Analog Dialogue 33 - 3 ( 1999 ) 1 Phase - Locked Loops for High - Frequency Receivers and Transmitters – Part 1
نویسنده
چکیده
PLL Basics A phase-locked loop is a feedback system combining a voltagecontrolled oscillator and a phase comparator so connected that the oscillator frequency (or phase) accurately tracks that of an applied frequencyor phase-modulated signal. Phase-locked loops can be used, for example, to generate stable output frequency signals from a fixed low-frequency signal. The first phase-locked loops were implemented in the early 1930s by a French engineer, de Bellescize. However, they only found broad acceptance in the marketplace when integrated PLLs became available as relatively low-cost components in the mid-1960s.
منابع مشابه
Phase - Locked Loops for High - Frequency Receivers and Transmitters – Part
In this second part, we will focus on a detailed examination of two critical specifications associated with PLLs: phase noise and reference spurs. What causes them and how can they be minimized? The discussion will include measurement techniques and the effect of these errors on system performance. We will also consider output leakage current, with an example showing its significance in openloo...
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