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參數(shù)資料
| 型號： | LT5514EFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Ultralow Distortion IF Amplifier/ADC Driver with Digitally Controlled Gain |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 275K |
| 代理商： | LT5514EFE |
16
LT5514
5514f
For example, for R
OUT
= 200
, L1, L2 = 33nH results in
500MHz bandwidth.
The series inductor can extend the application bandwidth,
but it provides no improvement in linearity performance.
Series inductance may also produce peaking in the AC
response. This can be the case when (high Q) choke
inductors are used in an output interface such as in
Figure5, and the PCB trace (connection) to the load is too
long. Since the LT5514’s output impedance is relatively
high, the PCB trace acts as a series inductor. The most
direct solution is to shorten the connection lines by
placing the driver closer to the load. Another solution to
flatten the AC response is to place resistance close to the
LT5514 outputs. In this way the connection line behaves
more like a terminated transmission line, and the AC
peaking due to the capacitive load can be removed.
Bandpass Applications
For narrow band IF applications, the LT5514’s output
capacitance and the application load capacitance can be
incorporated as part of an LC impedance transformation
network, giving improved linearity performance for signal
frequencies greater than 100MHz. Figure 8 is an example
of such a network.
The network consists of two parallel resonant LC tank
circuits critically coupled by capacitors C1 and C2. The
R
OUT
to R
LOAD
transformation ratio in this particular
implementation is 2. The choice of impedance transfor-
mation ratio is more flexible than in the wideband case.
The LC network is a bandpass filter, a useful feature in
many applications.
A variety of bandpass matching network configurations
are conceivable, depending on the requirements of the
particular application. The design of these networks is
facilitated by the fact that the LT5514 outputs are not
destabilized by reactive loading.
Note that these LC networks may distort the output signal
if their amplitude and phase response exhibit nonlinear
behavior. For example, if resistors R1 and R2 in Figure 5
are replaced with LC resonant tank circuits, then severe
OIP3 degradation may occur (e.g., 4dB to 6dB at 200MHz).
Low Output Noise Floor Applications
In some applications the maximum output noise floor is
specified. The LT5514 output noise floor is elevated above
the available noise power (–174dBm/Hz into 50
) by the
NF + Gain. Consequently, reduction of the LT5514’s power
gain is the only way to reduce the output noise floor.
In fixed gain applications, the LT5514 can be set to 3dB
attenuation relative to maximum gain. As shown in the
Typical Performance Characteristics, this gives a 2.8dB
reduction in the output noise floor with no loss of linearity.
In general, the output noise floor can be reduced by
decreasing R
OUT
(and hence power gain), at the cost of
reduced OIP3.
In some situations, it may be feasible to use two LT5514
parts in parallel. In this case, the effective g
m
doubles,
APPLICATIU
W
U
U
–
+
100
C9
0.33
μ
F
T1
1:2
DUT
LT5514
R
OUT
200
IN
+
IN
–
C8
0.1
μ
F
PGA0 PGA1 PGA2 PGA3
R
SRC
50
V
SRC
V
CC
ENA
ENB
R
100
C6
2.2pF
GAIN = 33dB
OIP3 (LOAD) = +41dBm
UP TO 9dBm PER TONE
1dB BANDWIDTH:
f
L
= 130MHz
f
U
= 220MHz
C1
12pF
L6
56nH
L3
56nH
L5
56nH
C7
0.1
μ
F
NOTE:
C3 + C
LOAD
= 12pF
C4 + C
LOAD
= 12pF
C5
5.6pF
C4
C3
C2
12pF
L4
56nH
R
LOAD
50
C
LOAD
5514 F08
C
LOAD
V
OSUP
R
LOAD
50
TC2-1T
Figure 8. Bandpass Output Transformation Network Example
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