Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 81 for “"VCO"”.
-
Low phase-noise VCO design
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
-
Design of a High Temperature GaN-Based VCO for Downhole Communications
… the rise. This paper presents a high temperature VCO for downhole communication system. The proposed VCO is designed and prototyped using 0.25 μm GaN on SiC RF transistor which has extremely high junction temperature capability. Measurements show that the proposed VCO can operate reliably under …
-
A 5-6 Ghz Silicon-Germanium Vco With Tunable Polyphase Outputs
… (LC) tank voltage controlled oscillator (VCO) with tunable polyphase outputs. Circuits were designed and fabricated using the Motorola 0.4 ìm CDR1 SiGe BiCMOS process, which has four interconnect metal layers and a thick copper uppermost bump layer for high-quality radio frequency (RF) …
-
A 1.8-Ghz CMOS Fractional -N Frequency Synthesizer With Randomized Multiphase VCO
… frequency synthesizer with randomized multiphase VCO was designed. The prototype, implemented in a standard 0.6-mum CMOS technology, achieves -118 dBc/Hz phase noise at 1-MHz offset and exhibits close-in phase noise between -80 and -90 dBc/Hz up to the PLL loop bandwidth. The synthesizer has a …
-
A 4th order continuous-time [Delta] [Epsilon] ADC with VCO-based integrator and quantizer
The use of a VCO-based integrator and quantizer within a continuous-time (CT) [Delta] [Epsilon] analog-to-digital converter (ADC) structure is explored, and a custom prototype in a 0.13 [mu]m CMOS with a measured performance of 81.2/78.1 dB SNR/SNDR over a 20 MHz bandwidth while consuming 87 mW …
-
A Novel Variable Inductor-Based VCO Design with 17% Frequency Tuning Range for IEEE 802.11AD Applications
… of a novel variable inductor (VID) based VCO solution to the frequency tuning range (TR) limitation of the IEEE 802.11ad compliant radio systems. The IEEE 802.11ad standard has drawn strong attention from the industry as the next generation affordable multi-gigabit speed wireless …
-
Switched-Tank VCO Designs and Single Crystal Silicon Contour-Mode Disk Resonators for use in Multiband Radio Frequency Sources
… - 5.25 GHz; 5.25-5.35 GHz; and 5.725-5.825 GHz. VCOs that can be switched between each of the three UNII sub-bands offer flexibility and optimum phase-locked loop (PLL) design versus non-switchable VCOs. This work presents switched-tank voltage controlled oscillators (VCOs) designed in Motorolaà …
-
Design and analysis of high performance low noise oscillators and phase lock loops
… two fundamental clock generation circuits – the VCO and PLL.<br/><br/>An improved ring oscillator topology is proposed which has the advantage of an ultra wide tuning range. A novel noise aware ring oscillator model is also proposed which links the noise performance of the oscillator to its …
-
Modelling and applications of MOS varactors for high-speed CMOS clock and data recovery
… 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 filtering characteristic of the LC …
-
Gas exchange kinetics in elite runners.
… (Essfeld et al. 1987). Carbon dioxide output (VCO[2] ) kinetics have been shown to be delayed following 6 months sprint and strength training in footballers (Fukuoka et al 1997) and might also, therefore, be expected to differentiate subjects according to their aerobic fitness. The purpose of …
-
Analysis and Design of Wide Tuning Range Low Phase Noise mm-wave LC-VCOs
… the LC-voltage controlled oscillator (LC-VCO), is required to have low phase noise while maintaining wide tuning range to achieve low bit error rates (BERs). Due to the large parasitic capacitance and high losses in silicon based technologies, extending the tuning range and reducing phase …
-
Time-based circuits for communication systems in advanced CMOS technology
… deep sub-micron CMOS processes. We introduce a VCO-based [sigma][delta] A/D converter utilizing a voltage-controlled ring oscillator (ring VCO) as a continuous-time integrator. We propose to replace conventional integrators designed with analog circuits in a [sigma][delta] modulator with a ring …
-
A Fully Monolithic 2.5 GHz LC Voltage Controlled Oscillator in 0.35 μm CMOS Technology
… 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 realized, RF circuits must be …
-
The design and implementation of a new wide-range frequency detector
… frequency detector to accurately lock the VCO to the incoming data rate. The new detector consists of two halves: one to detect when the VCO is too fast, and one to detect when the VCO is too slow. The design and analysis of the new frequency detectors, in addition to a method for …
-
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 …
-
Phase Noise in CMOS Phase-Locked Loop Circuits
… using LC voltage-controlled oscillator (VCO) and a low power dual-modulus prescaler. The LC VCO working range is from 900MHz to 1.4GHz. Current mode logic (CML) is used in designing high speed D flip-flop in the dual-modulus prescaler circuits for low power consumption. The power …
-
RF signal inductors in iUHD for voltage controlled oscillators in configurable RF integrated circuits
… 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 circuits by increasing the maximum …
-
A VHF/UHF Voltage Controlled Oscillator in 0.5um BiCMOS
… 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 process. IBM 5S is a 0.5 um, single …
Page 1 of 5