be fulfilled in order to obtain oscillation in the closed loop circuit.
LC oscillators use capacitors and inductors to construct the frequency selective filter in the Fig. LC OSCILLATORS LC oscillators are commonly used in radio-frequency circuits because of their good phase noise characteristics and their ease of implementation. After the simulations and analysis, it goes to a conclusion. There is also another kind feedback oscillator using quartz crystal given in section IV.
To get a more stable output frequency, two improved capacitor feedback oscillators are given and simulated in section III. In section II, the basic concepts of LC oscillators are introduced with some examples.
And knowing basic oscillator circuits well enables one to design oscillator circuit according to the situation and the requirements. By studying and analyzing these oscillators with Multisim, one can obtain a deeper understand of feedback oscillators with different type of frequency selective filter using in the feedback loop. The LC oscillator circuits and the crystal oscillator circuits covered in this paper all belong to feedback oscillators. Harmonic oscillators can be further divided into two types: feedback oscillators and negative resistance oscillators. The former produces a sinusoidal output while the latter produces a non-sinusoidal output, such as a square, sawtooth or triangle wave. There are two main types of oscillators: the linear or harmonic oscillator and the nonlinear or relaxation oscillator. Issues of spectral purity and amplitude stability must be addressed, which leads to different designs of oscillator circuits. However, simply generating some periodic output is not sufficient for modern high-performance RF receivers and transmitters. While we studying for basic electronics classes, oscillator circuits are not unfamiliar and play an important role.
INTRODUCTION Oscillators are a class of circuits with one terminal or port, which produce a periodic electrical output upon power up. The general idea of oscillation by feedback is illustrated in Fig. By doing simulations in Multisim 2, the oscillation frequencies are checked and the properties of different oscillators are compared. & Electrical Engineering Shanghai Jiao Tong University Shanghai, China Abstract Several classic RF oscillators are analyzed in this paper, including LC oscillators and quartz crystal oscillators. 1 RF Oscillator Simulation and Analysis In Multisim 2 Tang Weijie School of Electronic, Info.
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