电压控制振荡电路设计与仿真外文翻译

1、.毕业设计（论文）外文翻译 （20092013年）中文题目:电压控制振荡电路设计与仿真英文题目：Design and Simulation of voltage controlled oscillator circuit学 院：共青学院系 别：信息工程系专业班级：09电信本学生姓名：聂志辉学 号：8110109023指导教师：刘定军日 期：2013-5-10 摘要: 振荡器广泛应用于各行各业中，例如在无线电测量仪器中，它产生各种频段的正弦信号电压:在热加工、热处理、超声波加工和某些医疗设备中，它产生大功率的高频电能对负载加热；某些电气设备用振荡器做成的无触点开关进行控制；电子钟和电子手表中采用

2、频率稳定度很高的振荡电路作为定时部件等。在通信系统电路中，压控振荡器(VCO)是其关键部件，特别是在锁相环电路、时钟恢复电路和频率综合器电路等电路中更是重中之重，可以毫不夸张地说在电子通信技术领域，VCO压控振荡器几乎与电流源电路和运放电路具有同等重要的地位。压控振荡器（VCO）的类型有LC压控振荡器、RC压控振荡器和晶体压控振荡器。对压控振荡器的技术要求主要有：频率稳定度好，控制灵敏度高，调频范围宽，频偏与控制电压成线性关系并宜于集成等。晶体压控振荡器的频率稳定度高，但调频范围窄；RC压控振荡器的频率稳定度低而调频范围宽，LC压控振荡器居二者之间。电压控制LC振荡器在任何一种LC振荡器电路中

3、都是将压控可变电抗元件插入振荡回路中，本设计中采用变容二极管作为压控可变点抗元件，这样就可形成LC压控振荡器。早期的压控可变电抗元件是电抗管，后来大都使用了变容二极管。在微波频段，用反射极电压控制频率的反射速调管振荡器和用阳极电压控制频率的磁控管振荡器等也都属于压控振荡器的性质。在通信技术、测量技术、计算机技术等各种领域中，常常要用到精度比较高，频率稳定度高且方便可调的信号源，电压控制振荡器是如今使用非常广泛的一类电子器件，为电光转换电路、移动式手持设备等提供了很好的解决方案。关键字：VCO压控振荡器、LC压控振荡器、RC压控振荡器、晶体压控振荡器1、 压控振荡器在各种振荡电路中，LC振荡电路

4、是比较常见的一种。常用的LC振荡器有以下几种：一：采用互感耦合振荡器形式。调基电路振荡频率在较宽的范围改变时，振幅比较稳定。调发电路只能解决起始振荡条件和振荡频率的问题，不能决定振幅的大小。调集电路在高频输出方面比其他两种电路稳定，幅度较大谐波成分比较小。互感耦合振荡器在调整反馈（改变耦合系数）时，基本上不影响振荡频率。但由于分布电容存在，在频率较高时，难于做出稳定性高的变压器，而且灵活性较差。一般应用于中、短波波段。 二：采用电感三点式振荡。由于两个电感之间有互感存在，所以很容易起振。另外，改变谐振回路的电容，可方便地调节振荡频率，由于反馈信号取自电感两端压降，而电感对高次谐波呈现高阻抗，故

5、不能抑制高次谐波的反馈，因此振荡器输出信号中的高次谐波成分较大，信号波形较差。三：采用电容三点式振荡器。电容三点式振荡电路的基极和发射极之间接有电容，反馈信号取自电容两端，它对谐波的阻抗很小，谐波电压小，因而使集电极电路电流中的谐波分量和回路的谐波电压都较小。反馈信号取自电容两端，由于电容对高次谐波呈现较小的容抗，因而反馈信号中高次谐波分量小，故振荡输出波形好，而且电容三点式振荡器的频率稳定，适于较高工作频率。四：集成电路振荡器。采用压控振荡器芯片MC1648和变容二极管MV209，外接一个LC振荡回路构成变容二极管压控振荡器。只需要调节变容二极管两端的电压，即可改变MC1648的输出频率。由

6、于采用了集成芯片，电路设计简单，系统可靠性高，并且利用锁相环频率合成技术可以使输出频率稳定度进一步提高。2、 RC压控振荡器RC压控振荡器的频率稳定度低而调频范围宽，RC压控振荡器 在单片集成电路中常用RC压控多谐振荡器3、 晶体压控振荡器在用石英晶体稳频的振荡器中，把变容二极管和石英晶体相串接，就可形成晶体压控振荡器。为了扩大调频范围，石英晶体可用AT切割和取用其基频率的石英晶体，在电路上还可采用展宽调频范围的变换网络。在微波频段，用反射极电压控制频率的反射速调管振荡器和用阳极电压控制频率的磁控管振荡器等也都属于压控振荡器的性质。压控振荡器的应用范围很广。集成化是重要的发展方向。石英晶体压控

