Oscillators – Ring oscillators
Patent
1997-02-13
1999-07-27
Kinkead, Arnold
Oscillators
Ring oscillators
331 1A, 331 74, 327156, 327159, 327161, H03K 3017, H03K 504
Patent
active
059297140
ABSTRACT:
A phase lock loop timing generator including a voltage controlled oscillator as a current-limited ring oscillator composed of multistage inverters connected in series in a ring form using a phase lock loop. From nodes of the inverters, .phi.0 to .phi.8 signals are obtained and an AND or OR of the signals are calculated to generate an internal timing. The obtained timing pulse is defined by % of a clock cycle of a reference clock signal and thus a timing depending on an external cycle can be set. Further, a timing prior to the clock edge of the reference clock signal can be generated and by using this timing, an effective current cut of an input buffer can be performed. Hence, a timing generation proportional to the external clock cycle without being affected by a production process or the like to enable us to provide a flexible timing designing.
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Kinkead Arnold
NEC Corporation
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