发明名称 |
Phase locked loop circuit |
摘要 |
A phase control circuit for controlling the relative phase of periodic components of two logic signals having the same frequency, and one of which periodic components has a pulse-duty factor different from 50:50, said circuit includes a signal source which provides a control signal for regulating the relative phase of the periodic components of said logic signals. The control signal has a first value for phase relationships in a predetermined range of values and a second value for phase relationships outside said range of values. A phase lock detector detects the lock status of the periodic components of the logic signals. Another signal source provides a third logic signal having a periodic component having the same frequency as the periodic component of each of the two logic signals and a pulse width substantially wider than that of the two logic signals. A switch is actuated by the phase lock detector and applies the third logic signal to the signal source when the two logic signals are out-of-lock whereby the control signal has the first value when the two logic signals are phase locked and the second value when the two logic signal are not phase locked.
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申请公布号 |
US5334954(A) |
申请公布日期 |
1994.08.02 |
申请号 |
US19920980946 |
申请日期 |
1992.11.25 |
申请人 |
DEUTSCHE THOMSON-BRANDT GMBH |
发明人 |
KOBLITZ, RUDOLF;LENZ, KUNO |
分类号 |
H03L7/089;H03L7/095;H03L7/107;H03L7/191;H04N5/06;H04N5/12;(IPC1-7):H03L7/107;H04N5/04 |
主分类号 |
H03L7/089 |
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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