Phase–locked loop (PLL) frequency synthesizers are commonlyfound in communication gear today. The carrier oscillatorin a transmitter and local oscillator (LO) in a receiver arewhere PLL frequency synthesizers are utilized. In some cellularphones, a synthesizer can also be used to generate 90MHz for an offset loop. In addition, synthesizers can be usedin computers and other digital systems to create differentclocks which are synchronized to a master clock.
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