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參數(shù)資料
| 型號(hào)： | AD734 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 10 MHz, 4-Quadrant Multiplier/Divider(10MHz,四象限乘法器/除法器) |
| 中文描述： | 10兆赫，四象限乘法器/除法器（10MHz的，四象限乘法器/除法器） |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 283K |
| 代理商： | AD734 |
AD734
REV. B
–10–
SQUARE WAVE
SINE WAVE
TRI-WAVE
10k
100k
INPUT FREQUENCY – Hz
1M
10M
100
10
1
100m
10m
1m
100μ
O
Figure 16. RMS-DC Converter Performance
LOW DIST ORT ION MIX E R
T he AD734’s low noise and distortion make it especially
suitable for use as a mixer, modulator, or demodulator.
Although the AD734’s –3 dB bandwidth is typically 10 MHz
and is established by the output amplifier, the bandwidth of its
X and Y interfaces and the multiplier core are typically in excess
of 40 MHz. T hus, provided that the desired output signal is less
than 10 MHz, as would typically be the case in demodulation,
the AD734 can be used with both its X and Y input signals as
high as 40 MHz. One test of mixer performance is to linearly
combine two closely spaced, equal-amplitude sinusoidal signals
and then mix them with a third signal to determine the mixer’s
2-tone T hird-Order Intermodulation Products.
1
2
3
4
5
6
7
10
8
9
11
13
12
14
W
ER
VN
VP
DD
Z1
Z2
X1
X2
U1
U2
U0
Y1
Y2
AD734
0.1μF
0.1μF
+15V
–15V
2k
HP3326A
COMBINE
A + B
DATEL
DVC-8500
HP3326A
HIGH VOLTAGE
OPTION
HP3585A
WITH 10X PROBE
dBm REF TO 50
AD707
Figure 17. AD734 Mixer Test Circuit
Figure 17 shows a test circuit for measuring the AD734’s perfor-
mance in this regard. In this test, two signals, at 10.05
MHz and
9.95 MHz are summed and applied to the AD734’s X interface.
A second 9 MHz signal is applied to the AD734’s Y interface.
T he voltage at the U interface is set to 2 V to use the full
dynamic range of the AD734. T hat is, by connecting the W and
Z1 pins together, grounding the Y2 and X 2 pins, and setting
U = 2 V, the overall transfer function is
W
=
X
1
Y
1
2
V
(14)
and W can be as high as 20 V p-p when X 1 = 2 V p-p and Y1 =
10 V p-p. T he 2 V p-p signal level corresponds to +10 dBm into
a 50
input termination resistor connected from X 1 or Y1 to
ground.
If the two X 1 inputs are at frequencies f
1
and f
2
and the
frequency at the Y1 input is f
0
, then the two-tone third-order
intermodulation products should appear at frequencies 2f
1
– f
2
±
f
0
and 2f
2
– f
1
±
f
0
. Figures 18 and 19 show the output spectra of
the AD734 with f
1
= 9.95 MHz, f
2
= 10.05 MHz, and f
0
=
9.00 MHz for a signal level of f
1
& f
2
of 6 dBm and f
0
of
+24 dBm in Figure 18 and f
1
& f
2
of 0 dBm and f
0
of +24 dBm
in Figure 19. T his performance is
without
external trimming of
the AD734’s X and Y input-offset voltages.
T he possible T wo T one Intermodulation Products are at 2
×
9.95 MHz – 10.05 MHz
±
9.00 MHz and 2
×
10.05 –
9.95 MHz
±
9.00 MHz; of these only the third-order products
at 0.850 MHz and 1.150 MHz are within the 10 MHz band-
width of the AD734; the desired output signals are at
0.950 MHz and 1.050 MHz. Note that the difference (Figure
18) between the desired outputs and third-order products is
approximately 78 dB, which corresponds to a computed
third-order intercept point of +46 dBm.
Figure 18. AD734 Third-Order Intermodulation Performance
for f
1
= 9.95 MHz, f
2
= 10.05 MHz, and f
0
= 9.00 MHz and for
Signal Levels of f
1
& f
2
of 6 dBm and f
0
of +24 dBm. All Dis-
played Signal Levels Are Attenuated 20 dB by the 10X Probe
Used to Measure the Mixer’s Output
Figure 19. AD734 Third-Order Intermodulation Performance
for f
1
= 9.95 MHz, f
2
= 10.05 MHz, and f
0
= 9.00 MHz and for
Signal Levels of f
1
& f
2
of 0 dBm and f
0
of +24 dBm. All Dis-
played Signal Levels Are Attenuated 20 dB by the 10X Probe
Used to Measure the Mixer’s Output
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