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參數資料
型號: AD8341
廠商: Analog Devices, Inc.
元件分類: 調制器/解調器
英文描述: 1.5 GHz to 2.4 GHz RF Vector Modulator
中文描述: 1.5 GHz至2.4 GHz射頻矢量調制器
文件頁數: 16/20頁
文件大小: 556K
代理商: AD8341
AD8341
As the output power drops, the noise floor, measured in dBm in
1 MHz BW at 50 MHz carrier offset, drops slightly.
Rev. 0 | Page 16 of 20
0
–30
–80
–75
–70
–65
–60
–55
–50
–45
–40
–35
A
–30
–25
–20
–15
–10
–5
0
5
OUTPUT POWER (dBm)
–50
–55
–60
–65
–70
–75
–80
–85
–90
–95
–100
N
ACPR 5MHz OFFSET
ACPR 10MHz OFFSET
NOISE –50MHz OFFSET
Figure 39. AD8341 ACPR and Noise vs. Output Power;
Single-Carrier WCDMA (Test Model 1-64 at 2140 MHz)
Figure 40 shows how output power, ACPR, and noise vary with
the differential I and Q control voltages. V
BBI
and V
BBQ
are tied
together and are varied from 0.5 V to 50 mV.
0
0
–50
–45
–40
–35
–30
–25
–20
–15
–10
–5
O
0
0.1
0.2
0.3
0.4
0.5
IQ CONTROL VOLTAGE
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
A
N
OUTPUT POWER dBm
ACPR 10MHz OFFSET
NOISE –50MHz OFFSET
ACPR 5MHz OFFSET
Figure 40. AD8341 Output Power, ACPR and Noise vs. V
IQ
.
Single-Carrier WCDMA (Test Model 1-64 at 2140 MHz)
In this case, adjacent channel power ratio remains constant as
the (noise dominated) alternate channel power degrades
roughly 1-for-1 with output power. As the I and Q control volt-
age drops, the noise floor again drops slowly.
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