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參數(shù)資料
| 型號： | ADRF6801ACPZ-R7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | 750 MHz - 1150 MHz RF/MICROWAVE I/Q DEMODULATOR |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, MO-220VJJD-2, CP-40-1, LFSCP_VQ, 40 PIN |
| 文件頁數(shù)： | 16/36頁 |
| 文件大?。?/td> | 1034K |
| 代理商： | ADRF6801ACPZ-R7 |
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ADRF6801
Rev. 0 | Page 23 of 36
EVM MEASUREMENTS
EVM is a measure used to quantify the performance of a digital
radio transmitter or receiver. A signal received by a receiver has
all constellation points at their ideal locations; however, various
imperfections in the implementation (such as magnitude imbalance,
noise floor, and phase imbalance) cause the actual constellation
points to deviate from their ideal locations.
In general, a demodulator exhibits three distinct EVM limitations
vs. received input signal power. As signal power increases, the
distortion components increase. At large enough signal levels,
where the distortion components due to the harmonic non-
linearities in the device are falling in-band, EVM degrades
as signal levels increase. At medium signal levels, where the
demodulator behaves in a linear manner and the signal is well
above any notable noise contributions, the EVM has a tendency to
reach an optimal level determined dominantly by either quadrature
accuracy and I/Q gain match of the demodulator or the precision
of the test equipment. As signal levels decrease, such that the
noise is the major contribution, the EVM performance vs. the
signal level exhibits a decibel-for-decibel degradation with
decreasing signal level. At lower signal levels, where noise proves
to be the dominant limitation, the decibel EVM proves to be
directly proportional to the SNR.
The basic test setup to test EVM for the ADRF6801 consisted
of an Agilent E4438C, which was used as a signal source. The
900 MHz modulated signal was driven single ended into the
RFIN SMA connector of the ADRF6801 evaluation board. The
IQ baseband outputs were taken differentially into two AD8130
difference amplifiers to convert the differential signals into single-
ended signals. A Hewlett Packard 89410A VSA was used to sample
and calculate the EVM of the signal. The ADRF6801 IQ base-
band output pins were presented with a 450 Ω differential load
impedance.
The ADRF6801 shows excellent EVM performance for 16 QAM.
Figure 41 shows the EVM of the ADRF6801 being better than
40 dB over a RF input range of about +35 dB for the 16 QAM
modulated signal at a 10 MHz symbol rate. The pulse shaping
filter’s roll-off (alpha) was set to 0.35.
–45
–40
–35
–30
–25
–20
–15
–10
–5
0
–65
–55
–45
–35
–25
–15
–5
5
15
EVM
(
d
B
)
INPUT POWER (dBm)
09
576
-04
2
Figure 41. EVM vs. Input Power, EVM Measurements at fRF = 900 MHz;
fIF = 0 MHz (that is, Direct Down Conversion); 16 QAM; Symbol Rate = 10 MHz
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| ADRF6806-EVALZ | 制造商:Analog Devices 功能描述:EVALUATION BOARD - Boxed Product (Development Kits) 制造商:Analog Devices 功能描述:EVAL 525MHZ QUAD DEMOD ADRF6806 制造商:Analog Devices 功能描述:ADRF6806, QUAD DEMOD, EVAL BOARD; Silicon Manufacturer:Analog Devices; Features:IQ Demodulator with Integrated Fractional-N PLL, Integrated PLL & VCO; SVHC:No SVHC (19-Dec-2012) ;RoHS Compliant: Yes 制造商:Analog Devices 功能描述:MODULATOR/DEMODULATOR |
| ADRF6807 | 制造商:AD 制造商全稱:Analog Devices 功能描述:700 MHz to 1050 MHz Quadrature |
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