參數(shù)資料
型號(hào)： MAX2101
廠商： Maxim Integrated Products, Inc.
英文描述： 16-Bit Buffers/Drivers With 3-State Outputs 48-TSSOP -40 to 85
中文描述： 6位正交數(shù)字化儀
文件頁(yè)數(shù)： 17/24頁(yè)
文件大?。?/td> 217K
代理商： MAX2101
At frequencies of interest, C
PAD
will add a small phase
error to the impedance term. The inductance L
BW
mod-
els the bond wire and lead frame in series with the
input amplifier. This inductor represents a significant
portion of the input impedance, and will contribute the
majority of the variation in input impedance as the input
frequency is swept from 400MHz to 700MHz. These
variables combine to produce an actual input imped-
ance versus frequency (Figure 13).
As a result, it is challenging to achieve an extremely low
VSWR for the input of a monolithic amplifier, especially
over a wide range of frequencies. The MAX2101 provides
a VSWR less than 2:1, and delivers this performance over
the wide range of anticipated IFs currently considered.
Fortunately, for DBS, TVRO, and related applications, the
UHF IF is relatively narrow band, allowing the use of stan-
dard techniques for narrow-band impedance matching.
Narrow-Band Match
Many references cover narrow-band matching tech-
niques. The match network synthesis is simplified by
assuming the impedance of the source driving the
MAX2101’s IFIN port is positive, real, and equal to 50
.
For a given IF, you can simply use a Smith chart to
“map” an impedance to the intended source resis-
tance. Using a two-element matching network, you can
choose the element next to the input (C
SH
in Figure 14)
to translate the real portion of the impedance to match
the source resistance. The second element (L
SER
in
Figure 14) cancels the reactive component of the net-
work (including the effect of C
SH
), resulting in a real,
matched input impedance that provides maximum
power transfer. The transformation uses only reactive
elements so that no additional resistive thermal noise is
added, which would degrade the noise figure.
Figure 14 shows the resulting impedance matching net-
work. The incident signal is AC coupled by C
C
. L
SER
and C
SH
are the matching elements. C
SH
includes
board layout capacitance. The values of these ele-
M
6-Bit Quadrature Digitizer
______________________________________________________________________________________
17
Q1
Q2
R
I
R
F
R
F
C
PAD
L
BW
V
CC
L
BW
C
PAD
R
I
Q4
Q3
R
E
R
E
IFIN
(PIN 90)
IFINB
(PIN 91)
Figure 12. Equivalent Input Network
80
-40
200
900
IFIN (PIN 90) INPUT IMPEDENCE vs.
FREQUENCY
40
60
M
FREQUENCY (MHz)
Z
I
)
500
0
-20
300
400
700
20
600
800
RE (Z
IN
)
T
A
= +25°C
V
CC
= 5V
R
= 50
IFINB (PIN 91) AC TERMINATED IN 25
IM (Z
IN
)
Figure 13. Typical MAX2101 IFIN Z
IN
vs. Frequency (Zs = 50)
相關(guān)PDF資料
PDF描述
MAX2101CMQ 16-Bit Buffers/Drivers With 3-State Outputs 48-TSSOP -40 to 85
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