发明名称 |
Oscillation circuit including a ring oscillator having a changeable number of inverter circuits |
摘要 |
A digitally controllable oscillator is provided with a variable-frequency ring oscillator comprising an odd number of inverting circuits connected to each other in a ring. The frequency of the output signal of the ring oscillator is determined by a digital input signal specifying the frequency of the output signal of the ring oscillator. The number of times of circulation of a pulse signal through the ring oscillator is counted. A pulse generator generates a pulse signal upon the coincidence of the counted number of times of circulation of the pulse signal through the ring oscillator with a number corresponding to the digital input signal. A series of these operations is repeated to make the pulse generator generate pulse signals successively at a period corresponding to the digital input signal.
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申请公布号 |
US5331294(A) |
申请公布日期 |
1994.07.19 |
申请号 |
US19920956955 |
申请日期 |
1992.10.02 |
申请人 |
NIPPONDENSO CO., LTD. |
发明人 |
WATANABE, TAKAMOTO;OHTSUKA, YOSHINORI;HATTORI, TADASHI |
分类号 |
H03K3/03;H03K3/354;H03L7/099;(IPC1-7):H03B5/00 |
主分类号 |
H03K3/03 |
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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