A 1.3&amp;#x2013;6 GHz triple-mode CMOS VCO using coupled inductors

Coupled inductors can create multiple resonant frequencies in a compact high-order resonator. Together with proper nonlinear active circuitry, such a high-order resonator realizes a multi-mode oscillator covering a wide frequency range. 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, mode switching is achieved using independent active cores without using lossy switches in the resonator path. The behavior of the multi-mode resonator as a multiport network in an oscillator, design trade-offs, and switching transient response of the multi-mode oscillator have been studied analytically. As a proof of concept, an integrated voltage-controlled oscillator (VCO) with a 1.28-6.06 GHz tuning range is designed and fabricated in a 0.13 m CMOS technology. The triple-mode VCO uses a sixth-order resonator based on three coupled inductors with a compact common-centric layout. Depending on the oscillation frequency, the VCO current consumption is automatically adjusted from 2.9 to 6.1 mA to achieve a low phase noise throughout the frequency range. The measured phase noises at 1 MHz offset from carrier frequencies of 1.76, 2.26, 3.3, 4.5, and 5.6 GHz are 119.3, 120.15, 118.1, 117, and 113.5 dBc/Hz, respectively. The chip area, including the pads, is 1 mm 1 mm and the supply voltage is 1.5 V.Index Terms-CMOS, phase noise, voltage-controlled oscillator (VCO), wideband.

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“…The wideband VCO is implemented in a 0.13 m CMOS technology with 8 metal layers [2]. The total chip size, including the pads, is 1 mm 1 mm (Fig.…”

Section: Implementation and Measurement Resultsmentioning

confidence: 99%

“…Design guidelines towards optimizing the performance while maintaining a small power consumption throughout the entire tuning range are discussed. A 1.28-6.06 GHz triple-mode CMOS VCO using three coupled inductors is demonstrated as a proof of concept prototype [2].…”

Section: Introductionmentioning

confidence: 99%

Wideband Multi-Mode CMOS VCO Design Using Coupled Inductors

Safarian

Hashemi

2009

IEEE Trans. Circuits Syst. I

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“…Transformer networks where both the primary and secondary ports are terminated with capacitors have been used as high-order resonators in oscillator design (e.g., [30], [31]). These same transformer-based resonators can be used at the input of an LNA to provide a simultaneous dual-band impedance match.…”

Section: Dual-band Matching Using Transformersmentioning

confidence: 99%

A Dual-Band 2.45/6 GHz CMOS LNA Utilizing a Dual-Resonant Transformer-Based Matching Network

Neihart

Brown

2012

IEEE Trans. Circuits Syst. I

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This paper analyzes and presents design equations for a new transformer-based matching network capable of simultaneously matching two different frequencies. This network is then used to realize a dual-band low-noise amplifier that is fabricated in a 0.13 m CMOS process and is capable of operating at 2.45 GHz and 6 GHz. The measured and noise figure for 2.45 GHz (6 GHz) is 9.4 dB (18.9 dB) and 2.8 dB (3.8 dB), respectively. The IIP3 is measured to be and at 2.45 GHz and 6 GHz, respectively. The power consumption of the system (excluding the buffer) is 2.79 mW from a 1.2 V supply and the total area is m m.Index Terms-CMOS, low-noise amplifier (LNA), multistandard, reconfigurable.

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“…Voltage-controlled oscillators (VCOs) with wide tuning ranges are highly demanded for today's multi-standard and multiband communication systems to cut down the cost by reducing the required number of the VCO [1][2][3][4]. There are different ways to implement the VCO for wideband operation [5][6][7][8][9][10]. A ring type of oscillator has a wide tuning range but suffers from relative poor phase noise and larger power consumption [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Pohl et al achieved wideband VCO of 30% tuning range by using special designed varactors on a special process [9]. Safarian and Hashemi realized an even wider triple-mode VCO with coupled inductors and three discrete active VCO cores [10].…”

Section: Introductionmentioning

confidence: 99%

A Compact Size Low Power and Wide Tuning Range Vco Using Dual-Tuning Lc Tanks

Mou¹,

Ma²,

Yeo³

et al. 2012

PIER C

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A novel 12 GHz VCO designed and fabricated in a 0.18 µm SiGe BiCMOS technology is presented. Strongly magnetic coupled dual LC tanks with fixed and tunable capacitive elements are introduced to extend tuning range and improve phase noise. By hybrid using of varactor tuning, loaded transformer tuning and switched capacitor tuning, the proposed VCO achieves a wide tuning range of 4.3 GHz (36%) and output power of −9 dBm with only 4.5 mW power consumption and only 0.17 mm 2 chip area.

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A 1.3–6 GHz triple-mode CMOS VCO using coupled inductors

Cited by 17 publications

References 9 publications

Wideband Multi-Mode CMOS VCO Design Using Coupled Inductors

Wideband Multi-Mode CMOS VCO Design Using Coupled Inductors

A Dual-Band 2.45/6 GHz CMOS LNA Utilizing a Dual-Resonant Transformer-Based Matching Network

A Compact Size Low Power and Wide Tuning Range Vco Using Dual-Tuning Lc Tanks

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