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參數(shù)資料
| 型號： | OPA620SG |
| 英文描述： | Wideband Precision OPERATIONAL AMPLIFIER |
| 中文描述： | 寬帶高精度運算放大器 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 309K |
| 代理商： | OPA620SG |
13
OPA620
DISTORTION
The OPA620’s harmonic distortion characteristics into a
50
load are shown vs frequency and power output in the
Typical Performance Curves. Distortion can be further im-
proved by increasing the load resistance as illustrated in
Figure 8. Remember to include the contribution of the
feedback resistance when calculating the effective load
resistance seen by the amplifier.
FIGURE 8. 10MHz Harmonic Distortion vs Load Resistance.
G = +1V/V
V = 2Vp-p
10MHz HARMONIC DISTORTION
vs LOAD RESISTANCE
–40
–50
–60
–70
–80
–90
0
100
200
300
400
500
H
Load Resistance ( )
G = +2V/V
3f
2f
Two-tone third-order intermodulation distortion (IM) is an
important parameter for many RF amplifier applications.
Figure 9 shows the OPA620’s two-tone third-order IM
intercept vs frequency. For these measurements, tones were
spaced 1MHz apart. This curve is particularly useful for
determining the magnitude of the third-order IM products as
a function of frequency, load resistance, and gain. For
example, assume that the application requires the OPA620
to operate in a gain of +2V/V and drive 2Vp-p (4dBm for
each tone) into 50
at a frequency of 10MHz. Referring to
Figure 9 we find that the intercept point is +40dBm. The
magnitude of the third-order IM products can now be easily
calculated from the expression:
Third IMD = 2(OPI
3
P – P
O
)
where OPI
3
P = third-order output intercept, dBm
P
= output level/tone, dBm/tone
Third IMD = third-order intermodulation ratio
below each output tone, dB
For this case OPI
3
P = 40dBm, P
= 4dBm, and the third-
order IMD = 2(40 – 10) = 72dB below either 4dBm tone.
The OPA620’s low IMD makes the device an excellent
choice for a variety of RF signal processing applications.
FIGURE 9. 2-Tone, 3rd Order Intermodulation Intercept vs
Frequency.
0
10
20
30
40
50
60
70
80
90
100
10
15
20
25
30
35
40
45
50
55
G = +1V/V
R
L
P
OUT
P
OUT
250
250
R
L
60
–
+
–
+
G = +2V/V
G = +1V/V
Frequency (MHz)
I
R = 50
R = 100
G = +2V/V
R = 50
R = 100
R = 400
R = 400
2-TONE, 3
RD
ORDER INTERMODULATION
INTERCEPT vs FREQUENCY
NOISE FIGURE
The OPA620’s voltage and current noise spectral densities
are specified in the Typical Performance Curves. For RF
applications, however, Noise Figure (NF) is often the
preferred noise specification since it allows system noise
performance to be more easily calculated. The OPA620’s
Noise Figure vs Source Resistance is shown in Figure 10.
NOISE FIGURE vs SOURCE RESISTANCE
25
20
15
10
5
0
10
100
1k
10k
100k
N
Source Resistance ( )
NF
dB
= 10log 1 +
e
n
2
+ (i
n
R
S
)
2
4kTR
S
FIGURE 10. Noise Figure vs Source Resistance.
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相關代理商/技術參數(shù) |
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| OPA621 | 制造商:BB 制造商全稱:BB 功能描述:Wideband Precision OPERATIONAL AMPLIFIER |
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| OPA621KP-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OPA621KU | 制造商:BB 制造商全稱:BB 功能描述:Wideband Precision OPERATIONAL AMPLIFIER |
| OPA622 | 制造商:BB 制造商全稱:BB 功能描述:Wide-Bandwidth OPERATIONAL AMPLIFIER |
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