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參數資料
| 型號： | LT5526 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Linearity, Low Power Downconverting Mixer |
| 中文描述： | 高線性度，低功耗下變頻混頻器 |
| 文件頁數： | 9/16頁 |
| 文件大?。?/td> | 224K |
| 代理商： | LT5526 |
9
LT5526
5526f
APPLICATIU
The LT5526 consists of a double-balanced mixer, RF
buffer amplifier, high speed limiting LO buffer and
bias/enable circuits. The IC has been optimized for
downconverter applications with RF input signals to 2GHz
and LO signals to 2.5GHz. With proper matching, the IF
output can be tuned for operation at frequencies from
0.1MHz to 1GHz. Operation over a wider input frequency
range is possible, though with reduced performance.
The RF, LO and IF ports are all differential, though the LO
port is internally matched for single-ended drive (with
external DC blocking capacitors). The LT5526 is charac-
terized and production tested using single-ended LO drive.
Low side or high side LO injection can be used.
W
U
U
RF Input Port
Figure 3 shows a simplified schematic of the internal RF
input circuit and example external impedance matching
components for a 900MHz application. Each RF input pin
requires a low resistance DC return to ground capable of
handling 7.5mA. The DC ground can be realized using the
center-tap of an input transformer (T1), as shown, or
through matching inductors or bias chokes connected
from Pins 2 and 3 to ground.
A lowpass impedance matching network is used to trans-
form the differential input impedance at Pins 2 and 3 to the
optimum value for the balun output, as illustrated in
Figures 3 and 4. To assist in matching, Table 1 lists the
differential input impedance and reflection coefficient at
Pins 2 and 3 for several RF frequencies. The following
example demonstrates how to design a lowpass imped-
ance transformation network for the RF input.
From Table 1, the differential input impedance at 900MHz
is: R
RF
+ jX
RF
= 31.3 + j8.41
. The 8.41
reactance is
divided into two halves, with one half on each side of the
31.3
internal load resistor, as shown in Figure 4. The
matching network consists of additional external series
inductance and a capacitor (C1) in parallel with the desired
source impedance (50
in this example). The external
capacitance and inductance are calculated as follows:
n = R
S
/R
RF
= 50/31.3 = 1.597
Q =
√
(n – 1) = 0.773
X
C
= R
S
/Q = 64.7
C1 = 1/(
ω
X
C
) = 2.74pF
X
L
= R
RF
Q = 24.2
X
EXT
= X
L
– X
RF
= 15.8
L
EXT
= X
EXT
/
ω
= 2.79nH
2
TL1
Z
0
= 80
LNG = 1.25mm
TL2
Z
0
= 80
LNG = 1.25mm
T1
1:16
3
4
2
1
RF
+
C1
2.7pF
RF
900MHz
7.5mA
LT5526
7.5mA
5526 F03
3
RF
–
V
BIAS
T1: LDB31900M05C-417
Figure 3. RF Input with External Matching
for 900MHz Application
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LT5526EUF | 制造商:Linear Technology 功能描述:Up/Down Conv Mixer 5V 2GHz 16-Pin QFN EP |
| LT5526EUF#PBF | 功能描述:IC MIXER DOWNCONVERTER LP 16QFN RoHS:是 類別:RF/IF 和 RFID >> RF 混頻器 系列:LT5526 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:100 系列:- RF 型:W-CDMA 頻率:2.11GHz ~ 2.17GHz 混頻器數目:1 增益:17dB 噪音數據:2.2dB 次要屬性:- 電流 - 電源:11.7mA 電源電壓:2.7 V ~ 3.3 V 包裝:托盤 封裝/外殼:12-VFQFN 裸露焊盤 供應商設備封裝:12-QFN-EP（3x3） |
| LT5526EUF#TR | 制造商:Linear Technology 功能描述:Up/Down Conv Mixer 5V 2GHz 16-Pin QFN EP T/R |
| LT5526EUF#TRPBF | 功能描述:IC MIXER DOWNCONV LP 16QFN RoHS:是 類別:RF/IF 和 RFID >> RF 混頻器 系列:LT5526 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:100 系列:- RF 型:W-CDMA 頻率:2.11GHz ~ 2.17GHz 混頻器數目:1 增益:17dB 噪音數據:2.2dB 次要屬性:- 電流 - 電源:11.7mA 電源電壓:2.7 V ~ 3.3 V 包裝:托盤 封裝/外殼:12-VFQFN 裸露焊盤 供應商設備封裝:12-QFN-EP（3x3） |
| LT5526EUFPBF | 制造商:Linear Technology 功能描述:Downconverter Mixer,LT5526 2GHz QFN |
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