A 3.4-7 GHz Transformer-Based Dual-mode Wideband VCO

Bevilacqua, Andrea; Pavan, F.P.; Sandner, C.; Gerosa, A.; Neviani, A.

doi:10.1109/esscir.2006.307475

Cited by 43 publications

(36 citation statements)

References 7 publications

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“…Recently, multiple frequency peaks of high-order LC resonant tanks based on transformers or multi-tapped inductors are exploited to realize multi-band or wideband VCOs [10]- [16]. In [10] and [12], differential dual-band VCOs were introduced and demonstrated using transformers with small turn ratio and moderate coupling.…”

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: Introductionmentioning

confidence: 99%

“…In [10] and [12], differential dual-band VCOs were introduced and demonstrated using transformers with small turn ratio and moderate coupling. To cover a wide tuning range from 3.4 GHz to 7 GHz, one-port oscillator configuration was employed for the lower band mode while two-port oscillator configuration was used for the higher band mode.…”

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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“…However, this technique requires large silicon area and therefore increases the cost. Other techniques have been reported to widen the oscillator tuning range including VCOs exploiting switched inductors [2] and coupled inductors [3]- [6]. The VCOs based on switched inductors suffer from poor phase noise performance due to the loss of the switches inside the tank.…”

Section: Introductionmentioning

confidence: 99%

“…In a dual-band VCO with a 4 th -order resonator (two coupled LC tanks) in [3], to cover a frequency range of 6-12GHz, the required tuning range in each band needs to be ~40-50%. However, such a tuning range is still very difficult to achieve, especially at higher frequencies because of the trade-offs between phase noise, tuning range and power dissipation.…”

Section: Introductionmentioning

confidence: 99%

A 5.12–12.95GHz triple-resonance low phase noise CMOS VCO for software-defined radio applications

Bajestan

Entesari

2013

2013 IEEE Radio Frequency Integrated Circuits Symposium (RFIC)

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This paper presents a wide-tuning range Voltage-Controlled Oscillator (VCO) for software-defined radio (SDR) applications using a resonator with three potential oscillation modes. The implemented prototype in 0.18µm CMOS technology achieves a continuous tuning range of 86.7% from 5.12GHz to 12.95GHz while drawing 5 to 10mA current from 1-V supply. The measured phase noise at 1MHz offset from carrier frequencies of 5.9, 9.12 and 12.25GHz is -122.9, -117.1 and -110.5dBc/Hz, respectively. The VCO occupies a chip area of 0.33mm 2 .Index Terms -Low phase noise, multi-band, softwaredefined radio, voltage-controlled oscillator, wide tuning range.

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“…One such technique that has been of particular interest to researchers is that of using a transformer-based resonator [2]- [6]. Transformer-based (T-based) resonators have been demonstrated to improve the phase noise performance of VCOs [2], [3], and have also been used to realize high-order resonators in dual-band oscillators [4], [5]. It is often claimed that, all else being equal, a T-based resonator will improve the Q beyond that of a single inductorbased (L-based) resonator.…”

Section: Introductionmentioning

confidence: 99%

Analysis of transformer-based resonator quality factor and bandwidth and the implications to VCOs

El-Gouhary

Neihart

2011

2011 IEEE International Symposium of Circuits and Systems (ISCAS)

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This paper studies how the reflected impedance impacts the quality factor and noise performance of transformer-based resonators. The analysis shows that in oscillators employing transformer-based resonators, the improved noise performance does not primarily come from an increase in Q, but instead from a decrease in the bandwidth of the resonator as compared to that of an equivalent inductorbased resonator.

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A 3.4-7 GHz Transformer-Based Dual-mode Wideband VCO

Cited by 43 publications

References 7 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 5.12–12.95GHz triple-resonance low phase noise CMOS VCO for software-defined radio applications

Analysis of transformer-based resonator quality factor and bandwidth and the implications to VCOs

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A 3.4-7 GHz Transformer-Based Dual-mode Wideband VCO

Cited by 43 publications

References 7 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 5.12&#x2013;12.95GHz triple-resonance low phase noise CMOS VCO for software-defined radio applications

Analysis of transformer-based resonator quality factor and bandwidth and the implications to VCOs

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A 5.12–12.95GHz triple-resonance low phase noise CMOS VCO for software-defined radio applications