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ADRF6518 Datasheet(PDF) 31 Page - Analog Devices

No. de pieza ADRF6518
Descripción Electrónicos  1.1 GHz Variable Gain Amplifiers Baseband Programmable Filters
Download  39 Pages
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADRF6518 Datasheet(HTML) 31 Page - Analog Devices

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Data Sheet
ADRF6518
Rev. A | Page 31 of 39
EFFECT OF FILTER BW ON EVM
Figure 84 shows how changing the filter BW affects the EVM
for signals at several different symbol rates. The x-axis is
normalized such that it displays the baseband bandwidth of
each respective signal to the set filter corner. For example, a
filter corner of 10 MHz and a signal with a baseband bandwidth
of 5 MHz yields 2 Hz/Hz. Similarly, a filter corner of 50 MHz
and a signal with a baseband bandwidth of 25 MHz also yields
2 Hz/Hz. Baseband bandwidth is defined by the following:

2
1
)
(
Rate
Symbol
BW
BB
The general behavior shows that the higher the ratio of the filter
corner to baseband bandwidth is, the better the EVM. This
behavior starts to plateau at around a 2× ratio. This behavior
affects the higher bandwidth signal more so than the smaller
bandwidth signals. The primary reason for this behavior is that
the noise is not flat across frequency (there is some interaction
between the filters and all the gain stages). The noise shaping
degrades EVM as the filter corner starts to encroach well
outside of the signal bandwidth.
Figure 84. EVM vs. Filter Corner/Baseband BW Ratio over Symbol Rate,
Filter Corner = 63 MHz, QPSK, 1.5 V p-p Output Level, −20 dBm Input Power
PULL-DOWN RESISTORS FOR DISABLE FUNCTION
The ADRF6518 offers a disable function, by pulling ENBL low,
that brings the supply current to approximately 1 mA. For the
function to work correctly, a dc path to ground must be
established on the output pins (OPP1, OPM1, OPP2, OPM2) to
allow proper discharge of the postamplifier. Figure 85 shows
how to properly place the pull-down resistors. The resistor
value must be big enough so that it does not interfere with the
output impedance that the postamplifer sees (for example, 400 Ω),
but not so big that it prevents proper discharge, effectively
becoming an open circuit. For most applications, a value of
RPULLDOWN = 10 kΩ sufficiently satisfies these conditions.
INSTABILITY AT HIGH GAIN IN FILTER BYPASS
MODE
The user must be cautious while operating the ADRF6518 at the
highest of gains in filter bypass mode. Due to the high gain (up
to 66 dB) and wide bandwidth (up to 350 MHz with maximum
digital gains), the ADRF6518 is susceptible to oscillations when
it is in filter bypass mode and its gain is set above 60 dB. The
oscillation manifests itself with a broadband rise in the noise
floor and significantly degrades the SNR and EVM. Orthogonal
input to output signal paths on the printed circuit board (PCB)
helps reduce this oscillation. This can be seen in the top layer
silkscreen, shown in Figure 92. It is recommended that any
posts or headers not be placed for measurement purposes on
the signal paths, especially the output signal paths. Doing so
causes the output signal to radiate back to the input and induce
the oscillation at even lower gains than 60 dB.
Figure 85. Pull-Down Resistors
0
–50
–45
–40
–35
–30
–25
–20
–15
–10
–5
010
9
8
7
6
5
4
3
2
1
FILTER CORNER/BASEBAND BANDWIDTH (Hz/Hz)
5MSPS
10MSPS
20MSPS
50MSPS
VPSD
COMD
LE
CLK
DATA
SDO/RST
VICM/AC
VPI
OPP1
OPM1
COM
VGN3
VOCM
COM
OPM2
OPP2
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
ADRF6518
I
TO NEXT STAGE
Q
TO NEXT STAGE
RPULLDOWN
RPULLDOWN
RPULLDOWN
RPULLDOWN


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