RF2460PCBA 데이터 시트보기 (PDF) - RF Micro Devices

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RF2460PCBA

PCS CDMA LOW NOISE AMPLIFIER/MIXER 1500MHZ TO 2200MHZ DOWNCONVERTER

RF Micro Devices 

RF2460

Preliminary

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.

ICC Total

LNA Off

Mixer Preamp Off

VCC2 Off

Mixer Current

Current (mA)

25.82

18.77

14.28

10.05

7.72

VCC1

1

1

1

1

1

CONDITION

VCC2

EN

1

1

1

1

1

1

0

1

0

1

LNA Gain

1

0

0

0

0

Mix Gain

1

1

0

0

0

Therefore,

LNA (Bypass) = (Computer Simulation) =

0 mA

LNA (High Gain) =

25.82 - 18.77

=

7.05 mA

Mixer (Preamp) =

18.77 - 14.28

=

4.49 mA

Mixer =

(Measured)

=

7.70 mA

Bias =

10.05 - 7.7

=

2.35 mA

8

LO Circuitry (VCC2) =

14.28 - 10.05

=

4.23 mA

25.82 mA

8-42

Rev A7 010912

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