A new adaptation scheme for low noise and fast settling phase locked loops (PLL’s) is presented. Extended loop bandwidth enhancement is achieved by the adaptive control on the reference frequency and frequency divide ratio. It enables the loop bandwidth in the speed-up mode to greatly exceed the limit of approximately 1/10 of the channel spacing in the integer frequency synthesizer. Based on th...

In this paper, an overview of the stochastic modeling for analysis/synthesis of noisy sounds is presented. In particular, we focused on the time-frequency domain synthesis based on the inverse fast Fourier transform (IFFT) algorithm from which we proposed the design of a spatialized synthesizer. The originality of this synthesizer remains in its one-stage architecture that efficiently combines ...

In this paper, the divider circuit for PLL based Frequency Synthesizer has been designed. In the divider circuit, three types of counters have been used namely Prescaler, Main Counter and Swallow Counter. The Divider circuit is a two modulus Divider and it can be used to divide by any value in the range 4635 to 4650 as per the requirement. It uses a two modulus Prescaler and it has two modes of...

MARKS, JEFFERY EARL. SOI for Frequency Synthesis in RF Integrated Circuits. (Under the direction of Dr. Wentai Liu.) The purpose of this research has been to explore the use of the Honeywell silicon on insulator fabrication process for use in a frequency synthesizer. The research includes the fabrication of a frequency synthesizer and ring oscillators which are used to evaluate the fabrication ...

An effective technique for phase noise improvement in a fractional-N synthesizer is described. The method requires using in a 90" phase shift lock a non-linear continuous-time or sampled-data block before the loop filter. Behavioral simulations on a fractional-N synthesizer incorporating different non-linear blocks and a second-order single bit sigma delta modulator show that it is possible to ...

A low-power fully-integrated type-2 4'h-order 1.7GHz CMOS frequency synthesizer for DCS1800 application is designed and simulated in a 0.25pm process technology. The frequency switching is achieved using a novel architecture exploiting a direct digital synthesis (DDS) device as the frequency reference. The new topology significantly lowers the undesired sideband power due to divider ratio switc...

To dramatically reduce the need for Silicon frequency synthesizer is always measured in integer mode reproduction due to poor noise performance, a close-loop first and then measured in fractional mode. The fractional simulation platform that combines both measured and/or mode would yield the same phase noise performance when simulation results of open-loop PLL sub-blocks has been compared to th...

A prescaler is widely used in frequency synthesizers in order to handle channel selection. The division ratio has to be chosen carefully to achieve the desired frequency. In this paper, we present a 6 modulus prescaler in a 0.18 μm SiGe BiCMOS technology. The prescaler is part of a 60 GHz frequency synthesizer. In addition, we present a frequency planning for the 60 GHz frequency synthesizer. T...

A low-power fully-integrated type-2 4-order 1.7GHz CMOS frequency synthesizer for DCS-1800 application is designed and simulated in a 0.25μm process technology. The frequency switching is achieved using a novel architecture exploiting a direct digital synthesis (DDS) device as the frequency reference. The new topology significantly lowers the undesired sideband power due to divider ratio switch...

In the past decade we have witnessed remarkable advances associated with the frequency stabilization of the comb present in the output of a mode-locked femtosecond laser. While proving itself to be fantastically successful in its role as the “gears” of optical atomic clocks, the optical frequency comb has further evolved into a valuable tool for a wide range of applications, including ultraviol...