1679 Words7 Pages

A New Phase Noise Detection Method
Yan Gang Feng1,2
1. School of Electronic Information Engineering,
Chengdu University, Chengdu, China
2. College of computer science,
Sichuan University, Chengdu, China
Email: scuygf@163.com
Abstract—Phase noise is one of the most important param- eters in many oscillators. Detecting accurately phase noise for oscillators has importance significance. In this paper, based on correlation operation detection phase noise for oscillators was proposed. The basic principle of this method is using the oscillation signal with phase noise through two phase detections, due to two phase detection channels is totally independent each other, their phase noise is uncorrelated, measured oscillators phase noise is also independent*…show more content…*

The measurement principle is shown in Fig. 1. I NTRODUCTION A variety of oscillators are widely used with the rapid development of information technology. Most importantly, the specifications of oscillator are critical in improving the perfor- mance of whole equipments and systems. The specification of phase noise is the most important one among all the parameters of oscillator [1-3]. Phase noise and short term frequency stability are two representations of the same physical phenomenon. Short term frequency stability is a time domain description. Phase noise is a frequency domain*…show more content…*

Phase noise is defined as the ratio of the single side-band power at a frequency offset of from the carrier with a measurement bandwidth of 1Hz to the carrier power [5,6]. If an emission excitation signal or a local oscillation signal contained phase noise, noise will likewise appear in receiving end in signal. Thereby, Signal-to-noise ratio will be descended and error rate will be worsened as a result of the unwanted carrier modulation. Therefore, it is valuable to investigate the phase noise’s detection of oscillator. The existing main detection methods of phase noise are as following, frequency heterodyne method, direct detection method, frequency discriminator method and phase discrim- inator method [7-9]. Frequency heterodyne method for time domain measurement, the other method is generally used for frequency domain measurement. As for the direct detection method and frequency discriminator method, because of its inherent defects, that make phase discriminator method as a relatively better method is widely used in phase noise detection Fig. 1. The measurement principle of phase discriminator method. To be measured’ signal output and reference source’

The measurement principle is shown in Fig. 1. I NTRODUCTION A variety of oscillators are widely used with the rapid development of information technology. Most importantly, the specifications of oscillator are critical in improving the perfor- mance of whole equipments and systems. The specification of phase noise is the most important one among all the parameters of oscillator [1-3]. Phase noise and short term frequency stability are two representations of the same physical phenomenon. Short term frequency stability is a time domain description. Phase noise is a frequency domain

Phase noise is defined as the ratio of the single side-band power at a frequency offset of from the carrier with a measurement bandwidth of 1Hz to the carrier power [5,6]. If an emission excitation signal or a local oscillation signal contained phase noise, noise will likewise appear in receiving end in signal. Thereby, Signal-to-noise ratio will be descended and error rate will be worsened as a result of the unwanted carrier modulation. Therefore, it is valuable to investigate the phase noise’s detection of oscillator. The existing main detection methods of phase noise are as following, frequency heterodyne method, direct detection method, frequency discriminator method and phase discrim- inator method [7-9]. Frequency heterodyne method for time domain measurement, the other method is generally used for frequency domain measurement. As for the direct detection method and frequency discriminator method, because of its inherent defects, that make phase discriminator method as a relatively better method is widely used in phase noise detection Fig. 1. The measurement principle of phase discriminator method. To be measured’ signal output and reference source’

Related

## Time Series Analysis Of The Apollo Project

1540 Words | 7 PagesWhen either the system state dynamics or the observation dynamics is nonlinear, the conditional probability density functions that provide the minimum mean-square estimate are no longer Gaussian. The optimal non-linear filter transmits these non-Gaussian functions and evaluate their mean, which represents a high computational burden. A non-optimal approach to solve the problem, in the frame of linear filters, is the Extended Kalman filter (EKF) or the Unscented Kalman filter (UKF). The EKF or UKF implements a Kalman filter for a system dynamics that results from the linearization of the original nonlinear filter dynamics around the previous state estimates. This research develops an algorithm for the application of the Smooth Transition Autoregressive (STAR) methodology by Terasvirta (1994) to the estimation of the state equation of the Kalman filtering technique.

## Ambient Vibration Lab Report

1349 Words | 6 PagesThe range of vibration amplitudes which can be handled is also large. The recorded data contain all the resonances at locations, thus the analysis and determination of natural modes can be done at the data center. The analogue form of data permits processing in several different ways and gives the analyst greater scope in interpretation. 3.3.1.4 INSTRUMENTATION Ambient vibration testing system is divided into the three parts (ⅰ) Data Acquisition system (ⅱ) Power System and (ⅲ) sensing system. As described, the ambient vibration test above three instrument are necessary for the transcription of vibration, for storage of data and analysis of signal for the dynamic parameters.

