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Preliminary
8-42
RF2460
Rev A7 010912
8
Current Measurement
To measure only the current of the different circuitry in the evaluation board, use the following procedure.
First, replace the bias choke inductor at the output of the mixer (L3 for US-PCS) with a 1
Ω resistor. The voltage across
the resistor will represent the mixer current. Terminate all SMA connections at 50
Ω.
Second, follow the table below.
Therefore,
CONDITION
Current (mA)
VCC1
VCC2
EN
LNA Gain
Mix Gain
ICC Total
25.82
1
11
11
LNA Off
18.77
1
11
01
Mixer Preamp Off
14.28
1
11
00
VCC2 Off
10.05
1
01
00
Mixer Current
7.72
10
10
0
LNA (Bypass) = (Computer Simulation) =
0mA
LNA (High Gain) =
25.82-18.77
=
7.05mA
Mixer (Preamp) =
18.77-14.28
=
4.49mA
Mixer =
(Measured)
=
7.70mA
Bias =
10.05- 7.7
=
2.35mA
LO Circuitry (VCC2) =
14.28-10.05
=
4.23mA
25.82mA
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