44 (55) BRUKER BIOSPIN Technical Manual Version 001
Description
Functionality of Devices 5.5
Digital Preemphasis
Digital pre-emphasis means that the digital gradient values given out by the GCU
for certain time intervals change the gradient amplifier transfer. The deviating val
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ues are determined according to a predefined function and are likewise conveyed
to the gradient amplifier.
Digital pre-emphasis is only meaningful when the gradient amplifier evaluates the
conveyed values in a fixed, equidistant time period and a valid read has already
been received by the DPP for each of these times.
In this case the GCU generates as before the gradient values and the
NEXT_GRADIENT signal. When these values are output they must be adapted to
the adjusted gradient raster, which determines the exact time of switching the gra
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dients and the basic values.
Adapted means that the NEXT_GRADIENT can be flanked at any time between
two NEXT_VALUE, whereby the flank following determines the time of the effec
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tiveness of the gradient packets under summation of a constant pipeline distance.
The minimum gradient raster agreed upon is 1 µsec.
Figure 5.5: Block Diagram
DPP Pipeline 5.5.1
Detailed Procedure
The „NEXT Gradient“ appears before the „NEXT VALUE“. The included gradient
packet is transferred directly before or after it, so that the „Next Value“ after next is
available at the FIFO output.
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