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參數(shù)資料
| 型號(hào)： | OPA4658U |
| 英文描述： | Quad Wideband, Low Power Current Feedback OPERATIONAL AMPLIFIER |
| 中文描述： | 四組寬頻，低功耗電流反饋運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 11/14頁(yè) |
| 文件大?。?/td> | 247K |
| 代理商： | OPA4658U |
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OPA4658
–50
–60
–70
–80
–90
–100
Load Resistance (
)
H
10
100
1k
2f
O
3f
O
G = +2
The third-order intercept is an important parameter for many
RF amplifier applications. Figure 6 shows the OPA4658’s
two tone, third-order intercept vs frequency. This curve is
particularly useful for determining the magnitude of the
third harmonic as a function of frequency, load resistance,
and gain. For example, assume that the application requires
the OPA4658 to operate in a gain of +2V/V and drive
2Vp-p into 100
at a frequency of 10MHz. Referring to
Figure 6 we find that the intercept point is +38dBm. 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 output intercept, dBm
P
O
= output level, dBm
For this case OPI
3
P = 38dBm, P
O
= 7dBm, and the third
Harmonic = 2(38 – 7) = 62dB below the fundamental. The
OPA4658’s low distortion makes the device an excellent
choice for a variety of RF signal processing applications.
CROSSTALK
Crosstalk is the undesired result of the signal of one channel
mixing with and reproducing itself in the output of another
channel or channels. Crosstalk is inclined to occur in most
multichannel integrated circuits. In quad devices, the effect of
crosstalk is measured by driving three channels and observing
the output of the undriven channel over various frequencies.
The magnitude of this effect is referenced in terms of channel-
to-channel isolation and expressed in decibels. Input referred
points to the fact that there is a direct correlation between gain
and crosstalk, therefore at increased gain, crosstalk also in-
creases by a factor equal to that of the gain. Figure 7 illustrates
the measured effect of crosstalk in the OPA4658U.
FIGURE 5. 5MHz Harmonic Distortion vs Load Resistance.
FIGURE 6. Third Order Intercept Point vs Frequency.
70
60
50
40
30
20
100k
1M
10M
100M
T
Frequency (Hz)
G = +2
(G = +2, R
L
= 100
, R
FB
= 402
)
FIGURE 8. Configuration for Testing Differential Gain/Phase.
OPA4658
75
75
402
402
75
75
TEK TSG 130A
TEK VM700A
1/4
DIFFERENTIAL GAIN AND PHASE
Differential Gain (DG) and Differential Phase (DP) are criti-
cal specifications for video applications. DG is defined as the
percent change in closed-loop gain over a specified change in
output voltage level. DP is defined as the change in degrees of
the closed-loop phase over the same output voltage change.
Both DG and DP are specified at the NTSC sub-carrier
frequency of 3.58MHz and the PAL subcarrier of 4.43MHz.
All NTSC measurements were performed using a Tektronix
model VM700A Video Measurement Set.
DG and DP of the OPA4658 were measured with the amplifier
in a gain of +2V/V with 75
input impedance and the output
back-terminated in 75
. The input signal selected from the
generator was a 0V to 1.4V modulated ramp with sync pulse.
With these conditions the test circuit shown in Figure 8
delivered a 100IRE modulated ramp to the 75
input of the
video analyzer. The signal averaging feature of the analyzer
FIGURE 7. Channel-to-Channel Isolation (three active channels).
Frequency (Hz)
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
1M
10M
100M
I
G = +2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA4658U/2K5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OPA4658UB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OPA4684 | 制造商:BB 制造商全稱:BB 功能描述:Wideband, Low-Power, Current Feedback Operational Amplifier |
| OPA4684ID | 功能描述:高速運(yùn)算放大器 Quad Low-Power Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA4684IDBW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:QUAD LOW-POWER CURRENT-FEEDBACK OPERATIONAL AMPLIFIER |
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