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參數(shù)資料
| 型號： | RF2469 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | W-CDMA AND PCS LOW NOISE AMPLIFIER/MIXER DOWNCONVERTER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC20 |
| 封裝： | 4 X 4 MM, LCC-20 |
| 文件頁數(shù)： | 16/18頁 |
| 文件大小： | 255K |
| 代理商： | RF2469 |
Preliminary
8-48
RF2469
Rev A5 010717
8
F
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=3k
, R2=3.6k
, and R5=1k
in the evaluation
board, and the following lab results over temperature were obtained.
LNA1 High Mode
Temp
(°C)
-30
+25
+85
Total Current (mA) is when LNA1BYP=LNA2BYP2=EN=1.
Frequency
(MHz)
2140
2140
2140
P
IN
(dBm)
-25
-25
-25
V
CC
(V
DC
)
2.78
2.78
2.78
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)
-30
+25
+85
Frequency
(MHz)
2140
2140
2140
P
IN
(dBm)
-25
-25
-25
LO Frequency
(MHz)
2330
2330
2330
P
IN
LO
(dBm)
-10
-10
-10
V
CC
(V
DC
)
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
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