PLL circuit of pulse swallow-type prescaler system
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United States of America Patent
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Jun 17, 1997
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Mar 18, 1993
priority date (Note) -
Expired
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Abstract
A PLL circuit of the pulse swallow-type prescaler system prevents erroneous module count operations such as are caused by a delay in the module signal, without the need to use a device which operates at high speeds or a device of large power. In a synthesizer of the pulse swallow-type prescaler system, a PLL circuit has a PLL COUNTER circuit and a module pulse generating circuit and a prescaler circuit has a prescaler counter, an extender circuit and a module control circuit which outputs a module control signal MO, for controlling the module operation, upon sensing the logic state of the module pulse generating signal MK, which is output by the module pulse signal generating circuit in response to the output signal MD of the PLL counter circuit.
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