发明名称 |
NACHGETRIGGERTER OSZILLATOR FÜR ZITTERFREIE FREQUENZSYNTHESE MIT EINEM PHASENREGELKREIS |
摘要 |
An embodiment of the present invention is a retriggered oscillator timebase including a phase lock loop controlled ring for direct retriggering by a reference oscillator. The ring has taps at various successive stages that are output to an on-the-fly selector that can add any ten-bit value to a current-tap selection to enable a next-tap selection. Such on-the-fly addition can increase the period of a signal each cycle and thereby divide the reference frequency. Ring outputs are also used to drive two other retriggered rings for a plurality of NANO timing generators. The use of two rings allows retriggering of one of the rings before the other has completed a whole one-shot cycle. An on-the-fly selector subtracts a value from a present "NANO" select to a next "NANO" select to convert back the timebase to the fixed reference frequency for phase and frequency comparison. The subtraction acts as a frequency multiplication whose output "t0fx " is equal to the reference frequency. |
申请公布号 |
DE69426975(T2) |
申请公布日期 |
2001.07.19 |
申请号 |
DE1994626975T |
申请日期 |
1994.01.18 |
申请人 |
CREDENCE SYSTEMS CORP., FREMONT |
发明人 |
LESMEISTER, J. |
分类号 |
H03K3/354;G01R31/317;G01R31/319;H03K3/03;H03K5/135;H03K5/15;H03L7/081;H03L7/087;H03L7/099;(IPC1-7):H03K5/26 |
主分类号 |
H03K3/354 |
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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