| Summary: | 碩士 === 逢甲大學 === 電子工程所 === 93 === Abstract
In this thesis we design a 11.492GHz local oscillator circuit. This text was described a circuit which includes several important parts TCXO IC, RF synthesizer IC, Frequency control IC, loop filter, VCO(voltage control oscillator) IC, feedback loop, multiple, micro-strip band-pass filter, amplifier, and micro-strip low-pass filter.
The local oscillator is a very important component in the RF/microwave system. It serves as the signal generator in a transmitter and in a receiver, and the local oscillator is used together with a mixer to convert the received RF signal to an IF signal. The oscillator signal also can serve as a carrier, and the modulating low frequency signal to be transmitted like up-converter or down-converter.
The oscillators used in RF transceivers are usually embedded in a synthesizer environment so as to achieve a precise definition of the output frequency. Nevertheless synthesizer design still remains one of the challenging tasks in RF systems because it must meet very stringent requirement.
The flourish development designing the industry IC in recent years makes us be able to use existing IC directly in the circuit design.
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