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參數(shù)資料
| 型號： | RF9678PCBA |
| 廠商： | RF Micro Devices, Inc. |
| 英文描述： | TRI N RECP M FLG 4-28 |
| 中文描述： | 的W - CDMA傳輸調(diào)制器和IF AGC |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 200K |
| 代理商： | RF9678PCBA |
Preliminary
5-99
RF9678
Rev A4 010622
5
M
U
Carrier Suppression Optimization
7) While maintaining a constant DC level (1.3V) on the "ISIG-" pin, adjust the DC level of the "ISIG+" input in as small an
increment (~1.0mV) as the test equipment will allow. Observe the output on the spectrum analyzer. Adjust the DC level
until the carrier signal is at a minimum. Typically, the minimum will occur within a ±20mV window of the reference voltage
(1.3±0.02V).
8) While maintaining a constant DC level (1.3V) on the "QSIG-" pin, adjust the DC level of the "QSIG+" input in as small
an increment as the test equipment will allow (1.0mV). Observe the output on the spectrum analyzer. Adjust the DC level
until the carrier signal is at a minimum. Typically, the minimum will occur within a ±20mV window of the reference voltage
(1.3±0.02V).
9) Repeating Steps 7 and 8 may yield slightly better suppression. The output spectrum should look similar to Figure 7.
(Note the suppressed carrier signal.)
Sideband Suppression Optimization
10) Adjust the AC amplitude of the "ISIG+" signal in as small an increment as the test equipment will allow (~1mV).
Observe the output of the spectrum analyzer. Adjust the AC amplitude of the signal until the sideband signal is at a mini-
mum. The minimum sideband signal level should occur within ±20mV adjustment. (0.500±0.02V)
11) Adjust the AC amplitude of the "QSIG+" signal in as small an increment as the test equipment will allow (~1mV).
Observe the output of the spectrum analyzer. Adjust the AC amplitude of the signal until the sideband signal is at a mini-
mum. The minimum sideband signal level should occur within ±20mV adjustment (0.500±0.02V).
12) Adjust the phase of the "QSIG+" signal in as small an increment as the test equipment will allow (`0.1°). Observe the
output of the spectrum analyzer. Adjust the phase of the "QSIG+" signal until the sideband suppression is at a minimum.
The sideband signal should reach a minimum within ±1° of adjustment (90±1°).
13) The device is now optimized for maximum carrier and sideband suppression. The output spectrum should look simi-
lar to Figure 8. (Note the suppressed carrier and sideband signals.)
A
Unit
dBm
1RM
15 dBm
Ref Lvl
RF Att
40 dB
32.5 kHz/
Center 380 MHz
Span 325 kHz
EXT
RBW
VBW
SWT
5 kHz
50 kHz
33 ms
-80
-70
-60
-50
-40
-30
-20
-10
0
10
1
Marker 1 [T1]
0.22 dBm
379.84987475 MHz
Date:
6.FEB.2001
00:55:31
Figure 7. Optimized Carrier Suppression
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