【正文】 （ 文獻(xiàn)翻譯 ） 第 13 頁(yè) transceiver frontend IC integrated together, so that its size is greatly reduced. WLAN ( type and 5GHZ type ) called VCO has very low phase noise. Because RF IC VCO technology unceasing development, satellite receiver, CATV settop box, wireless data device, cordless phones, mobile phones and other mercial RF systems and devices are increasingly used integrated frequency source. Obviously, in largescale mercial application, monolithic integrated VCO market share will continue to increase, and the discrete ponent VCO and VCO ponents of market share will be reduced stage by stage. Monolithic integrated VCO in largescale mercial wireless system is dominated by the time will soon e. VCO technology has realized from the heavy electric tube VCO circuit to the area less than 1square mm Si IC span. VCO is the key device of frequency source, has been widely used in various electronic systems. The performance of VCO has a decisive effect on electronic system. In modern mobile munication system to promote the development of VCO high frequency, to form a new generation of microwave VCO. The VCO ponents and VCO microwave monolithic integrated VCO is a main structural form, is currently the mainstream product of wireless system. Although, in the overall performance levels, monolithic integrated VCO is inferior to VCO ponent, but it has the integrated advantage, VCO still is the developing direction in the future [5]. In the RF IC technology, SiGe BiCMOS technology is a monolithic integrated VCO the most promising manufacturing technology. From: ISO/IEC JTC1/SC29/WG1 (ITUSG8) N2058, JPEG2021 is now an International Standard, 9 March 2021. 。 electronic clock and electronic watches using frequency stability high oscillation circuit as a timing ponent. Especially in the munication system circuit, a voltage controlled oscillator ( VCO ) is one of the key parts, especially in the phaselocked loop circuit, clock recovery circuit and frequency synthesizer circuit is Chongzhongzhi is heavy, it is no exaggeration to say in electronic munication technology, VCO almost with the current source and the operational amplifier has the same important position. 黃河科技學(xué)院畢業(yè)設(shè)計(jì)（ 文獻(xiàn)翻譯 ） 第 8 頁(yè) development of process At the beginning of the last century, Armstrong invented electronic oscillator, the improved Hartley circuit design and the successful development 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 develop