发明名称 |
METHOD OF CONTROLLING FREE-RUNNING FREQUENCY OF VOLTAGE-CONTROLLED OSCILLATOR |
摘要 |
A method of easily controlling the free-running frequency of a voltage-controlled oscillator. A single-shot circuit (24) generates a signal of accurate pulse width by using the signal output from a reference oscillator in a frequency synthesizer (20). A frequency counter (28) operates in synchronism with a signal supplied from a VCO (10) within a period corresponding to the pulse width, and a latch circuit (30) holds a count that corresponds to the oscillation frequency of the VCO (10). When this count becomes out of a predetermined range, a CPU (34) varies the control voltage Vs applied to the VCO (10) so that the free-running frequency of the VCO (10) may fall within the predetermined range.
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申请公布号 |
WO0014881(A1) |
申请公布日期 |
2000.03.16 |
申请号 |
WO1999JP04697 |
申请日期 |
1999.08.31 |
申请人 |
T.I.F. CO., LTD.;MIYAGI, HIROSHI |
发明人 |
MIYAGI, HIROSHI |
分类号 |
H03J7/02;H03L7/099;H03L7/113;H04B1/26;H04H40/45;(IPC1-7):H03L7/099;H04H5/00 |
主分类号 |
H03J7/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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