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RF2469

W-CDMA AND PCS LOW NOISE AMPLIFIER/MIXER DOWNCONVERTER

RF Micro Devices 

RF2469

Preliminary

Low Current Configuration

External resistors can set different bias currents for LNA1 (pin 3), LNA2 (pin 4, also called the preamplifier of the mixer),

and mixer (pin 17). Customers have the flexibility to choose the most suitable bias current, and therefore the perfor-

mance, of the IC. The charts on the following page reflect different bias currents for the RF2469.

The currents were calculated using the following equations.

LNA1 current (R1)=Total Current (LNA1=EN=1, LNA2=0)-Total Current (EN=1, LNA1=LNA2=0)+1.6

1.6 is the bypass current of LNA1

Mixer/LNA2 current (R2)=Total Current (LNA1=0, LNA2=EN=1)-Total Current (LNA1=LNA2=0, EN=1)+1.4+10.2

1.4 is the bypass current of LNA2; 10.2 is the mixer (LO buffer included)

Mixer Only current (R5)=Total Current (EN=LNA2=1, LNA1=0)-4.5

4.5 is the bypass current of the LNA1 (1.6mA)+LNA2 high mode current (2.9mA)

RFMD chose a low current configuration of the RF2469, by using R1=3kΩ, R2=3.6kΩ, and R5=1kΩ in the evaluation

board, and the following lab results over temperature were obtained.

LNA1 High Mode

Temp

(°C)

Frequency

(MHz)

PIN

(dBm)

VCC

(VDC)

-30

2140

-25

2.78

+25

2140

-25

2.78

8

+85

2140

-25

2.78

Total Current (mA) is when LNA1BYP=LNA2BYP2=EN =1.

Gain

(dB)

+7.97

+8.81

+9.70

IIP3

(dBm)

-3.78

+2.32

+7.71

Noise Figure

(dB)

+1.72

+1.95

+2.37

Total

Current

+11.33

+12.36

+16.45

Mixer/LNA2 BYP High Mode

Temp

(°C)

Frequency

(MHz)

PIN

(dBm)

-30

2140

-25

+25

2140

-25

+85

2140

-25

LO Frequency

(MHz)

2330

2330

2330

PIN LO

(dBm)

-10

-10

-10

VCC

(VDC)

2.78

2.78

2.78

Gain

(dB)

+18.73

+17.74

+16.67

IIP3

(dBm)

-8.16

+5.13

-3.66

Noise Figure

(dB)

+3.98

+4.54

+5.19

8-48

Rev A5 010717

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