| 摘要 |
The invention is an enhancement for fractional-N based RF frequency synthesis to allow phase locked loops to switch output frequency more rapidly. An integrated fractional-N controller automatically sweeps from its current frequency to a new frequency when a new frequency is requested. Upon initialization, the fractional-N controller receives a value representing the desired sweep rate. This value is stored and used for all subsequent frequency changes. The automatic swept frequency feature accommodates new frequencies greater or less than the current frequency.
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