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SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015
Table 5-40. FRONTEND Register (16h)
DEFAULT
REGISTER
NAME
ACTIVE
DESCRIPTION
VALUE
FRONTEND[7:6]
LNAMIX_CURRENT[1:0]
2
—
Controls current in LNA, LNA2 and mixer
Recommended setting: LNAMIX_CURRENT=1
FRONTEND[5:4]
LNA_CURRENT[1:0]
1
—
Controls current in the LNA
Recommended setting: LNA_CURRENT=3.
Can be lowered to save power at the expense of reduced
sensitivity.
FRONTEND[3]
MIX_CURRENT
0
—
Controls current in the mixer
Recommended setting:
MIX_CURRENT=1 at 426 to 464 MHz,
MIX_CURRENT=0 at 852 to 928 MHz.
FRONTEND[2]
LNA2_CURRENT
0
—
Controls current in LNA 2
Recommended settings:
LNA2_CURRENT=0 at 426 to 464 MHz,
LNA2_CURRENT=1 at 852 to 928 MHz.
FRONTEND[1]
SDC_CURRENT
0
—
Controls current in the single-to-diff. Converter
Recommended settings:
SDC_CURRENT=0 at 426 to 464 MHz,
SDC_CURRENT=1 at 852 to 928 MHz.
FRONTEND[0]
LNAMIX_BIAS
1
—
Controls how front-end bias currents are generated
0: Constant current biasing
1: Constant Gm × R biasing (reduces gain variation)
Recommended setting: LNAMIX_BIAS=0.
74
Detailed Description
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