©2018
Rev 1.1
7
Calibration
Table 10. Calibration EEPROM Map
Offset
address
Points
Length
(Bytes)
Data Type
Description
0x00
664
664
U_8
Factory Reserved
0x298
1
4
Float_32
Calibration Temperature
0x29C
6
12
Float_32
Temp coeffs, band1 = <13 GHz, <13Ghz,
band2 < 20GHz, and band3 > 20 GHz. (c1, c2, c1, c2,
c1, c2)
0x338
35
140
Float_32
IF response cal frequencies
100, 200, 300
, …,
3500 in MHz
0x4B0
35
140
Float_32
IF3_response, relative gain to 1 GHz at each IF cal
frequency
0x5C8
30
120
Float_32
Relative IF
atten 1 dB.….30 dB, 1 dB step
0x6B8
60
240
Float_32
Bypass response cal frequencies
100, 200, 300, …,
6000 in MHz
0x7A8
60
240
Float_32
Bypass absolute gain at each bypass cal freq
0x898
83
332
Float_32
RF cal frequencies, 6 GHz to 26.5 GHz, 250 MHz step
0xBD0
83
332
Float_32
RF non-invert abs gain @ each rf cal freq
0xF08
83
332
Float_32
RF invert abs gain @ each rf cal freq
0x1240
83
332
Float_32
Rf rel amplifier gain @ each rf cal freq
0x1578
2490
9960
Float_32
RF atten, 1-30 dB, 1 dB step for each freq
a1_f0, a1_f1,…,a1_fN
a2_f0, a2_f1,…,a2_fN
a30_f0, a30_f1,…,a30_fN
Absolute Conversion Gain
It is difficult to make gain measurements of every configuration setting of the downconverter as there are
many combinations of attenuator and frequency settings, not to mention the various operating
temperatures. However, the gain of the device can be computed to a reasonable level of accuracy with
less data if the assumption is that every component setting is independent from one another. For
example, assume the frequency response of the IF_ATTEN attenuator is the same for all attenuation
settings. Another assumption we made, which may introduce the most error is the IF response is the
same for all LO and RF values. As an example, the IF value at 2 GHz is the same for the sets (LO = 12 GHz,
RF = 10 GHz) and (LO = 16 GHz, RF = 14 GHz).