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Showing 1 to 20 of 22 for “"Voltage-controlled oscillator (VCO)"”.
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RF signal inductors in iUHD for voltage controlled oscillators in configurable RF integrated circuits
… performance parameters are used to design a voltage controlled oscillator (VCO) meeting 802.1 lb wireless specifications. The design demonstrates the importance of inductor quality factor in minimizing phase noise. It is also shown that further improvements can be made to RF integrated …
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Automatic generation of an LC voltage controlled oscillator
A Voltage Controlled Oscillator (VCO) is used to generate a signal with a frequency that is a function of an input voltage amplitude, and is an integral part of circuits such as phase locked loops, frequency synthesizers, down conversion receivers, and clock generators. A typical design flow for a …
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Substrate noise analysis and techniques for mitigation in mixed-signal RF systems
… thus making them susceptible to substrate voltage variations. This problem is exacerbated at higher frequencies as the effectiveness of standard isolation technique diminishes considerably. Historically, substrate noise was not a problem because each system was fabricated in its own package …
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On-chip Spiral Inductor/transformer Design And Modeling For Rf Applications
… (RF) IC's such as low-noise amplifiers and oscillators. High performance inductor has become one of the critical components for voltage controlled oscillator (VCO) design, for its quality factor (Q) value directly affects the VCO phase noise. The optimization of inductor layout can improve …
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Fast Chirped Signals for a TDMA Ultrasonic Indoor Positioning System
… frequency detection can be done on the voltage-controlled oscillator (VCO) of the PLL, which has a narrower bandwidth than the overall signal sweep. The instantaneous frequency estimation methods are largely explored in this work and consider two methods: the Hilbert transform and a …
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An on-chip test circuit for characterization of MEMS resonators
… loops, simplifying the design. Finally, a voltage-controlled oscillator (VCO) based analog-to-digital converter (ADC) is implemented on-chip that converts the measured signal into digital codes enabling complete digital interface, which is an important feature for test automation. …
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Techniques for high-performance digital frequency synthesis and phase control
… digital loop filter and a conventional hybrid voltage-controlled oscillator (VCO) to create a digitally-controlled oscillator (DCO). An asynchronous divider structure is presented which lowers the required TDC range and avoids the divide-value-dependent delay variation. The prototype is …
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Modelling and applications of MOS varactors for high-speed CMOS clock and data recovery
… Of these blocks, we have identified the voltage-controlled oscillator (VCO) as an important circuit that contributes to the total noise performance of the CDR. Among different solutions known for this circuit, LC-VCO is acknowledged to have the best phase noise performance, due to the …
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Design and modelling of clock and data recovery integrated circuit in 130 nm CMOS technology for 10 Gb/s serial data communications
… CDR circuits. An eight-stage differential ring oscillator running at 2.5 GHz frequency center was used for the voltage-controlled oscillator (VCO) to generate low-jitter multi-phase clock signals. The transistor level simulation results demonstrated excellent performances in term of locking …
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TECHNOLOGIES TO IMPROVE GAN-BASED LLC RESONANT CONVERTER FOR WIDE INPUT VOLTAGE, HIGH OUTPUT CURRENT AC-DC AND DC-DC APPLICATIONS
… in industrial applications, including wide input voltage range, poor feedback performance, output current unbalance among multiply phases, and double line frequency ripple with power factor correction (PFC). Aiming at these issues, several solutions have been proposed. A single-stage LLC converter …
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Phase Noise in CMOS Phase-Locked Loop Circuits
… of noises from its building blocks: voltage-controlled oscillator, frequency divider, phase-frequency detector, loop filter and auxiliary input reference clock. A linear time invariant model with additive noise sources in frequency domain is presented to analyze the phase noise. The …
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Analog-digital co-existence in 3D-IC
… The use of a vertical solenoid inductor in a Voltage Controlled Oscillator (VCO) is proposed. The inductor design utilizes the through-silicon-vias of the 3D stack as part of its geometry. The solenoid inductor exhibits a 28%larger inductance and a 6 dB higher quality factor compared to a …
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A Fully Monolithic 2.5 GHz LC Voltage Controlled Oscillator in 0.35 μm CMOS Technology
… to implement RF components such as mixers, voltage controlled oscillators (VCOs), and low noise amplifiers (LNAs). Future mass-market RF links, such as BlueTooth, will require the potentially low-cost single-chip solutions that CMOS can provide. In order for such single-chip solutions to be …
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A Completely Integrated Warm-IF Receiver and a 10GS/s Analog-Delay Pipeline ADC for Radio-Telescope Applications
… including a low-noise amplifier (LNA), a voltage-controlled oscillator (VCO), a mixer, and a variable-gain amplifier (VGA), based on CHAI design requirements, was implemented in 0.13 μm complementary metal-oxide semiconductor (CMOS) technology. An analog-to-digital converter (ADC) was …
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Design and Analysis of a Low-Power Low-Voltage Quadrature LO Generation Circuit for Wireless Applications
… and low cost RF solutions. A quadrature local oscillator (LO) is an essential building block for most transceivers. As the CMOS technology scales deeper into the nanometer regime, design of a low-power low-voltage quadrature LO still poses a challenge for RF designers. This dissertation …
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A VHF/UHF Voltage Controlled Oscillator in 0.5um BiCMOS
… functions and lower frequency analog circuits. A voltage controlled oscillator (VCO) is just one radio frequency (RF) circuit block that can benefit from a more complex semiconductor process like BiCMOS. This thesis presents the design and evaluation of an integrated VCO in the IBM 5S BiCMOS …
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Study Of Oxide Breakdown, Hot Carrier And Nbti Effects On Mos Device And Circuit Reliability
… include low noise amplifier (LNA), local oscillator (LO) and mixer. It is desirable for a LNA to achieve high gain with low noise figure, a LO to generate low noise signal with sufficient output power, wide tuning range, and high stability, and a mixer to up-convert or down-convert the …
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High Performance RF Circuit Design: High Temperature, Ultra-Low Phase Noise, and Low Complexity
… of the circuit components (e.g. bias voltages), accordingly. Further, a new variable gain phase shifter (VGPS) architecture is introduced toward minimizing the temperature impact on its performance in a phased-array transmitter architecture. Finally, a power amplifier as the last stage …
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Circuits for time-domain signal processing
… lower output impedance, and reduced supply voltage have also brought new challenges especially to the design of analog circuits that typically operate in voltage/current domains. In this dissertation, circuits for processing the signal in the time-domain are explored where faster MOS …
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3D modeling and integration of current and future interconnect technologies
… density and high performance. A new design of a Voltage Controlled Oscillator (VCO) utilizing the TSV based inductor is also presented. The implementation of the VCO is intended to study the feasibility, performance, and real-world application of the proposed TSV based inductor.
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