1. Techniques for in-band phase noise reduction in [DELTA][SIGMA] synthesizers
- Author
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Riley, Thomas A.D., Filiol, Norman M., Du, Qinghong, and Kostamovaara, Juha
- Subjects
Bluetooth technology ,Business ,Computers and office automation industries ,Electronics ,Electronics and electrical industries - Abstract
This paper reviews several techniques used to reduce the in-band phase noise contribution of [DELTA][SIGMA] fractional-N frequency synthesizers. The paper develops several practical techniques for specifying the noise and linearity of components used in a [DELTA][SIGMA] fractional-N synthesizer. As an example, it presents a synthesizer with an in-band phase noise floor of -97 dBc/Hz@10 KHz for an RF output frequency of 2.432 GHz and a reference frequency of 16 MHz. The synthesizer has a frequency resolution of 61 Hz and an on-chip crystal oscillator. The synthesizer was implemented in a 0.35-/[micro]m SiGe process and consumes 6 mA from a 3 V supply. The in-band phase-noise, spurs, and power consumption of this synthesizer are each low and comparable to the state-of-the-art. Index Terms--Bluetooth, Delta-Sigma, frequency modulation (FM), frequency-shift keying (FSK), Gausian frequency shift keying (GFSK), GMSK minimum shift keying (MSK), general packet radio service (GPRS), global system for mobile communications (GSM), multimode, radio, satellite, Sigma-Delta, wireless.
- Published
- 2003