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參數(shù)資料
| 型號： | OPA646 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Low Power, Wide Bandwidth Operational Amplifier(低功耗寬帶運算放大器) |
| 中文描述： | 低功耗，寬帶運算放大器（低功耗寬帶運算放大器） |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 155K |
| 代理商： | OPA646 |
OPA646
11
–40
–50
–60
–70
–80
–90
–100
Load Resistance (
)
10
20
50
100
200
500
1K
H
3f
O
2f
O
(G = +1, f
O
= 5MHz)
NOISE FIGURE
The OPA646 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 OPA646’s Noise Figure vs
Source Resistance is shown in Figure 7.
FIGURE 7. Noise Figure vs Source Resistance.
FIGURE 6. 5MHz Harmonic Distortion vs Load Resistance
with R
F
= 402
.
DISTORTION
The OPA646’s harmonic distortion characteristics into a
100
load are shown vs frequency and power output in the
Typical Performance Curves. Distortion can be significantly
improved by increasing the load resistance as illustrated in
Figure 6. Remember to include the contribution of the
feedback resistance when calculating the effective load
resistance seen by the amplifier.
SPICE MODELS
Computer simulation using SPICE is often useful when
analyzing the performance of analog circuits and systems.
This is particularly true for Video and RF amplifier circuits
where parasitic capacitance and inductance can have a major
effect on circuit performance. SPICE models are available
for the OPA646. Contact Burr-Brown Applications Depart-
ment to receive a spice diskette.
DEMONSTRATION BOARDS
Demonstration boards to speed prototyping are available.
Refer to the DEM-OPA64X Data Sheet for details.
25
20
15
10
5
0
10
Source Resistance (
)
N
100
1k
10k
100k
NF = 10 LOG 1 +
e
n2
+ (I
n
R
S
)
2
4KTR
S
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| OPA646 WAF | 制造商:Texas Instruments 功能描述: |
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| OPA646UB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OPA648 | 制造商:BB 制造商全稱:BB 功能描述:ULTRA-WIDEBAND CURRENT FEEDBACK OPERATIONAL AMPLIFIER |
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