In present work, improved designs for voltage controlled ring oscillators (VCO) using three transistors XNOR/XOR gates have been presented. Supply voltage has been varied from [1.8 1.2] V in proposed designs. In first method, the VCO design using three XNOR delay cells shows frequency variation of [1.900 0.964] GHz with [279.429 16.515] μW power consumption variation. VCO designed with five XNO...

Current starved VCO is simple ring oscillator consisting of cascaded inverters. Differential ring oscillator has a differential output to reject common-mode noise, power supply noise and so on. In this paper we have designed and simulated Current Starved VCO and Differential VCO for PLL in Tanner 13.0v 0.18μm digital CMOS process. Performance comparison is done in terms of high oscillation freq...

This paper presents the design and analysis of a novel 2.4 GHz Voltage Controlled Oscillator (VCO), with amplitude control and Q enhancement circuit, for wireless communication applications. The variable capacitors and the inductors were designed using ANSYS and imported through DAC components in ADS (Advanced Design software). Accurate simulation of the VCO was performed in the software enviro...

In this paper, a 42GHz frequency synthesizer fabricated with 0.13μm SiGe BiCMOS technology is presented, which consists of an integer-N fourth-order type-II phase locked loop (PLL) with a LC tank VCO and a frequency doubler. The core PLL has three-stage current mode logic (CML) and five stage true single phase clock (TSPC) logic in the frequency divider. Meanwhile, a novel balanced common-base ...

Analysis and Design of Wideband LC VCOs by Axel Dominique Berny Doctor of Philosophy in Electrical Engineering and Computer Sciences University of California, Berkeley Professor Robert G. Meyer, Co-chair Professor Ali M. Niknejad, Co-chair The growing demand for higher data transfer rates and lower power consumption has had a major impact on the design of RF communication systems. In both wirel...

The 4G front-end transceiver needs a high performance which can be obtained mainly with an optimal architecture and a multi-band Local Oscillator. In this study, we proposed and presented a new architecture of multi-band frequency synthesizer based on an Inverse Sine Phase Detector Phase Locked Loop (ISPD PLL) without any filters and any controlled gain block and associated with adapted multi b...

This paper presents a quadrature voltage-controlled oscillator (QVCO) based on the coupling of two LC-tank VCOs. A simplified theoretical analysis for the oscillation frequency and phase noise displayed by the QVCO in the 1 3 region is developed, and good agreement is found between theory and simulation results. A prototype for the QVCO was implemented in a 0.35m CMOS process with three standar...

The thesis describes the motivation, design, layout and test of a voltage controlled oscillator (VCO), targeted for use in a dual frequency-hopped receiver configuration to be used for portable applications. The key requirements of this architecture are integration, low power and wide tuning range. Micromachined pas-sives enable low power operation through increased quality factors (Q) and wide...

A CMOS voltage controlled Op-Amp oscillator based on N-stage single-ended chain of different inverter types is described in this paper. This paper describes a performance and comparison of a ring oscillator based VCO and an Op-Amp based oscillator based VCO. The VCO is intended to operate in a op-amp based VCO to generate local oscillator frequency for an system. An oscillator topology an impro...

A multi-band CMOS LC Quadrature Voltage Control Oscillator (QVCO) with minimum power consumption is developed to meet the phase noise and frequency band requirements of RFID, Zigbee and Bluetooth standards. To accomplish the multi-band receiving architecture at low power consumption, current switching technique with optimized cross-coupled transistor sizes has been used. A comprehensive analysi...