作者: Robert E. Stengel , Lawrence M. Ecklund
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摘要: A frequency generation unit is provided that permits a receiver to tune from channel without cycle skipping and in which compensation for phase offset introduced during tuning provided. The includes fractional-N synthesizer, voltage controlled oscillator (VCO), direct digital synthesizer (DDS). generates frequencies the VCO as well temperature crystal oscillator. Outputs are supplied both DDS control DDS. combination of perpetually locked. maintained locked condition. output An or forms signal unit.