Table of Contents
Advertisement
7. CALIBRATION
F. RX LNA Gain Switch and AGC Hysteresis Calibration
- Purpose
This procedure calibrates the gain correction parameter of Ak in the AGC algorithm between GLNA=0
and GLNA=1; that is, it establishes the gain difference in the LNA between high gain mode and low
gain mode. It also calibrates AGC_UL and AGC_LL, the upper and lower Ak values where the AGC
should switch between high and low LNA gain (AGC hysteresis).
GVGA (DEC)
72
GLNA=1
6
0
Figure 10-4. LNA Gain Switch and AGC Hysteresis Parameters
1. Set the UE in RX-mode on 10695ch.
2. Feed a CW carrier at 2140 MHz with a power level of -65dBm.
3. Set the AGC_UL and AGC_LL to maximum. GLNA is forced to low gain mode.
4. Get average Ak from Equation 1 and save it. (Ak_LG)
5. Set the AGC_UL and AGC_LL to minimum. GLNA is forced to high gain mode.
6. Get average Ak. (Ak_HG)
7. (Ak_LG) - (Ak_HG) = (Correction).
8. Round off (Correction) to integer (AGC_CR) and store it in GDFS (GD_RF_RX_CONFIG_ID).
AGC_CR is an AGC algorithm parameter and is set to DB 2100 RFIF.
9. Calculate AGC_LL=8+AGC_CR and AGC_UL=18+AGC_CR and store them in GDFS
(GD_RF_RX_CONFIG_ID). AGC_LL and AGC_UL are AGC algorithm parameters and are set to
DB 2100 RFIF.
+ AGC_CR
AGC_CR
GLNA=0
RF Inpu t Lev el (dBm/3.8 4 MHz)
Ak (DEC)
72
AGC_ GMAX
Ak=GVGA+(GLNA*AG C_CR)
AGC_UL
AGC_LL
0
RF Inp ut Level (dB m/3.84 MHz)
- 216 -
AGC_ GMIN
Advertisement
Table of Contents
