參數(shù)資料
型號(hào)： OPA640
英文描述： Wideband Voltage Feedback OPERATIONAL AMPLIFIER
中文描述： 寬帶電壓反饋運(yùn)算放大器
文件頁(yè)數(shù)： 11/13頁(yè)
文件大小： 190K
代理商： OPA640
OPA640
11
DISTORTION
The OPA640’s Harmonic Distortion characteristics vs fre-
quency and power output are shown in the Typical Perfor-
mance Curves. Distortion can be further improved by in-
creasing the load resistance. Refer to Figure 6. Remember to
include the contribution of the feedback resistance when
calculating the effective load resistance seen by the ampli-
fier.
FIGURE 6. 5MHz Harmonic Distortion vs Load Resistance.
The third-order intercept point is an important parameter for
many RF amplifier applications. Figure 7 shows the
OPA640’s single tone, third-order intercept vs frequency.
This curve is particularly useful for determining the magni-
tude of the third harmonic as a function of frequency, load
resistance, and gain. For example, assume that the applica-
tion requires the OPA640 to operate in a gain of +1V/V and
drive 2Vp-p into 50
at a frequency of 10MHz. Referring to
Figure 11 we find that the intercept point is +47dBm. The
magnitude of the third harmonic can now be easily calcu-
lated from the expression:
Third Harmonic (dBc) = 2(OPI
3
P – P
O
)
where OPI
3
P = third-order intercept, dBm
P
O
= output level, dBm
For this case OPI
3
P = 47dBm, P
= 47dBm, and the third
Harmonic = 2(47 – 10) = 74dB below the fundamental tone.
The OPA640’s low distortion makes the device an excellent
choice for a variety of RF signal processing applications.
The value for the two-tone, third-order intercept is typically
8dB lower than the single tone value.
FIGURE 7. Single-Tone , 3rd-Order Intercept Point vs Fre-
quency.
NOTE: Feedback Resistance used was 402
.
NOISE FIGURE
The OPA640 voltage and current noise spectral densities are
specified in the Typical Performance Curves. For RF appli-
cations, however, Noise Figure (NF) is often the preferred
noise specification since it allows system noise performance
to be more easily calculated. The OPA640’s Noise Figure vs
Source Resistance is shown in Figure 8.
FIGURE 8. Noise Figure vs Source Resistance.
–70
–80
–90
–100
10
Load Resistance (
)
H
20
50
100
200
500
1k
2f
O
3f
O
N
Source Resistance (
)
10
100
1k
10k
25
20
15
10
5
0
100k
NF = 10 LOG 1 +
e
n2
+ (I
n
R
S
)
2
4KTR
S
+60
+50
+40
+30
+20
Frequency (Hz)
10M
100M
1M
T
相關(guān)PDF資料
PDF描述
OPA640P Wideband Voltage Feedback OPERATIONAL AMPLIFIER
OPA640U Wideband Voltage Feedback OPERATIONAL AMPLIFIER
OPA640UB Wideband Voltage Feedback OPERATIONAL AMPLIFIER
OPA642 Wideband, Low Distortion, Low Gain OPERATIONAL AMPLIFIER
OPA642N Wideband, Low Distortion, Low Gain OPERATIONAL AMPLIFIER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OPA640P 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:
OPA640U 制造商:BB 制造商全稱:BB 功能描述:Wideband Voltage Feedback OPERATIONAL AMPLIFIER
OPA640UB 制造商:Rochester Electronics LLC 功能描述:- Bulk
OPA641 制造商:BB 制造商全稱:BB 功能描述:Wideband Voltage Feedback OPERATIONAL AMPLIFIER
OPA641H 制造商:BB 制造商全稱:BB 功能描述:Wideband Voltage Feedback OPERATIONAL AMPLIFIER
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