【正文】 壓控高頻 LC 振蕩器的設(shè)計 ————————————————————————————— 1 Voltage control design of high frequency LC oscillators Student : Pxxx, physics and information engineering colleges Instructor : xxx, Jianghan University In recent years,with the rapid development of wireless munication technology, make the market for rf integrated circuit has had a huge demand. In the rf circuit, the voltage control oscillation (VCO) occupied a very important a wide range of the early stages of the radio technology development,it is used to produce highfrequency in transmitter carrier voltage,As a specialized superheterodyne receivers in the machine oscillator, be sending and receiving equipment basic the use of oscillator is more and more example: in radio munication, radio, and television equipment used to produce the need of the carrier and the machine oscillation signal。In the electronic measuring instruments used to produce all sorts of frequency sine signals, etc. Definition Oscillator is simply stated a frequency source, usually in a phase lock said is that a device don39。t need the signal to their own motivation, Dc power can be transformed into Ac power .Generally fall into the positive feedback and negative socalled oscillating,Its meaning is to allude to exchange,.Oscillator includes a never oscillation to process and function of pletion from dc to ac power transformation,This device can be called oscillator. Oscillator working principle LC circuit consisting of capacitors and inductors, electric field and the conversion of magic energy production process free oscillation. To maintain the oscillation also has a positive feedback amplifier circuit, the LC oscillator is divided into a transformer coupled and threepoint oscillator, many applications of quartz crystal quartz crystal oscillator, LC oscillator with an integrated operational amplifier. Exactly the same device can not be parameters in the state of the power the moment the two transistor occurs a change, this change due to increasingly strong role in the positive feedback, leading to reach a temporary steady state. During the temporary steady state to another transistor by capacitance gradually 壓控高頻 LC 振蕩器的設(shè)計 ————————————————————————————— 2 charge conduction or closed state of the flip to another temporary steady state. This cycle of formation of oscillation. The classification of oscillator Oscillator are divided into RC, LC oscillators and crystal oscillator,1. The RC oscillator Use the RC work as frequency selective phase shifting work is called RC sinusoidal oscillator Belong to audio oscillator. 2. LC oscillators Use the LC oscillation loop as move and frequency selective work of Positive feedback oscillator is called LC oscillators. LC oscillators classification: (1) transformer coupling Single pipe LC sinusoidal oscillator difference to the LC sinusoidal oscillator (2) Three point pattern Condenser three point pattern oscillator, three point type oscillator (3)The improvement of three type Clapp oscillator, Seiler oscillator (4)The difference of tube oscillator oscillator The oscillation frequency of the oscillator by quartz crystal controlled oscillator. The temperature coefficient oscillator Temperature coefficient oscillator refers to an oscillator, its oscillation frequency and temperature have a specific relationship between the different temperatures corresponding to different oscillation frequencies. Conversely, measuring the output frequency of the oscillator, we can measure the temperature. High temperature coefficient oscillator: its oscillation frequency is affected by temperature, a slight change in temperature, the frequency will change a lot, that is temperature sensitive, and more for the temperature sensor. low temperature coefficient oscillator: the oscillation frequency temperature has little effect, even if the temperature varies greatly, its frequency is essentially the same. Quartz crystal oscillator Quartz crystal oscillator and nontemperature pensated crystal oscillators, temperature pensated crystal oscillator (TCXO), voltage controlled crystal oscillator (VCXO), thermostatically controlled crystal oscillator (OCXO) and digital / μp pensated crystal oscillator (D