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LMH6628MAX データシート(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LMH6628MAX
部品情報  Dual Wideband, Low Noise, Voltage Feedback Op Amp
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMH6628MAX データシート(HTML) 10 Page - National Semiconductor (TI)

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Application Section (Continued)
A current source, built around Q1, provides the necessary
bias current for the second amplifier and prevents saturation
when power is applied. The resistor, R, closes the loop while
diode D2 prevents negative saturation when V
IN is less than
V
C. A MOS-type switch (not shown) can be used to reset the
capacitor’s voltage.
The maximum speed of detection is limited by the delay of
the op amps and the diodes. The use of Schottky diodes will
provide faster response.
ADJUSTABLE OR BANDPASS EQUALIZER
A "boost" equalizer can be made with the LMH6628 by
summing a bandpass response with the input signal, as
shown in Figure 7.
The overall transfer function is shown in Eq. 5.
(4)
To build a boost circuit, use the design equations Eq. 6 and
Eq. 7.
(5)
(6)
Select R
2 and C using Eq. 6. Use reasonable values for high
frequency circuits - R
2 between 10
Ω and 5kΩ, C between
10pF and 2000pF. Use Eq. 7 to determine the parallel com-
bination of R
a and Rb. Select Ra and Rb by either the 10
Ω to
5k
Ω criteria or by other requirements based on the imped-
ance V
in is capable of driving. Finish the design by determin-
ing the value of K from Eq. 8.
(7)
Figure 8 shows an example of the response of the circuit of
Figure 9, where f
o is 2.3MHz. The component values are as
follows: R
a=2.1k
Ω,R
b = 68.5
Ω,R
2 = 4.22k
Ω,R=500Ω,KR
=50
Ω, C = 120pF.
20038537
FIGURE 6.
20038506
FIGURE 7.
20038543
FIGURE 8.
www.national.com
10


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