Apparatus for enabling duty cycle locking at the rising/falling edge of the clock
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United States of America Patent
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Sep 9, 2008
Grant Date -
Nov 9, 2006
app pub date -
Apr 28, 2006
filing date -
Apr 29, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for enabling duty cycle locking at the rising/falling edge of the clock includes a counter that receives a gated input clock. A lock detector receives an input clock for generating control signals. An address decoder is connected to the counter for generating a set of selection signals. A first multiplexer includes select lines connected to receive the selection signals. A plurality of delay chains provide multiple output taps with a first delay chain connected to the first multiplexer. A second multiplexer is connected to one of the plurality of delay chains with its select lines being hard wired. A latch is connected to the output of the first multiplexer and the second multiplexer for providing the output.
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