| 摘要 |
PURPOSE:To simplify the constitution of a low-pass filter(LPF) by making plural output circuits selectively selectable and connectable with the one common LPF through connection in corresponding to the output node of each output circuit. CONSTITUTION:Output control circuits 11-13 are inserted between a phase comparator circuit 10 and output stage 11. The plural output circuits 121-123 of the output stage 11 are provided in corresponding to the output control circuits 11-13 and selection control signals C1-C3 are respectively inputted to the output circuits 121-123. Therefore, the plural output circuits 121-123 can be used selectively and the output nodes 131-133 of the output circuits 121-123 can be connected to one common LPF 2 respectively through R1-R3 and, as a result, the constitution of the LPF 2 is simplified. |
