Lime Microsystems LMS7002M Series, Руководство по программированию и калибровке

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30
Address (15 bits) Bits Description
0x0110 15
14 – 10
9 – 5
4 – 0
Reserved
ICT_LNACMO_RFE_(1, 2)[4:0]: Controls the current generating LNA output
common mode voltage.
Default: 2
ICT_LNA_RFE_(1, 2)[4:0]: Controls the current of the LNA core. Default: 12
Block current = Nominal current * (ICT / 12)
ICT_LODC_RFE_(1, 2)[4:0]: Controls the DC of the mixer LO signal at the gate of
the mixer switches.
Default: 20
Vgate=Vth+3.5Kohm*20uA*(ICT/12)
If Vgate is too high, the voltage saturates and further increasing this ICT
will not increase Vgate. Possible over voltage on mixer gates.
Default : 00001001 10010100
0x0111 15 – 10
9 – 5
4 – 0 Reserved
CAP_RXMXO_RFE_(1, 2)[4:0]: Control the decoupling cap at the output of the RX
Mixer.
Default: 4
SE cap = (CAP_RXM1) * 80fF
CGSIN_LNA_RFE_(1, 2)[4:0]: Controls the cap parallel with the LNA input NMOS
CGS to control the Q of the matching circuit and provides trade off between gain/NF
and IIP. The higher the frequency, the lower CGSIN_LNA_RFE should be. Also, the
higher CGSIN, the lower the Q, The lower the gain, the higher the NF, and the
higher the IIP3
0 – for 3500MHz
1 – for 2600MHz
3 – for 1900MHz (default)
6 – for 800MHz
Default : 00000000 10000011
0x0112 15 – 12
11 – 0
CCOMP_TIA_RFE_(1, 2)[3:0]: Compensation capacitor for TIA. This is a function of
CFB_TIA_RFE
3 – for CFB 220
11 – for CFB 500
12 – for CFB>1000 (default)
CFB_TIA_RFE_(1, 2)[11:0]: Feedback capacitor for TIA. Controls the 3dB BW of the
TIA. Should be set with calibration through digital base band.
Default: 230
Nominal values:
232 – for F3dB 9.15M
468 – for F3dB 4.59M
Default
: 11000000 11100110