A 1.1-GHz CMOS fractional-N frequency synthesizer with a 3-bthird-order ΔΣ modulator |
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| Authors: | Rhee W. Song B.-S. Ali A. |
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| Affiliation: | Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL; |
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| Abstract: | A 1.1-GHz fractional-N frequency synthesizer is implemented in 0.5-μm CMOS employing a 3-b third-order ΔΣ modulator. The in-band phase noise of -92 dBc/Hz at 10-kHz offset with a spur of less than -95 dBc is measured at 900.03 MHz with a phase detector frequency of 7.994 MHz and a loop bandwidth of 40 kHz. Having less than 1-Hz frequency resolution and agile switching speed, the proposed system meets the requirements of most RF applications including multislot GSM, AMPS, IS-95, and PDC |
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