Phase locked loop circuit with digital control
作者： Martin Gerard Gravenstein , Richard Albert Kennedy , Stephen Levere Inman , Seyed Ramezan Zarabadi
DOI:
关键词: Electronic engineering 、 Phase-locked loop 、 Delay-locked loop 、 Pass transistor logic 、 Voltage-controlled oscillator 、 Phase detector 、 Operational amplifier 、 CMOS 、 Logic gate 、 Engineering
摘要: A Phase Locked Loop (PLL) circuit includes a control signal generator, digital phase detector, logic gates, charge pump (charge/discharge circuit), transmission gate, loop filter, lead-lag filter and voltage controlled oscillator (VCO). Outputs of the detector are coupled through gates to inputs pump. An output is capacitor first input/output gate. second gate an input whose VCO detector. source reference frequency signal. The generator generates non-overlapping complementary signals with one same connected other Accordingly, electrical path from closed open or vice versa. operational amplifier AC feedback which by controls gates. PLL typically formed on single integrated silicon chip using CMOS technology.
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