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參數(shù)資料
| 型號(hào)： | RF2890 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 衰減器 |
| 英文描述： | DUAL-BAND CDMA CELLULAR/GPS LOW NOISE AMPLIFIER/MIXER |
| 中文描述： | 800 MHz - 900 MHz RF/MICROWAVE WIDE BAND LOW POWER AMPLIFIER |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, PLASTIC, QFN-24 |
| 文件頁(yè)數(shù)： | 11/14頁(yè) |
| 文件大?。?/td> | 183K |
| 代理商： | RF2890 |
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8-419
RF2890
Rev A4 040421
IF Output Interface Network
Single-End IF Matching
L1, C1, C2, and R form a current combiner which performs a differential to single-ended conversion at the IF frequency
and sets the output impedance. In most cases, the resonance frequency is independent of R and can be set according to
the following equation:
Where C
EQ
is the equivalent stray capacitance and capacitance looking into pins 9 and 10. An average value to use for
C
EQ
is 2.5pF.
R can then be used to set the output impedance according to the following equation:
where R
OUT
is the desired output impedance and R
P
is the parasitic equivalent parallel resistance of L1.
C
2
should first be set to 0 and C1 should be chosen as high as possible (not greater than 39pF), while maintaining an R
P
of L1 that allows for the desired R
OUT
. If the self-resonant frequencies of the selected C1 produce unsatisfactory linearity
performance, their values may be reduced and compensated for by including C2 capacitor with a value chosen to main-
tain the desired F
IF
frequency.
L2 and C3 serve dual purposes. L2 serves as an output bias choke, and C3 serves as a series DC block.
In addition, L2 and C3 may be chosen to form an impedance matching network if the input impedance of the IF filter is
not equal to R
OUT
. Otherwise, L2 is chosen to be large (suggested 120nH) and C3 is chosen to be large (suggested
22nF) if a DC path to ground is present in the IF filter, or omitted if the filter is DC-blocked.
IF-
IF+
C2
R
L1
L2
V
CC
100 pF
C3
IF Saw
4
5
9
10
IF+
IF-
C1
C1
f
IF
1
2
L
C
1
(
2
C
2
C
EQ
+
+
)
2
π
---------------------------1
=
R
4
R
OUT
--------1
R
P
--1
–
1
–
=
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