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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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HS-1145RH Fiches technique(PDF) 3 Page - Intersil Corporation |
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HS-1145RH Fiches technique(HTML) 3 Page - Intersil Corporation |
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3 / 9 page  3 FN4227.2 February 14, 2005 Driving Capacitive Loads Capacitive loads, such as an A/D input, or an improperly terminated transmission line will degrade the amplifier’s phase margin resulting in frequency response peaking and possible oscillations. In most cases, the oscillation can be avoided by placing a resistor (RS) in series with the output prior to the capacitance. Figure 1 details starting points for the selection of this resistor. The points on the curve indicate the RS and CL combinations for the optimum bandwidth, stability, and settling time, but experimental fine tuning is recommended. Picking a point above or to the right of the curve yields an overdamped response, while points below or left of the curve indicate areas of underdamped performance. RS and CL form a low pass network at the output, thus limiting system bandwidth well below the amplifier bandwidth of 270MHz (for AV = +1). By decreasing RS as CL increases (as illustrated in the curves), the maximum bandwidth is obtained without sacrificing stability. In spite of this, the bandwidth decreases as the load capacitance increases. For example, at AV = +1, RS = 62Ω, CL = 40pF, the overall bandwidth is limited to 180MHz, and bandwidth drops to 75MHz at AV = +1, RS = 8Ω, CL = 400pF. Evaluation Board The performance of the HS-1145RH may be evaluated using the HFA11XX Evaluation Board. The layout and schematic of the board are shown in Figure 2. The VH connection may be used to exercise the DISABLE pin, but note that this connection has no 50Ω termination. To order evaluation boards (part number HFA11XXEVAL), please contact your local sales office. 0 100 200 300 400 0 10 20 30 40 50 LOAD CAPACITANCE (pF) AV = +1 150 250 350 50 FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs LOAD CAPACITANCE AV = +2 FIGURE 2A. TOP LAYOUT FIGURE 2B. BOTTOM LAYOUT FIGURE 2C. SCHEMATIC FIGURE 2. EVALUATION BOARD SCHEMATIC AND LAYOUT VH +IN VL V+ GND 1 V- OUT 1 2 3 4 8 7 6 5 +5V 10 µF 0.1 µF VH 50 Ω GND GND R1 -5V 0.1 µF 10 µF 50 Ω IN OUT VL 510 510 HS-1145RH |
Numéro de pièce similaire - HS-1145RH_05 |
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Description similaire - HS-1145RH_05 |
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