## Harmonic Injection Research Paper

969 Words | 4 PagesThe net effect of these 2 factor show the loss in power due to the presence of harmonics. A vital factor which helps in quantifying harmonic injection is Total Harmonic Distortion (THD). It is a measure of the harmonic distortion and is found by normalizing the currents or voltages at all frequencies. Fig. 4.

## Tritrophic Food Chain Model

2005 Words | 9 PagesWe have obtained a stability condition for equilibrium points. We have also given a numerical example and verified our results. One should note that although the equilibrium points are the same for both integer order and fractional order models, the solution of the fractional order model tends to the fixed point over a longer period of time. One also needs to mention that when dealing with real life problems, the order of the system can be determined by using the collected data. The transformation of a classical model into a fractional one makes it very sensitive to the order of differentiation α : a small change in α may result in a big change in the final result.

## Hysteresis Band Pwm Case Study

1419 Words | 6 PagesIn this waveform some harmonics content is present so it is necessary to pass them through a filter. Some varieties of filters are available to improve the output waveform, so following are the normally used filters: 4.7.1 LC Filter: The simplest form of a low pass LC filter is shown in fig.4.3 (1-a) The inductance offers high impedance to harmonic voltage, higher the harmonic number, higher will be the impedance and lower will be the magnitude of the harmonics at the output. fig.4.3 (1-a) Low pass filter The capacitance offers a shunt path for the harmonic current. The higher frequency, the lower will be XC and more harmonics current be by-passed. The filter of fig.

## Torque Ripple Reduction Analysis

2303 Words | 10 PagesHowever, this algorithm requires high computational effort and additional motor parameters to be known. In [6] the duty ratio value is provided by a new fuzzy logic module, whose inputs are the stator flux position, the electromagnetic torque and an input defining the motor operating point, given by the speed and the torque values. This algorithm involves expert knowledge and needs the rotor speed This paper proposes a simple solution for reducing the torque ripple in classical Direct Torque Control, while preserving the good dynamic and structural simplicity of this scheme. The proposed method consists in the modulation of the nonzero voltage vector duration

## Oscillator Case Study

1522 Words | 7 PagesStudy and Design of Current Starved Voltage Controlled Oscillator using Ring Oscillator @ 45nm CMOS Technology Sharad kumar1, Soumendra Kumar Dash2, Sidhant Sahoo3, Bandi Jagdeeshwar Reddy4, Suraj Kumar Saw5, Deepak Prasad6, Vijay Nath7 Department of ECE VLSI Design Group Birla Institute of Technology, Mesra, Ranchi, India Email: prasaddeepak007@gmail.com Abstract-The implementation of CMOS technology in communication field has become the need in present scenario so as to develop such devices which are compact, noise free and dissipate ultra low power. An oscillator is used in order to generate a periodic signal or waveform for various applications. These applications vary from clock generation in microprocessors to carrier synthesis in cellular phones. All these applications require different types of oscillators that can be connected in various topologies. There are many circuit techniques that are used to develop a VCO.

## Antenna Configuration Case Study

1393 Words | 6 PagesCHAPTER 6 RESULTS & DISCUSSION The antenna configuration shown in the last chapter are now being represented in their respective output form. In order to represent it we would be displaying the plots like Return Loss, VSWR plot, Impedance plot, Electric field radiation plot and smith plot. The basic objective behind showing these plots is to justify that the designed antenna will radiate efficiently. 6.1 Results: Antenna Configuration 1: 6.1.1.Return Loss Plot: Return loss is a measure of how well devices or lines are matched. A match is good if the return loss is high.

## Pros And Cons Of IUPQC Control

1460 Words | 6 PagesThe SAF and PAF control loops are independent from each other since they act independently in each active ﬁlter. The dc link voltage control is prepared in the SAF, where

## Vowel Quadrilateral System

1121 Words | 5 PagesThe resultant image of the waveform after its spectral analysis is called a spectrogram. Spectrogram figure

### Time Series Analysis Of The Apollo Project

1540 Words | 7 Pages### Ambient Vibration Lab Report

1349 Words | 6 Pages### Harmonic Injection Research Paper

969 Words | 4 Pages### Tritrophic Food Chain Model

2005 Words | 9 Pages### Hysteresis Band Pwm Case Study

1419 Words | 6 Pages### Torque Ripple Reduction Analysis

2303 Words | 10 Pages### Oscillator Case Study

1522 Words | 7 Pages### Antenna Configuration Case Study

1393 Words | 6 Pages### Pros And Cons Of IUPQC Control

1460 Words | 6 Pages### Vowel Quadrilateral System

1121 Words | 5 Pages