SC5305A Operating & Programming Manual
Rev 2.1.0
24
Table 6. An example of gain-temperature coefficients data and format.
Frequency
(MHz)
50.0
250
500
1000
1500
2500
2800
3800
-0.04500
-0.04800
-0.05600
-0.05000
-0.04500
-0.04800
-0.05600
-0.05000
-0.00038
-0.00035
-0.00029
-0.00038
-0.00038
-0.00035
-0.00029
-0.00038
IF3_FILTER0 Response Calibration
(0x204).
This is a 3x51 float matrix, and data is read back row by row.
This set of data measures pass-band amplitude variation with respect to the center IF, and phase
deviation from linear phase of filter IF3_FILTER0. There are a total of 51 offset frequency points from the
center IF frequency measured inside the bandwidth of the filter. Table 7 is an example of the data and
format.
IF3_FILTER1 Response Calibration
(0x46C).
This is a 3x51 float matrix, and data is read back row by row.
This set of data measures pass-band amplitude variation with respect to the center IF, and phase
deviation from linear phase of filter IF3_FILTER1. There are a total of 51 offset frequency points from the
center IF frequency measured inside the bandwidth of the filter. Table 7 is an example of the data and
format.
Table 7. Relative IF gain and phase response calibration and format.
Frequency Offset (MHz)
-12
-11.5
. . .
-5
. . .
-.5
0
.5
. . .
5
. . .
11.5
12
Gain Error
-58.2
-20.6
. . .
0.9
. . .
0.2
0.0
0.3
. . .
-0.2
. . .
-12.8
-30.4
Phase Error(radians)
.286
.138
. . .
.053
. . .
.012
0
.011
. . .
. . .
. . .
-.129
-.134
IF Invert Gain Correction
(0x788).
This is a float that contains the change in IF gain when the device is
switched to invert the IF spectrum. The default gain in the IF is the non-inverted mode gain.
IF3_Filter1 Gain Correction
(0x790).
This is a float that contains the change in IF gain when the device is
switched to the IF3_FILTER1 path. The default gain in the IF is the IF3_FILTER0 path gain.
IF Attenuator Calibration
(0x798).
This is a 3x30 float matrix, containing the calibrated attenuation
values of the three IF attenuators. Data is read in row by row. Each attenuator has 30 attenuation steps,
and each row correspond to one attenuator. The first row is the attenuation values of IF3_ATTEN2, the
second row contains the values or IF3_ATTEN1, and the third row contains the values of IF1_ATTEN.
Table 8 is an example of the data and its format. Since the IF bandwidth is typically less than 40 MHz
wide and centered at a fixed frequency, it is sufficient to perform the calibration at the center IF as
attenuation variation is insignificant over its range.
Table 8. An example of IF attenuation calibration.
IF3_Attenuator 2
0.973
1.927
2.948
3.912
.
.
.
.
28.630
29.634
IF3_Attenuator1
0.989
1.970
2.998
3.989
28.890
29.874
IF1_ Attenuator
0.995
2.028
3.038
4.023
.
.
.
.
28.868
29.854
