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RF2460
Rev B6 DS080128
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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 resis-
tor 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
11111
LNA Off
18.77
11101
Mixer Preamp Off
14.28
11100
VCC2 Off
10.05
10100
Mixer Current
7.72
10100
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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