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參數(shù)資料
| 型號： | RF2460 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | PCS CDMA LOW NOISE AMPLIFIER/MIXER 1500MHZ TO 2200MHZ DOWNCONVERTER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC20 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QFN-20 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大小： | 592K |
| 代理商： | RF2460 |
Preliminary
8-39
RF2460
Rev A7 010912
8
F
Output Interfac e Network of the Mixer
L1, C1, C2, and R form a current combiner which per-
forms 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 7 and 9. 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 (suggested less than 20pF), 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 maintain
the desired F
IF
frequency.
L2 and C3 serve dual purposes. L2 serves as an out-
put 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 cho-
sen 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.
f
IF
1
2
------
C
1
2
C
2
C
EQ
+
+
(
)
2
π
-----------------------------------------------------------
=
R
4
R
OUT
--------------------
R
P
------
–
1
–
=
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| RF2460_06 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:PCS CDMA LOW NOISE AMPLIFIER/MIXER 1500MHz TO 2200MHz DOWNCONVERTER |
| RF2460_1 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:PCS CDMA LOW NOISE AMPLIFIER/MIXER 1500MHz TO 2200MHz DOWNCONVERTER |
| RF2460PCBA-41X | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:PCS CDMA LOW NOISE AMPLIFIER/MIXER 1500MHz TO 2200MHz DOWNCONVERTER |
| RF2461 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:CDMA/FM LOW NOISE AMPLIFIER/MIXER 900MHz DOWNCONVERTER |
| RF2461_06 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:CDMA/FM LOW NOISE AMPLIFIER/MIXER 900MHz DOWNCONVERTER |
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