| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an oscillator circuit highly accurately sweeping a frequency. <P>SOLUTION: In an oscillator circuit 100 with a sweeping function, a first counter 10 counts a reference clock REFCLK a number of times corresponding to a digital first setting signal S1, and generates a first counting completion signal S3 asserted on counting completion. A D/A converter 14 converts a digital second setting signal S2 into an analog control voltage V2. A VCO (Voltage Controlled Oscillator) 20 oscillates at a frequency corresponding to the control voltage V2. The VCO 20 is reset when the first counting completion signal S3 is asserted. An output composition section 30 receives an output signal S5 of the VCO 20 to generate an output signal Sout of the oscillator circuit 100 and to generate the first setting signal S1 and second setting signal S2. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
