| 摘要 |
A frequency tuning method for a voltage controlled oscillator includes outputting a first frequency selected from 2<SUP>n </SUP>discrete frequencies included in a frequency tuning range of the voltage controlled oscillator based on a predetermined control voltage and an n-bit control code during coarse tuning; outputting a third frequency corresponding to an average of the first frequency and a second frequency, that is, ½ of a code interval in response to the predetermined control voltage, the n-bit control code, and a control bit; and locking an output frequency of the voltage controlled oscillator to a reference frequency based on an analog control voltage and the third frequency during fine tuning. The second frequency is adjacent to the first frequency amoung the 2<SUP>n </SUP>discrete frequencies and the third frequency is used as an initial frequency in the fine tuning.
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