Current switch for a high speed DAC
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United States of America Patent
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Oct 31, 1995
Issued Date -
N/A
app pub date -
Jun 15, 1994
filing date -
Jul 12, 1993
priority date (Note) -
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Abstract
A current switch for high-speed and high-resolution digital to analog converters (DACs) employs MOSFET devices to control the current switch output in response to binary input signals at logic level voltages. The current switch reduces ringing of the output current that occurs when switching takes place to improve DAC high speed performance by protecting current steering MOSFET transistors against application of the full swing voltage of the binary input signal by applying lower voltage switching signals in place of the full swing logic level voltages. Furthermore, the current switch compensates for parasitic capacitances within the current steering MOSFET transistor that drives the output current.
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