參數(shù)資料
型號(hào)： LT5525
廠商： Linear Technology Corporation
英文描述： 400MHz to 3.7GHz High Signal Level Downconverting Mixer
中文描述： 400MHz至3.7GHz高信號(hào)電平下變頻混頻器
文件頁(yè)數(shù)： 13/16頁(yè)
文件大?。?/td> 221K
代理商： LT5525
13
LT5527
5527f
APPLICATIU
W
U
U
L1 2
,
R
R
C6 7
,
R
R
L
X
IF
OUT
IF
IF
IF
OUT
IF
IF
1
3
=
=
=
ω
ω
ω
Compared to the lowpass/4:1 transformer matching tech-
nique, this network delivers approximately 0.8dB higher
conversion gain (since the IF transformer loss is elimi-
nated) and comparable noise figure and IIP3. At a
±
15%
offset from the IF center frequency, conversion gain and
noise figure degrade about 1dB. Beyond
±
15%, conver-
sion gain decreases gradually but noise figure increases
rapidly. IIP3 is less sensitive to bandwidth. Other than IF
bandwidth, the most significant difference is LO-IF leak-
age, which degrades to approximately –38dBm compared
to the superior performance realized with the lowpass/4:1
transformer matching.
Discrete IF balun element values for four common IF
frequencies are listed in Table 5. The corresponding
measured IF output return losses are shown in Figure 11.
The values listed in Table 5 differ from the calculated
values slightly due to circuit board and component
parasitics. Typical conversion gain, IIP3 and LO-IF leak-
age, versus RF input frequency, for all four IF frequency
examples is shown in Figure 12. Typical conversion gain,
IIP3 and noise figure versus IF output frequency for the
same circuits are shown in Figure 13.
Table 5. Discrete IF Balun Element Values (R
OUT
= 50
)
IF FREQUENCY
(MHz)
190
240
380
450
L1, L2
(nH)
120
100
56
47
C6, C7
(pF)
6.8
4.7
3
2.7
L3
(nH)
220
220
68
47
For fully differential IF architectures, the IF transformer
can be eliminated. An example is shown in Figure 14,
where the mixer’s IF output is matched directly into a SAW
filter. Supply voltage to the mixer’s IF pins is applied
IF FREQUENCY (MHz)
–30
I
–20
–10
0
–25
–15
–5
150
250
350
450
5527 F11
550
100
50
200
300
400
500
190MHz
240MHz
380MHz
450MHz
Figure 11. IF Output Return Losses with Discrete Balun Matching
RF INPUT FREQUENCY (MHz)
1700
G
C
L
14
12
18
16
22
20
26
24
2500
5527 F12
10
6
4
2
8
–30
–20
–10
0
–40
–50
–60
1900
2100
2300
2700
190IF
240IF
380IF
450IF
LOW SIDE LO (–3dBm)
T
A
= 25
°
C
IIP3
LO-IF
G
C
Figure 12. Conversion Gain, IIP3 and LO-IF Leakage vs RF Input
Frequency Using Discrete IF Balun Matching
IF OUTPUT FREQUENCY (MHz)
150
G
C
,
12
10
18
16
14
20
550
5527 F13
8
6
0
250
350
450
200
300
400
500
4
2
26
24
22
IIP3
G
C
190IF
240IF
380IF
450IF
LOW SIDE LO (–3dBm)
T
A
= 25
°
C
SSB NF
Figure 13. Conversion Gain, IIP3 and SSB NF vs IF Output
Frequency Using Discrete IF Balun Matching
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