7、振荡器中频率稳定度和调频范围之间的矛盾也有待于解决。随着深空通信的发展，将需要内部噪声电平极低的压控振荡器。Abstract: oscillator is widely applied in all walks of life, such as in radio measuring instruments, it produces a variety of frequencies of sine signal voltage: during hot working, heat treatment, ultrasonic processing, and some medical devices,

8、 it produces high frequency electric energy of power on heating load; Some electrical equipment made of contactless switch to control the oscillator; Electronic clock and electronic watches using high frequency stability of the oscillating circuit as timing components, etc. In communication system c

9、ircuit, voltage controlled oscillator (VCO) is the key components, especially in the phase-locked loop circuit, clock recovery circuit and frequency synthesis apparatus such as circuit is Paramount, it is no exaggeration to say in the field of electronic communications technology, VCO voltage contro

10、lled oscillator and op-amp circuit with current source circuit almost equally important position.Voltage-controlled oscillator (VCO) type of LC VCO, RC voltage-controlled voltage controlled oscillator and crystal oscillator. Technical requirements of the voltage-controlled oscillator are: good frequ

11、ency stability, control of high sensitivity, wide range of frequency modulation, voltage deviation and control into linear relations conducive to integration, etc. Voltage controlled crystal oscillator frequency stability is high, but the frequency range is narrow; RC voltage-controlled oscillator&#

12、39;s frequency stability is low and wide range of frequency modulation, in between the two LC voltage-controlled oscillator.Voltage control in any LC oscillator in a LC oscillator circuit are the voltage controlled variable reactance inserted element in the oscillation circuit, this design USES the

13、varactor diode as a voltage controlled variable point of component, so that it can form LC voltage-controlled oscillator. Early voltage-controlled element variable reactance is the reactance tube, then mostly use the varactor. At microwave frequencies, with reflector voltage control reflex klystron

14、oscillator frequency with the anode voltage control frequency magnetron oscillator and so on also belong to the nature of the voltage-controlled oscillator.In communication technology, measurement technology, computer technology and other areas, often have to use precision is high, high frequency st

15、ability and convenient adjustable signal source, voltage controlled oscillator is now very widely used class of electronic devices for the electric - light switch circuit, mobile handheld devices, etc. Provides a good solution.Key word: VCO voltage controlled oscillator, LC VCO, RC, voltage controll

16、ed crystal oscillator VCO1、the LC voltage-controlled oscillatorAmong various kinds of oscillation circuit, LC oscillation circuit is one of the more common. Commonly used LC oscillator has the following kinds:1: in the form of mutual inductance coupling oscillator. Adjustable base circuit oscillatio

17、n frequency in a wider scope of changes, the amplitude is stable. Adjustable power road can only solve the problem of starting oscillation condition and the oscillation frequency, can't determine the size of the amplitude. Assemble circuit than the other two in terms of high frequency output cir

18、cuit is stable, the larger harmonic component is small. The mutual inductance coupling oscillator in adjusting feedback (change the coupled coefficient), basically does not affect the frequency of oscillation. But because of the distributed capacitance exist, when the frequency is higher, difficult

19、to make a high stability of the transformer, and poor flexibility. Generally applied in the medium and short wave band.2: the inductance three-point oscillator. Because there is a mutual inductance between two inductors, so it's easy to start up. In addition, the change of resonance loop capacit

20、or, it can conveniently adjust the oscillation frequency, due to the feedback signal from the pressure drop on both ends of the inductance, the inductance of high order harmonic presents high impedance, so can't feedback to restrain high harmonic, so the oscillator output signal of higher harmon

21、ic component is bigger, the signal waveform is poorer.3: the capacitor three-point oscillator. Capacitor three-point oscillator circuit of the base and the emitter of the indirect condenser, the feedback signal from the capacitance at both ends, it is of the harmonic impedance is very small, small h

22、armonic voltage, thus making the collector current harmonic component and harmonic voltage of the circuit in the circuit is smaller. On both ends of the feedback signal from the capacitance, due to the capacitance of higher harmonic present small capacitive reactance, and feedback signal is the high

23、 time harmonic component is small, so the oscillation output waveform is good, and the three-point capacitance oscillator frequency stability, suitable for high working frequency.4: integrated circuit oscillator. Using voltage-controlled oscillator chip MC1648 and varactor MV209, external a LC oscil

24、lation circuit of varactor vco. Only need to adjust the voltage at the ends of the varactor diode, can change the output frequency MC1648. The adoption of integrated chip, simple circuit design, high system reliability, and phase-locked loop frequency synthesis technique can be used to make the outp

25、ut frequency stability is further improved.2、the RC voltage-controlled oscillatorRC voltage-controlled oscillator's frequency stability is low and wide range of frequency modulation, the RC voltage-controlled oscillator in the monolithic integrated circuit is commonly used in RC voltage controlled multivibrator3、voltage controlled crystal oscillatorIn a quartz crystal oscillator frequency stabilization, the varactor diode and concatenated quartz crystal phase, can form a voltage controlled c