A low power consumption CMOS differential-ring VCO for a wireless sensor

Thabet, Hanen; Meillere, S.; Masmoudi, Mohamed; Seguin, Jean-Luc; Barthélémy, H.; Aguir, Khalifa

doi:10.1007/s10470-012-9914-8

Cited by 15 publications

(7 citation statements)

References 8 publications

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“…Compared to [ 15 ], this ring-VCO has better phase noise and high value of FOM at the expense of modest power. Its power consumption is significantly lower than [ 12 – 14 , 16 ]; and finally, its wide tuning range is notable than other reported works except that of [ 13 ].…”

Section: Results and Comparisonsmentioning

confidence: 82%

Designing a Ring-VCO for RFID Transponders in 0.18 μm CMOS Process

Jalil

Reaz

Bhuiyan

et al. 2014

The Scientific World Journal

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In radio frequency identification (RFID) systems, performance degradation of phase locked loops (PLLs) mainly occurs due to high phase noise of voltage-controlled oscillators (VCOs). This paper proposes a low power, low phase noise ring-VCO developed for 2.42 GHz operated active RFID transponders compatible with IEEE 802.11 b/g, Bluetooth, and Zigbee protocols. For ease of integration and implementation of the module in tiny die area, a novel pseudodifferential delay cell based 3-stage ring oscillator has been introduced to fabricate the ring-VCO. In CMOS technology, 0.18 μm process is adopted for designing the circuit with 1.5 V power supply. The postlayout simulated results show that the proposed oscillator works in the tuning range of 0.5–2.54 GHz and dissipates 2.47 mW of power. It exhibits a phase noise of −126.62 dBc/Hz at 25 MHz offset from 2.42 GHz carrier frequency.

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Section: Results and Comparisonsmentioning

confidence: 82%

Designing a Ring-VCO for RFID Transponders in 0.18 μm CMOS Process

Jalil

Reaz

Bhuiyan

et al. 2014

The Scientific World Journal

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“…Calzolari et al [43] have summed up with a mathematical equation for the propagation delay τ d that can be calculated from the period of oscillation (T ) given in equation ( 1), [68], [74],…”

Section: Ring Vcomentioning

confidence: 99%

“…7. When the ring oscillator is designed with an even number of stages, and the output feed-backs are swapped and connected to the input [74], [76] depicted in Fig. 8 [76].…”

Section: Ring Vcomentioning

confidence: 99%

A Comparative Study of Ring VCO and LC-VCO: Design, Performance Analysis, and Future Trends

Sivaraaj,

Majeed

2023

IEEE Access

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Voltage-controlled Oscillator (VCO) is a prominent part that has been used to generate a stable frequency for the high-frequency transceiver system. This survey encompasses a comparative analysis of two commonly used VCO architectures: the Ring VCO and LC-VCO. The Ring VCO has been constructed with the collection of ring delay cells. Moreover, the LC-VCO utilizes inductors, capacitors, fine-tuning circuits, coarse-tuning circuits to generate frequency. Furthermore, this study investigates an in-depth exploration of VCO structures, operational principles, advantages, limitations, and performance metrics. In addition, it evaluates performance parameters, including operating frequency range, phase noise, figure of merit, and tuning techniques. This research suggests that based on the application and its requirements, the VCO performance parameters need to be varied. This survey employs diverse types of VCO, and its design methods. Implications for future research and study of VCO design and integration are discussed.

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“…Voltage-controlled oscillators (VCOs) are widely used in the design of sensor systems. VCOs are generally found in transceivers for ultra low-power wireless sensor networks (WSNs) where, in conjunction with the phase locked loop (PLL), are used for frequency synthesis, fast switching circuits, and clock recovery [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. VCOs are also a fundamental part of VCO-based reading circuits where the sensor core output voltage is applied to the VCO tuning voltage node, achieving high sensitivity and high signal-to-noise ratio compared to amplifier-based reading circuits [ 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

A New Current-Shaping Technique Based on a Feedback Injection Mechanism to Reduce VCO Phase Noise

Pino

Khemchandani

2021

Sensors

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Inductor-capacitor voltage controlled oscillators (LC-VCOs) are the most common type of oscillator used in sensors systems, such as transceivers for wireless sensor networks (WSNs), VCO-based reading circuits, VCO-based radar sensors, etc. This work presents a technique to reduce the LC-VCOs phase noise using a new current-shaping method based on a feedback injection mechanism with only two additional transistors. This technique consists of keeping the negative resistance seen from LC tank constant throughout the oscillation cycle, achieving a significant phase noise reduction with a very low area increase. To test this method an LC-VCO was designed, fabricated and measured on a wafer using 90 nm CMOS technology with 1.2 V supply voltage. The oscillator outputs were buffered using source followers to provide additional isolation from load variations and to boost the output power. The tank was tuned to 1.8 GHz, comprising two 1.15 nH with 1.5 turns inductors with a quality factor (Q) of 14, a 3.27 pF metal-oxide-metal capacitor, and two varactors. The measured phase noise was −112 dBc/Hz at 1 MHz offset. Including the pads, the chip area is 750 × 850 μm2.

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A low power consumption CMOS differential-ring VCO for a wireless sensor

Cited by 15 publications

References 8 publications

Designing a Ring-VCO for RFID Transponders in 0.18 μm CMOS Process

Designing a Ring-VCO for RFID Transponders in 0.18 μm CMOS Process

A Comparative Study of Ring VCO and LC-VCO: Design, Performance Analysis, and Future Trends

A New Current-Shaping Technique Based on a Feedback Injection Mechanism to Reduce VCO Phase Noise

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