Journal ArticleDOI
Dual-Band LC VCO Architecture With a Fourth-Order Resonator
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TLDR
A dual-band LC voltage-controlled oscillator (VCO) architecture suitable for GSM/PCS/DCS applications is presented that utilizes a fourth-order resonance tank and avoids quality-factor-deteriorating switches.Abstract:
A dual-band LC voltage-controlled oscillator (VCO) architecture suitable for GSM/PCS/DCS applications is presented. The VCO utilizes a fourth-order resonance tank and avoids quality-factor-deteriorating switches. The paper outlines the design tradeoffs and the VCO when using a fourth-order resonator. The 0.8-GHz/1.8-GHz test chip was fabricated in the 0.5-mum IBM-5AM SiGe process and has achieved phase noise of -134 dBc/Hz at a 1-MHz frequency offset from the carrier, with 56-MHz and 121-MHz tuning ranges in the corresponding bands. The VCO core consumes 15 mW from a 2.5-V power supplyread more
Citations
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Journal ArticleDOI
Wideband Multi-Mode CMOS VCO Design Using Coupled Inductors
Z. Safarian,Hossein Hashemi +1 more
TL;DR: Compared with conventional switched-resonator-based approaches that consume the same chip area, the proposed coupled-inductor-based resonator results in larger quality-factor, and hence, lower oscillator phase noise, in the proposed multi-mode oscillator that uses the multi-port coupled inductors.
Journal ArticleDOI
Analysis and Design of Transformer-Based Dual-Band VCO for Software-Defined Radios
Sujiang Rong,Howard C. Luong +1 more
TL;DR: It is shown that one-port oscillators consume less power than two-port counterparts but may suffer from stability problem which can be solved by a notch-peak cancellation technique, and a dual-band quadrature voltage- controlled oscillator (Q-VCO) is systematically designed and implemented in a 0.13- m CMOS process for software-defined -radio (SDR) applications.
Journal ArticleDOI
A Dual-Band CMOS Voltage-Controlled Oscillator Implemented With Dual-Resonance LC Tank
TL;DR: In this article, a dual-band CMOS voltage controlled oscillator (VCO) is presented, which is composed of n-core cross-coupled Colpitts VCOs and implemented in 0.18 V supply voltage.
Journal ArticleDOI
A Compact Wideband Front-End Using a Single-Inductor Dual-Band VCO in 90 nm Digital CMOS
Jonathan Borremans,Andrea Bevilacqua,S. Bronckers,Morin Dehan,Maarten Kuijk,Piet Wambacq,Jan Craninckx +6 more
TL;DR: A wideband front-end is presented that uses an inductorless LNA and downconversion section up to 6 GHz and in-depth analysis describes the operation of the 4-port oscillator, and compares phase noise to that of a classical VCO.
Journal ArticleDOI
A Distributed Dual-Band LC Oscillator Based on Mode Switching
Guansheng Li,Ehsan Afshari +1 more
TL;DR: In this article, the authors presented a distributed dual-band LC oscillator suitable for low-phase-noise applications, which switches between the odd and even resonant modes of a fourth-order LC resonator.
References
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A study of phase noise in CMOS oscillators
TL;DR: In this paper, the phase noise in two inductorless CMOS oscillators is analyzed and a new definition of phase noise is defined, and two prototypes fabricated in a 0.5/spl mu/m CMOS technology are used to investigate the accuracy of the theoretical predictions.
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A filtering technique to lower LC oscillator phase noise
TL;DR: Based on a physical understanding of phase-noise mechanisms, a passive LC filter was found to lower the phasenoise factor in a differential oscillator to its fundamental minimum in this paper.
Proceedings ArticleDOI
RF-CMOS oscillators with switched tuning
TL;DR: In this article, the authors proposed a tuning method for fully integrated CMOS oscillators with a wide enough tuning range to reliably cover process variations, without compromising current drain or phase noise.
Book
The Circuits And Filters Handbook
TL;DR: This reference eschews extensively detailed theory to concentrate on professional applications with numerous examples provided throughout the set, which includes more than 2500 illustrations and hundreds of references.
Journal ArticleDOI
A low-phase-noise and low-power multiband CMOS voltage-controlled oscillator
TL;DR: In this article, a low voltage multiband allpMOS VCO was fabricated in a 0.18/spl mu/m CMOS process using a combination of inductor and capacitor switching, four band operation was realized using a single VCO.