Switching circuit avoiding glitches at the instant of switch-over between two clock signals
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United States of America Patent
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Aug 8, 1989
Grant Date -
N/A
app pub date -
Jun 12, 1987
filing date -
Jun 24, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A switching circuit is described, for selecting between first and second clock signals. When it is desired to switch from the first to the second clock signal, the first clock signal is de-selected in synchronism with the beat of the first clock and then, after a delay, the second clock signal is selected in synchronism with the beat of the second clock. Conversely, when it is desired to switch from the second to the first clock signal, the second clock signal is de-selected in synchronism with the beat of the second clock and then, after a delay, the first clock signal is selected in synchronism with the beat of the first clock. This avoids the possibility of a short pulse or 'glitch' at the instant of switch-over.
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