參數(shù)資料
型號(hào)： LT5521EUF
廠商： Linear Integrated Systems
英文描述： Very High Linearity Active Mixer
中文描述： 很高的線性度有源混頻器
文件頁(yè)數(shù)： 10/16頁(yè)
文件大?。?/td> 283K
代理商： LT5521EUF
10
LT5521
5521f
APPLICATIU
The LT5521 is a high linearity double-balanced active
mixer. The chip consists of a double-balanced mixer core,
a high performance LO buffer and associated bias and
enable circuitry. The chip is designed to operate with a
supply voltage ranging from 3.15V to 5.25V.
W
U
U
Table 2. Port Impedance
FREQUENCY
(MHz)
50
100
300
600
1000
1500
2000
2300
3200
3500
4000
DIFFERENTIAL
INPUT
19.8 + j0.7
20.1 + j2.0
18.2 + j5.3
15.2 + j16.8
14.5 + j28.1
20.5 + j42.3
48.2 + j26.8
18.2 + j29.4
22.4 + j125.1
DIFFERENTIAL
OUTPUT
282.2 – j8.4
282.3 – j20.8
262.3 – j55.1
231.4 – j67.0
215.0 – j124.5
109.5 – j158.0
52.9 – j92.1
61.6 – j74.2
14.2 – j27.5
27.9 – j4.4
42.8 – j16.0
SINGLE-ENDED
LO
49.9 + j0.1
49.8 + j0.3
49.2 + j0.9
47.7 + j2.0
45.3 + j2.8
43.3 + j2.8
43.0 + j3.3
43.4 + j4.6
44.6 + j14.0
42.4 + j17.9
38.6 + j22.8
Signal Input Interface
Figure 2 shows the signal inputs of the LT5521. The signal
input pins are connected to the common emitter nodes of
the mixer quad differential pairs. The real part of the
differential IN
+
/IN
–
impedance is 20
. The mixer core
current is set by external resistors R1 and R7. Setting their
values at 110
, the nominal DC voltage at the inputs is
2.2V with V
CC
= 5V. Figure 3 shows the input return loss
for a matched input at 250MHz.
For input frequencies above 100MHz, a broadband im-
pedance matching tranformer with a 1:1 impedance ratio
is recommended. Table 3 provides the component values
necessary to match various IF frequencies using the M/A-
COM CT0010 transformer (T1, Figure 1).
Table 3. Component Values for Input Matching Using the
M/A-COM CT0010
IF
C2
44MHz
1000pF
95MHz
820pF
120MHz
1000pF
150MHz
330pF
170MHz
330pF
250MHz
82pF
300MHz
15pF
435MHz
8.2pF
520MHz
6.8pF
Z14
120nH
33pF
27pF
22pF
18pF
10pF
3.9pF
0.5pF
Unused
Z3
150pF
27nH
18nH
10nH
6.8nH
0
0
0
0
Below 100MHz, the Mini-Circuits TCM2-1T or the Pulse
CX2045 are better choices for a wider input match. This
configuration is shown in Figure 4. The series 1nF capaci-
tors maintain differential symmetry while providing DC
isolation between the inputs. This helps to improve LO
suppression.
Shunt capacitor C13 (Figure 2) is an optional capacitor
across the input pins that significantly improves LO sup-
pression. Although this capacitor is optional, it is impor-
tant to regulate LO suppression, mitigating part-to-part
variation. This capacitor should be optimized depending
Figure 2. Signal Input with External Matching
Figure 3. IF Input Return Loss
V
CC
IN
–
IN
+
R1
Z1
OPT
Z3
C2
LT5521
3
2
C13
IF
IN
50
5521 F02
Z14
C6
1nF
R7
T1
1:1
Z7
OPT
FREQUENCY (MHz)
100
I
–25
–20
–15
250
350
5521 F03
–30
–35
–40
150
200
300
–10
–5
0
400
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