壓控振蕩器(vco)技術(shù)綜述外文翻譯-其他專業(yè)(編輯修改稿)
2025-02-24 08:08 本頁面
【文章內(nèi)容簡(jiǎn)介】 pment of VCO tube. Electronic tube VCO oscillation frequency is changed by the oscillation circuit inductor or capacitor parameter values to adjust. At that time the people to the electronic tube oscillation circuit to carry out a great deal of research, today is still in use in the Hartley, Colpitts, Clapp, Armstrong, Pierce and other classical oscillating circuit structure, was the research results. The middle of the last century, the first transistor and quickly replace the tube bees oscillatory circuit of the active device. In particular the varactor applications on the VCO has important significance to the development of. Variable capacitance diode capacitance as a function of the applied voltage change, using varactor diode voltage controlled device, change the control voltage can be achieved VCO oscillation frequency regulation. In this way, the transistor, varactor diodes and other passive ponents form the vertical transistor VCO. This transistor VCO implementation of the oscillation frequency of the electronic tuning varactor diode, it is the significant contribution of VCO development. Electronic tube with VCO pared to VCO, transistor with electronic tuning, small volume, low cost, small power consumption, good quality, easy FM range setting. Transistor VCO is the development of television technology at that time rapid promotion of important reasons. From 1960 to1980, VCO transistors are widely used in electronic system design. By 1980, the situatio n has changed, hybrid integrated VCO module and monolithic integrated VCO IC appeared. These two kinds of new technology to the development of VC0has produced important influence. VCO has started to enter the modern VCO technology development period. A variety of VCO technology life cycle and the time relation shown in Figure L. The graph, a brief description of the VCO technology in the past 80 years development course. 黃河科技學(xué)院畢業(yè)設(shè)計(jì)（ 文獻(xiàn)翻譯 ） 第 9 頁 Fig 1 VCO technology life cycle Variable capacitance diodes, capacitors, inductors and other ponents of the miniaturization for the manufacture of VCO ponents to create the conditions. VCO ponent is a hybrid integrated circuit device, a package and the outer lead wires. Although discrete transistor VCO according to user requirements with the design and operating frequency tuning range and flexibility, but generally in the production need to consume a large amount of artificial to determine the frequency ponents for debugging, in order to eliminate the element error on the frequency effect. In addition, discrete ponents VCO needs good shielding, its size is relatively large. Discrete element VCO can not satisfy the requirements of the development of modern wireless electronic system. At the end of nieen eighties, the early 9039。s, the rapid development of the mobile phone, with a package of oscillator ponents growing demand. This is a VCO ponent development offerred rare market opportunity. Along with the new wireless application development, each VCO ponent manufacturers developed for different applications in the field of desired frequency products. Due to the small surface mount ponents (1206080506030402 and0201), the new development of the VCO ponent size is more and more small, cost more and more low. Figure 2 illustrates the modern mercial VCO ponent size with reduced variation. At present, the VCO ponent has reached a new level, its volume is reduced to 4mm * 5mm * 2mm, supply large quantities VCO sales price has dropped to about $1. VCO ponent in the15 years of its size reduced sharply, to meet the new wireless mobile devices such as cellular phones on the miniaturization requirement. 黃河科技學(xué)院畢業(yè)設(shè)計(jì)（ 文獻(xiàn)翻譯 ） 第 10 頁
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