| 摘要 |
PURPOSE:To obtain the digital VCO with constitution suitable for LSI- implementation by providing an inversion selector, a decoder for fine adjustment, and an adder instead of a ROM. CONSTITUTION:The inversion selector 10, decoder 21 for fine adjustment and adder 22, are provided as a circuit which functions equivalently to a conventional ROM. The decoder 21 for fine adjustment and adder 22 cooperate with each other to serve as a decoder which decodes a phase difference into a count-up value. The selector 10, decoder 21, and adder 22 are the circuit suitable for the LSI-implementation and a clock generator 40 and a counter 50 are also suitable for the LSI-implementation. Consequently, the digital VCO suitable for the LSI-implementation can be constituted. |
