A novel PLL concept, SPILL, suitable for intermittent-operation frequency synthesizers used i n UHF portable radio sets is proposed. The SPILL employs digital circuit techniques which preserve frequency and phase during power-off periods, i n order t o perform fast acquisition at the beginning of power-on period. Both theoretical analysis and experiments confirm acceptable acquisition performance. A 1.6 GHz SPILL frequency synthesizer achieves t w o order magnitude improvement o n acquisition time. Application of the SPILL t o high frequency synthesizer are especially effective f o r reducing p o w e r consumption in the portable radio communication set.
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