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Titolo:
A 2-V 2.5-GHz-104-dBc/Hz at 100 kHz fully integrated VCO with wide-band low-noise automatic amplitude control loop
Autore:
Zanchi, A; Samori, C; Levantino, S; Lacaita, AL;
Indirizzi:
Politecn Milan, Dipartimento Elettr & Informaz, I-20133 Milan, Italy Politecn Milan Milan Italy I-20133 ettr & Informaz, I-20133 Milan, Italy CNR, CEQSE, I-20133 Milan, Italy CNR Milan Italy I-20133CNR, CEQSE, I-20133 Milan, Italy
Titolo Testata:
IEEE JOURNAL OF SOLID-STATE CIRCUITS
fascicolo: 4, volume: 36, anno: 2001,
pagine: 611 - 619
SICI:
0018-9200(200104)36:4<611:A22A1K>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHASE NOISE; OSCILLATORS;
Keywords:
AM-PM conversion; bipolar transistor oscillators; integrated circuits design; integrated circuits noise; oscillators; phase noise; voltage controlled oscillators;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Zanchi, A Texas Instruments Inc, Dallas, TX 75243 USA Texas Instruments Inc Dallas TX USA 75243 Dallas, TX 75243 USA
Citazione:
A. Zanchi et al., "A 2-V 2.5-GHz-104-dBc/Hz at 100 kHz fully integrated VCO with wide-band low-noise automatic amplitude control loop", IEEE J SOLI, 36(4), 2001, pp. 611-619

Abstract

The automatic amplitude control (AAC) loop is an indispensable element forthe practical realization of VCOs embedded in a complete transceiver. Its noise however can unacceptably degrade the single-sideband-to-carrier ratio(SSCR) performance of the oscillator, this problem being even exacerbated in low-voltage circuits. This paper addresses the design issues of a low-voltage low-noise differential LC-VCO with AAC, tunable within a 2.3-2.8-GHz frequency range, fully integrated in bipolar technology with 2-V power supply. First, the mechanisms through which the AAC noise affects the output phaseare identified as the poor indirect stability and the AM-to-PM conversion due to the varactors. The effect of the AAC noise is discussed and substantially reduced with suitable design choices. We show that the achievable noise-to-signal ratio is bounded by the shot noise coming from the bias sourceof the differential oscillator, an intrinsic limit set by the low supply voltage which does not allow for degeneration of the tail transistor. Second, the design of the AAC is discussed. A large gain-bandwidth product (GBWP), about 100 MHz, has been implemented in order to correct for the fast oscillation amplitude variations and reduce the effect of the ground line disturbances. The expected value of the phase noise level, SSCR at 100 kHz = -104 dBc/Hz, is tightly matched by the experimental results. The core oscillator dissipates 7 mA, while less than 600 muA are drawn by the AAC circuit.

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Documento generato il 20/09/20 alle ore 05:23:11