Programmable high frequency RC oscillator

Bala, F.; Nandy, Tapas

doi:10.1109/icvd.2005.70

Cited by 30 publications

(8 citation statements)

References 2 publications

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“…(c) Temperature-dependent oscillation frequency output of VCO with a sensitivity as high as 12.2 MHz/°C or 0.081 °C/MHz (dark blue line is the linear fit with r 2 ∼ 0.998) and the stable output peak-to-peak voltage amplitude larger than 0.1 V. (d) Comparison of the energy per cycle of this work with published results. Red stars represent this work under V dd = 3 V, blue stars represent oscillators based on conventional silicon technology, and green stars represent the calculated results from the EDP and intrinsic gate delay of the best 10 nm gate length CMOS CNT devices. ,− …”

Section: Resultsmentioning

confidence: 99%

“…We compare the energy efficiency of our VCO circuits with that of the reported Si CMOS oscillator ICs, as shown in Figure d and Figure S9 and Table S1. CNT-based CMOS VCOs present better dynamic energy efficiency than most Si CMOS oscillators with similar gate lengths (or number of technology nodes). ,− Notably, our VCOs are far from optimized in terms of the number of transistors and the circuit design. If using optimized CNT CMOS FETs with scaled L g of 10 nm to construct the VCOs, the ultimate sub-10 fJ/cycle would be achieved, indicating the great potential and advantages of CNT CMOS ICs regarding dynamic energy consumption.…”

Section: Resultsmentioning

confidence: 99%

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Carbon Nanotube Complementary Gigahertz Integrated Circuits and Their Applications on Wireless Sensor Interface Systems

et al. 2019

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Along with ultralow-energy delay products and symmetric complementary polarities, carbon nanotube field-effect transistors (CNT FETs) are expected to be promising building blocks for energy-efficient computing technology. However, the work frequencies of the existing CNT-based complementary metal-oxide-semiconductor (CMOS) integrated circuits (ICs) are far below the requirement (850 MHz) in state-of-art wireless communication applications. In this work, we fabricated deep submicron CMOS FETs with considerably improved performance of n-type CNT FETs and hence significantly promoted the work frequency of CNT CMOS ICs to 1.98 GHz. Based on these high-speed and sensitive voltage-controlled oscillators, we then presented a wireless sensor interface circuit with working frequency up to 1.5 GHz spectrum. As a preliminary demonstration, an energy-efficient wireless temperature sensing interface system was realized combining a 150 mAh flexible Li-ion battery and a flexible antenna (center frequency of 915 MHz). In general, the CMOS-logic high-speed CNT ICs showed outstanding energy efficiency and thus may potentially advance the application of CNT-based electronics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Carbon Nanotube Complementary Gigahertz Integrated Circuits and Their Applications on Wireless Sensor Interface Systems

et al. 2019

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“…Further developments for the lower MHz band are given in [21] and [22], whereas frequencies up to 6 MHz are achieved with a respectable power consumption. All these designs are optimized for low-power applications with temperature stable frequencies, whereas the utilized area was not the main focus.…”

Section: B Low Frequency Dcosmentioning

confidence: 99%

Embedded low power clock generator for sensor nodes

Schrape

Vater

2012

Norchip 2012

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In this paper an embedded clock generation solution for low power sensor nodes is presented. A design example of a Digitally Controlled Oscillator (DCO) is given and compared to other approaches. The paper discusses the most common clock architectures for sensor nodes, their design challenges and potential integration issues. The proposed DCO is adjustable to 64 different frequencies in the range of 5.8 MHz to 13.9 MHz fed by a 2.5 V voltage supply. With an area utilization of 0.024 mm 2 in a 0.25 µm SiGe BiCMOS process, and an average current consumption of less than 106 µA, it fits best into power-area trade off for an internal several-MHz clock generator. It is designed as an IP-Core and can be placed directly into the digital core of a sensor node. Due to its robustness, the DCO can be connected to the noisy digital voltage supply. A test chip was sent to fabrication.

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“…(2) RC Oscillators [15]. Here the time constant associated with charging a capacitance over a resistor is used as a time reference.…”

Section: Related Workmentioning

confidence: 99%

On Self-Timed Circuits in Real-Time Systems

Ferringer

2011

International Journal of Reconfigurable Computing

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While asynchronous logic has many potential advantages compared to traditional synchronous designs, one of the major drawbacks is its unpredictability with respect to temporal behavior. Having no high-precision oscillator, a self-timed circuit's execution speed is heavily dependent on temperature and supply voltage. Small fluctuations of these parameters already result in noticeable changes of the design's throughput and performance. Without further provisions this jitter makes the use of asynchronous logic hardly feasible for real-time applications. We investigate the temporal characteristics of self-timed circuits regarding their usage in real-time systems, especially the Time-Triggered Protocol. We propose a simple timing model and elaborate a self-adapting circuit which shall derive a suitable notion of time for both bit transmission and protocol execution. We further introduce and analyze our jitter compensation concept, which is a threefold mechanism to keep the asynchronous circuit's notion of time tightly synchronized to the remaining communication participants. To demonstrate the robustness of our solution, we perform different tests and investigate their impact on jitter and frequency stability.

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Programmable high frequency RC oscillator

Cited by 30 publications

References 2 publications

Carbon Nanotube Complementary Gigahertz Integrated Circuits and Their Applications on Wireless Sensor Interface Systems

Carbon Nanotube Complementary Gigahertz Integrated Circuits and Their Applications on Wireless Sensor Interface Systems

Embedded low power clock generator for sensor nodes

On Self-Timed Circuits in Real-Time Systems

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