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參數(shù)資料
| 型號(hào)： | RF9678 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 無(wú)繩電話/電話 |
| 英文描述： | Multipole Connector |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC16 |
| 封裝： | 4 X 4 MM, LCC-16 |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大小： | 200K |
| 代理商： | RF9678 |
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Preliminary
5-96
RF9678
Rev A4 010622
5
M
U
As is shown above, the EVM performance of a modulator can be correlated to it's carrier and sideband suppression per-
formance.
Unadjusted Performance
A Wideband CDMA signal is a noise-like signal occupying a channel bandwidth of 3.84MHz. When viewed on a spec-
trum analyzer the channel appears as a plateau raised above the noise floor (see Figure 4). In some cases, it is normal
to see a spike over the center of the W-CDMA plateau. This will occur when the absolute power level of the unadjusted
carrier feedthrough is higher than that of the W-CDMA channel level. The cause of this phenomenon can be understood
by examining the relative powers of the carrier signal and the W-CDMA channel power.
For Example, a 1Hz channel with a power of 0dBm has an absolute power level of 0dBm when viewed on a spectrum
analyzer. When that 0dBm channel power is spread over a 3.84MHz channel, as in W-CDMA, it results in an absolute
channel power level of -65.8dBm (-10*log (BW)). The absolute channel level displayed on the spectrum analyzer will
increase with the resolution bandwidth setting on the instrument although the integrated channel power will remain con-
stant. A resolution bandwidth (RBW) of 30kHz will increase the displayed power level by 44.7dB (+10*log(RBW)) to -
21.0dBm. With a desired signal output power of +2.0dBm and a carrier suppression of >20dBc, the absolute carrier level
can be as high as -18.0dBm (P
OUT
-Suppression=Carrier Level). This will result in a 3dB carrier spike above the W-
CDMA channel level (see Figure 4). (Note: The relative height of the carrier spike above the W-CDMA channel level is
directly related to the RBW of the spectrum analyzer being used. The example above assumes a 30kHz RBW.)
The following equations may be used to calculate W-CDMA channel and carrier feedthrough levels.
W-CDMA Channel Level=Channel Power (Integrated over BW)-[10*log*(BW)]+[10*log*(RBW)]
Carrier Feedthrough=P
OUT
(Desired Sideband)-Carrier Suppression
The next section describes a procedure that may be used to dramatically reduce carrier feedthrough by tuning or opti-
mizing the modulator input signals.
A
CF
SR
380 MHz
3.84 MHz
Meas Signal
Constellation
Demod
QPSK
IMAG
T1
-1.875
1.875
REAL
EXT
0 dBm
Ref Lvl
-1.5
1.5
Date:
6.FEB.2001
00:38:12
Figure 3. DC Offset Error (Carrier Feedthrough)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| RF9678PCBA | TRI N RECP M FLG 4-28 |
| RF9908 | Circular Connector; Gender:Female; No. of Contacts:32; Series:Trident Neptune; Body Length:1.645"; Body Material:Plastic; Connector Shell Size:24; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:4-28 RoHS Compliant: Yes |
| RF9908PCBA | Multipole Connector |
| RF9938 | TRI N RECP M J/N 12-19 |
| RF9938PCBA | PCS UPCONVERTER/BPSK MODULATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RF9678PCBA | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:W-CDMA TRANSMIT MODULATOR AND IF AGC |
| RF9904 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RF Modulator/Demodulator |
| RF9906 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RF Mixer |
| RF9907 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single Radio Communication IF Amplifier |
| RF9908 | 制造商:RFMD 制造商全稱:RF Micro Devices 功能描述:CDMA/FM UPCONVERTER/BPSK MODULATOR |
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