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锁相环的一些常见问题,比较不错

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频合常见问题答疑Ask the Applications Engineer―30
by Adrian Fox [adrian.fox@analog.com]
PLL SYNTHESIZERS
Q. What is a PLL Synthesizer? A. A frequency synthesizer allows the designer to generate a variety of output frequencies as multiples of a single reference frequency. The main application is in generating local oscillator (LO) signals for the up- and down-conversion of RF signals. The synthesizer works in a phase-locked loop (PLL), where a phase/frequency detector (PFD) compares a fed back frequency with a divided-down version of the reference frequency (Figure 1). The PFD’s output current pulses are filtered and integrated to generate a voltage. This voltage drives an external voltage-controlled oscillator (VCO) to increase or decrease the output frequency so as to drive the PFD’s average output toward……
标签:频合常见问题答疑
锁相环的一些常见问题,比较不错
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