle of lowpass upconversion allow simple and CMOS-friendly solutions to cognitive radio filter problems. Because the center frequency depends on the LO-frequency only, the band selection is adjusted with the receive mixers LO simultaneously. A frequency agile filter has been incorporated into a 600 MHz to 800 MHz wideband LNA with a gain of 18 dB at 700 MHz. It consumes 8.7 mA from a 1.4 V supply. With a 3 dB-bandwidth of 14 MHz, the filter achieves a selectivity of 9.5 dB at 40 MHz frequency offset. Measurement results of a prototype chip in 90 nm CMOS prove the presented theory. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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