RF2460
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 1Ω resistor. The voltage across
the resistor will represent the mixer current. Terminate all SMA connections at 50Ω.
Second, follow the table below.
CONDITION
Current (mA)
V
V
EN
LNA Gain
Mix Gain
CC1
CC2
I
Total
25.82
1
1
1
1
1
CC
LNA Off
Mixer Preamp Off
18.77
14.28
10.05
1
1
1
1
1
0
1
1
1
0
0
0
1
0
0
V
Off
CC2
Mixer Current
7.72
1
0
1
0
0
Therefore,
LNA (Bypass) = (Computer Simulation)
=
=
=
=
=
=
0mA
LNA (High Gain) =
Mixer (Preamp) =
Mixer =
25.82-18.77
18.77-14.28
(Measured)
10.05-7.7
7.05mA
4.49mA
7.70mA
2.35mA
4.23mA
Bias =
LO Circuitry (V
) =
14.28-10.05
CC2
25.82mA
8-92
Rev B5 060921
RFMD [ RF MICRO DEVICES ]
