crystal oscillator


A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a precise frequency This frequency is often used to keep track of time

Pierce-gate crystal oscillator , an introduction
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The most common gate oscillator in use today is by far the Pierce-Gate shown in Figure 1. Its popularity stems from the fact that the digital inverter, U1, is usually included in the microprocessor or ASIC the designer selects. In effect, the oscillator cell U1 is free! Most

Manufacturing methods and technology for tactical miniature crystal oscillator
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To date, fifteen engineering samples of TMXO have It is the intent of this paper to describe the been assembled and are presently under evaluation. present Manufacturing Methods and Technology, MMT, program and its impact on TMXO design, manufactura- Mechanical

Quartz crystal oscillator with an effective aging rate compensation
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This paper discusses an application of the modulational method of quartz crystal frequency stabilization to diminution of aging rate in an OCXO within a crystal standard. Description of this last one is given, in which compensation of long-term frequency instabilities is realized

Crystal Oscillator Basics and Crystal Selection for rfPICTM and PICmicro® Devices
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Oscillators are an important component of radio frequency (RF) and digital devices. Today, product design engineers often do not find themselves designing oscillators because the oscillator circuitry is provided on the device. However, the circuitry is not complete. Selection

Basic crystal oscillator design considerations
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In the world of crystal oscillators there are a myriad of design variations, with an even wider spectrum of applications. Experience teaches circuit designers that always considering every factor influencing design complexity and reliability, whether designing an oscillator for

Quartz crystal oscillator at cryogenic temperature
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To improve the problem of both short-term and long-term stability in quartz oscillators, the pas-This paper presents the experimental results sive dual crystal system, in which a voltage conon the properties of quartz crystal resonators at trolled oscillator (VCO) having good

Design of cmos crystal oscillator with low power consumption
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This work proposes a method to reduce the power consumption of Pierce crystal oscillator . This method is base on the mechanism of decreasing the clock signal amplitude. The circuit proposed in paper is designed based on XFAB 0.35 μm CMOS technology to produce a

Design of Low Power CMOS Crystal Oscillator with Tuning Capacitors.
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A low power CMOS crystal oscillator was proposed with high accuracy by tuning capacitors. Based on the analysis concerning power consumption, start-up time, and frequency stability of the crystal oscillator , an amplitude regulation circuit was employed to limit the current

Remote Control System for the Quasi-Zenith Satellite Crystal Oscillator Based On the Two-Way Time Transfer Method
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ABSTRACT The Quasi-Zenith Satellite System (QZSS) is a satellite positioning/ augmentation system to be launched by Japan in 2009. Although the original QZSS scheme includes space-born atomic clocks for the onboard time signal generation, each QZS will be

UART Crystal Oscillator Design Guide
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In order to get the oscillator to start up, it needs initial electrical energy. Power-up transients as well as noise can supply the needed energy. However the energy levels may not be adequately high enough. This can be complemented by large open loop gain at any

A digitally compensated hybrid crystal oscillator
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A thin film hybrid temperature absence of mechanical adjustments and the compensated crystal oscillator has been ability to be electrically reprogrammed developed which utilizes digital com- to synchronize multiple units or to corpensation techniques to maintain a rect

MEASUREMEN. T PHASE NOISE CRYSTAL OSCILLATOR
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One of the most important characteristics of high frequency oscillators (HFO) used in communication devices, navigation equipment, digital devices, systems orientation autopilot aircraft, missile guidance systems, radar equipment is the phase noise generated

Development of Miniaturized Analog and Digital Temperature Compensated Crystal Oscillator
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In todays highly packed RF spectrum, accurate frequency synthesizing in mobile handsets is important to ensure precise allocation of available radio channels. For a synthesizer to achieve its best performance, an accurate and stable reference clock source is a must

A robust oscillator for embedded system without external crystal
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1(a), an external crystal oscillator provides the embedded system with a clock signal for data acquisition . This study integrated a voltage-controlled oscillator (VCO) into the embedded system to reduce component count and cost, as shown in Fig

Low power and EMI, high frequency, crystal oscillator
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The high-frequency oscillator is one of the major causes of both high power consumption and high Electro-Magnetic Interference (EMI) in Embedded Systems (ES). This paper presents a high frequency oscillator circuit that reduces substantially both power

The Effects of Crystal Oscillator Phase Noise on Radar Systems
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Over the last two decades, significant improvements in telecommunications, radar systems, and instrumentation have driven phase noise specifications from near obscurity to prime importance. Quartz crystal reference oscillators are especially crucial since oscillator noise

A 20MHz Low Phase-Noise 0.35 μm CMOS Crystal Oscillator
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The design procedure of a CMOS process integrating Colpitts cr ystal oscillator is described in detail by using the tools of Matlab and advanced design system (ADS). The small-signal analysis is performed both in the viewpoint of negative resistance and positive feedback


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