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LMH6628MAX データシート(PDF) 10 Page - National Semiconductor (TI) |
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LMH6628MAX データシート(HTML) 10 Page - National Semiconductor (TI) |
10 / 11 page 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 |
同様の部品番号 - LMH6628MAX |
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同様の説明 - LMH6628MAX |
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