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參數(shù)資料
| 型號： | LT5503 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.2GHz to 2.7GHz Direct IQ Modulator and Mixer |
| 中文描述： | 1.2GHz至2.7GHz的直接IQ調(diào)制器和調(diào)音臺 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大小： | 210K |
| 代理商： | LT5503 |
LT5503
15
APPLICATIOU
W
U
U
Pin 16 should be connected externally to V
CC
through a
low value series resistor (47
typical). To assure proper
output power control, a good, local high frequency AC
ground for Pin 16 is essential. The MODOUT port of the
VGA is an open collector configuration. An inductor with
high self resonance frequency is required to connect
Pin 17 to V
CC
as a DC return path, and as a part of the
output matching network. Additional matching compo-
nents are required to drive a 50
load as shown in
Figure2. The amplifier is designed to operate in Class A for
low distortion performance. The typical output 1dB com-
pression point (P1dB) is –3dBm at 2.45GHz. When the
differential baseband input voltages are higher than 1V
P-P
,
the VGA operates in Class AB mode, and the distortion
performance of the modulator is degraded. The logic
control inputs do not draw current when they are low. They
draw about 2
μ
A each when high.
Mixer LO1 Port
The mixer LO1 input port is the linear input to the mixer.
It consists of an active balun amplifier designed to operate
over the 1.4GHz to 2.4GHz frequency range. There is a
linear relationship between LO1 input power and
MIXRFOUT power for LO1 input levels up to approximately
–20dBm. After that, the mixer output begins to compress.
When operated in the recommended –14dBm to –8dBm
input power range, the mixer is well compressed, which in
turn creates a stable output level for the modulator input.
As shown in Figure 2, a simple lowpass matching network
is required to match this pin to 50
. This pin is internally
biased, therefore an AC-coupling capacitor is required.
Mixer LO2 Port
The mixer LO2 port is designed to operate in the 50MHz to
1000MHz range. The first stage is a limiting amplifier. This
stage produces the correct output levels to drive the
internal divider circuit reliably, with LO2 input levels down
to –20dBm. The output of the divider then drives another
stage, which in turn switches the nonlinear inputs of the
double-balanced mixer. Note that the mixer output will
produce broadband noise if the LO2 signal level is too low.
The input amplifier is designed for a good match over the
entire frequency range. The only requirement (Figure 2) is
an external AC-coupling capacitor.
Mixer Output Ports (MX
+
/MX
–
)
The mixer output is a differential open collector configura-
tion. Bias current is supplied to these two pins through the
center tap of a balun as shown in Figure 2. Simple lowpass
matching is used to transform each leg of the mixer output
to 25
for the balun’s 50
input impedance.
The balun approach provides the highest output power
and best LO1 suppression, but is not absolutely neces-
sary. It is also possible to match each output to 50
and
couple power from one output. The unused output should
be terminated in the same characteristic impedance. In
this case, output power is approximately 2dB lower and
LO1 suppression degrades to approximately 15dBc. A
schematic for this approach is shown in Figure 6 where
inductors LB
+
and LB
–
supply bias current to the mixer’s
differential outputs, and resistor R
TERM
terminates the
unused output.
5503 F06
10
11
R
TERM
51
LB
+
MX
+
MX
–
LB
–
V
CC
L5
C5
C9
C
BYPASS
C6
L6
MIXRFOUT
Figure 6. 50
Mixer Output Matching Without a Balun
1.9GHz
5.6nH
1.8pF
15pF
2.4GHz
2.7nH
0.68pF
8.2pF
L5,L6
C5, C6
C9
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT5503_09 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.2GHz to 2.7GHz Direct IQ Modulator and Mixer |
| LT5503EFE | 功能描述:IC DIRECT IQ MOD/MIXER 20-TSSOP RoHS:否 類別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:調(diào)制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT5503EFE#PBF | 功能描述:IC DIRECT IQ MOD/MIXER 20-TSSOP RoHS:是 類別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:調(diào)制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT5503EFE#TR | 功能描述:IC DIRECT IQ MOD/MIXER 20-TSSOP RoHS:否 類別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:調(diào)制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LT5503EFE#TRPBF | 功能描述:IC DIRECT IQ MOD/MIXER 20-TSSOP RoHS:是 類別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:調(diào)制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤 包裝:帶卷 (TR) |
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