Phase-locked loop circuit
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShiro Dosho, Takashi Morie, Kouji Okamoto, Yuji Yamada, Kazuaki Sogawa
Life of this patent
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Abstract
The phase-locked loop circuit includes a gain setting circuit for setting a gain of a voltage controlled oscillator, and a time-constant setting circuit for setting a time constant, which is determined by the amount of current in a charge pump circuit and a capacitance value of a loop filter. The gain setting circuit sets the gain to a predetermined value, and the time-constant setting circuit sets the time constant to a predetermined value, whereby the loop band width of the phase-locked loop circuit is set to a desired value.
Claims6
A phase-locked loop circuit comprising:
- a gain setting circuit for setting a gain of a voltage controlled oscillator;
- and
- a time-constant setting circuit for setting a time constant, which is determined by the amount of current in a charge pump circuit and a capacitance value of a loop filter.
Dependencies are inferred from the claim text.