Analog-to-digital converter
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United States of America Patent
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Issued Date -
Apr 6, 2006
app pub date -
Oct 6, 2004
filing date -
Oct 6, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention discloses an analog-to-digital converter, which is mainly applied in a digital acoustic signaling system. Conventional AD converter merely has one Schmitt Trigger. Since the bias point is fixed, the change of trigger voltages due to different semiconductor process parameters will cause output digital signals having asymmetric wave pattern. Hence, the transmission quality may deteriorate. The present invention determines the bias point by providing an additional Schmitt trigger. The value of the determined bias would shift with the change of trigger voltages, so the relative variation between them would be eliminated. Therefore, the input analog signals would be correctly converted to the output digital signals.
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