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Fusion Family of Mixed Signal FPGAs
Revision 4
2-87
Terminology
BW 鈥� Bandwidth
BW is a range of frequencies that a Channel can handle.
Channel
A channel is define as an analog input configured as one of the Prescaler range shown in Table 2-57 on
page 2-133. The channel includes the Prescaler circuit and the ADC.
Channel Gain
Channel Gain is a measured of the deviation of the actual slope from the ideal slope. The slope is
measured from the 20% and 80% point.
EQ 1
Channel Gain Error
Channel Gain Error is a deviation from the ideal slope of the transfer function. The Prescaler Gain Error
is expressed as the percent difference between the actual and ideal, as shown in EQ 2.
EQ 2
Channel Input Offset Error
Channel Offset error is measured as the input voltage that causes the transition from zero to a count of
one. An Ideal Prescaler will have offset equal to of LSB voltage. Offset error is a positive or negative
when the first transition point is higher or lower than ideal. Offset error is expressed in LSB or input
voltage.
Total Channel Error
Total Channel Error is defined as the total error measured compared to the ideal value. Total Channel
Error is the sum of gain error and offset error combined. Figure 2-68 shows how Total Channel Error is
measured.
Total Channel Error is defined as the difference between the actual ADC output and ideal ADC output. In
the example shown in Figure 2-68, the Total Channel Error would be a negative number.
Figure 2-68 Total Channel Error Example
Gain
Gainactual
Gainideal
-------------------------
=
ErrorGain
(1-Gain) 100%
=
ADC
Output
Code
Ideal
Output
Input Voltage to Prescaler
T otal C hannel Error
C hannel Gain
Actual Output
Channel Input
Offset Error
}
鐩搁棞PDF璩囨枡
PDF鎻忚堪
RGM43DTBT CONN EDGECARD 86POS R/A .156 SLD
M1AFS250-1QNG180 IC FPGA 2MB FLASH 250K 180-QFN
EPF8820AQC160-4 IC FLEX 8000A FPGA 8K 160-PQFP
RSM43DTAT CONN EDGECARD 86POS R/A .156 SLD
M1A3P600-1FGG256 IC FPGA 1KB FLASH 600K 256-FBGA
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