A Compact Wideband Front-End Using a Single-Inductor Dual-Band VCO in 90 nm Digital CMOS

Borremans, Jonathan; Bevilacqua, Andrea; Bronckers, Stephane; Dehan, M.; Kuijk, Maarten; Wambacq, Piet; Craninckx, Jan

doi:10.1109/jssc.2008.2004865

Cited by 47 publications

(33 citation statements)

References 36 publications

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“…Within a narrow bandwidth around , the characteristic and thus the noise shaping property of a transformer-based LC tank are the same as a second-order LC tank. With the general definition of tank Q [15], [21], [22], the high-order tank can be equivalently treated as a single capacitor in parallel with an effective inductor, like in Fig. 1(c).…”

Section: Phase Noisementioning

confidence: 99%

“…Making use of transformers with large turn ratio and high coupling, [14] demonstrates a 4 GHz/10 GHz dual-band Q-VCO and shows that one-port oscillators can be stabilized with a notch-peak cancellation technique. With a single multi-tapped inductor and based on two-port oscillations, [15] demonstrates a 3.5 GHz/10 GHz dual-band differential VCO for area-efficient wideband applications. Employing a loosely-coupled 3-coil transformer and based on one-port oscillations, [16] exhibits a triple-mode wideband VCO tunable from 1.28 GHz to 6.06 GHz.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Design of Transformer-Based Dual-Band VCO for Software-Defined Radios

Rong

Luong

2012

IEEE Trans. Circuits Syst. I

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This work presents complete analysis of both oneport and two-port dual-band oscillators using transformer-based fourth-order LC tanks, from which critical parameters including oscillation frequency, start-up condition, tank Q, phase noise-are thoroughly derived and compared. 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. On the other hand, compared to one-port oscillators, two-port oscillators need to consume more power to obtain the same output swing, but their phase noise can be improved more linearly with increasing bias current, and thus they can achieve lower phase noise with a sufficiently large bias current. Based on the results, 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, in which the two-port topology is used in the low band for low phase noise and the one-port topology is employed in the high band for low power consumption. The prototype achieves a dual-band operation with in-phase and quadrature-phase (IQ) output signals from 2.7 GHz to 4.3 GHz and from 8.4 GHz to 12.4 GHz. At 3.6 GHz and 10.4 GHz, phase noise at 3 MHz offset of dBc/Hz and dBc/Hz and sideband-rejection ratios (SBR) of 37 dB and 41 dB are measured, respectively.

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Section: Phase Noisementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Transformer-Based Dual-Band VCO for Software-Defined Radios

Rong

Luong

2012

IEEE Trans. Circuits Syst. I

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“…Along this line, we can analyze the resonator in Fig. 14. To get more insight from this derivation, we define the effective capacitance for each LC tank and the neutral resonant frequency as (11) (12) (13) Furthermore, we define the capacitive and inductive coupling factors to be (14) (15) with and , and define the asymmetry factors to be (16) …”

Section: Discussion On General Coupled Lc Resonatorsmentioning

confidence: 99%

“…4, this "inductance switching" relaxes the constrains of phase noise at high frequency and power consumption at low frequency, and reduces current variation across the wide tuning range. Coupling LC tanks through transformer to get oscillation at two different frequencies was originally proposed by Bevilacqua et al [12], and there has been active research along this line to generate multiple frequency bands far apart [13]- [15], [18], [19], [23]. However, the impedance and quality factor of the resonator change significantly from mode to mode, which leads to inferior phase noise performance in one or more of the bands.…”

Section: Introductionmentioning

confidence: 99%

A Low-Phase-Noise Wide-Tuning-Range Oscillator Based on Resonant Mode Switching

Liu

Tang

et al. 2012

IEEE J. Solid-State Circuits

153

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In this paper we will present a low-phase-noise wide-tuning-range oscillator suitable for scaled CMOS processes. It switches between the two resonant modes of a high-order LC resonator that consists of two identical LC tanks coupled by capacitor and transformer. The mode switching method does not add lossy switches to the resonator and thus doubles frequency tuning range without degrading phase noise performance. Moreover, the coupled resonator leads to 3 dB lower phase noise than a single LC tank, which provides a way of achieving low phase noise in scaled CMOS process. Finally, the novel way of using inductive and capacitive coupling jointly decouples frequency separation and tank impedances of the two resonant modes, and makes it possible to achieve balanced performance. The proposed structure is verified by a prototype in a low power 65 nm CMOS process, which covers all cellular bands with a continuous tuning range of 2.5-5.6 GHz and meets all stringent phase noise specifications of cellular standards. It uses a 0.6 V power supply and achieves excellent phase noise figure-of-merit (FoM) of 192.5 dB at 3.7 GHz and 188 dB across the entire tuning range. This demonstrates the possibility of achieving low phase noise and wide tuning range at the same time in scaled CMOS processes.Index Terms-Coupled oscillator, dual band, low phase noise, mode switching, VCO, wide tuning range oscillator.

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“…Different techniques are possible to design a wideband VCO: transformer based VCOs [3], frequency translation (division, multiplication, injection locking) [4], multiple VCOs [5], switched inductors based VCOs [6], multiple inductors based VCOs [7], inductor reuse based VCOs [8]. These tuning techniques are commonly adopted at low frequencies and there is a great interest in adopting similar approaches at higher frequencies.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of wideband distributed VCOs based on switched-cells tuning technique

Cannone

Avitabile

2015

Analog Integr Circ Sig Process

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The paper discusses a VCO belonging to the class of Distributed-VCOs (DVCOs) designed for wide tuning range operations. The trade-off between wide bandwidth and phase noise is central to the proposed design and the paper covers the DVCO topology and discusses its operations in detail, starting by the general conditions of oscillation and covering the applied tuning techniques. In particular the paper reports a description of the so called ''switched-cells tuning technique''. The design of a fully integrated DVCO is reported. It is based on the ''switched-cells tuning technique'' and provides the following measured tuning ranges over four sub-bands: 219 MHz around 900, 291 MHz around 1.5 GHz, 392 MHz around 1.8 GHz and 199 MHz around 2.4 GHz. The DVCO performances are discussed and compared with other similar implementation reported in the recent literature showing the potentialities of the proposed approach. According to the reported theory, the results show the applicability of the proposed Distributed VCOs for wide bandwidth applications.

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A Compact Wideband Front-End Using a Single-Inductor Dual-Band VCO in 90 nm Digital CMOS

Cited by 47 publications

References 36 publications

Analysis and Design of Transformer-Based Dual-Band VCO for Software-Defined Radios

Analysis and Design of Transformer-Based Dual-Band VCO for Software-Defined Radios

A Low-Phase-Noise Wide-Tuning-Range Oscillator Based on Resonant Mode Switching

Analysis and design of wideband distributed VCOs based on switched-cells tuning technique

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