Coded data generation or conversion – Analog to or from digital conversion – Nonlinear
Reexamination Certificate
2006-11-07
2006-11-07
Glaude, Jean Bruner (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Nonlinear
C341S144000
Reexamination Certificate
active
07132966
ABSTRACT:
Circuits and methods to convert a digital floating-point number into an analog current have been achieved. The conversion is performed directly by using an exponential current digital-to-analog converter (DAC) and a cascaded linear current digital-to-analog converter (DAC). The exponential current DAC is converting exponentially the exponent of the floating-point number, its output current is biasing the linear DAC, which is converting the mantissa of the floating-point number. The output current of the linear current DAC is correlates linearly with the value of the floating-point number. This technique is commutative, this means the sequence of the linear and the exponential converter can be interchanged. In this case the linear converter provides a biasing current to the exponential converter. The sign bit can be considered by converting the direction of the output current of the converter. This floating-point number conversion can handle a very high dynamic range and requires a minimum of chip space.
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Adler Andreas
Peschke Carlo
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