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EL5100ISZ-T7 Datasheet(PDF) 11 Page - Intersil Corporation |
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EL5100ISZ-T7 Datasheet(HTML) 11 Page - Intersil Corporation |
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11 / 15 page  11 FN7330.3 May 3, 2007 Application Information Video Amplifier with Reduced Size Output Capacitance If you have a video line driver Z = 75 Ω, the DC decoupling capacitor could be relatively large. = f = 10Hz, R = Z = 75 Ω, C = 132µF By using the circuit below, C could be reduced to C2 = 22µF. FIGURE 30. VIDEO- The test result is shown on Figure 30. By selecting a different value for C1, we could reduce the effect, created by C3 R3 and get flat response from 16Hz with an 1/5 value, price and size output capacitor. There is another, very important issue by using high bandwidth amplifiers. In the past when the bandwidth of the operational amplifier ended at a few hundred kHz even at few MHz, the power- supply bypass was not a very critical issue, since a 0.1µF capacitor “did the job”, but today’s amplifiers could have bandwidth, what used to be reserved for microwave circuits not to long time ago. Therefore that high bandwidth amplifiers require the same respect what we reserve for microwave circuits. Particularly the power supply bypass and the pcb-layout could very heavily influence the performance of a modern high bandwidth amplifiers. It could happen above a few MHz, but it will happen above 100MHz, that the capacitor will behave like an inductor. f R 2 1 C × × = π FIGURE 29. 3 2 6 - + U1 EL5104 R1 20K R2 20K R3 10k R4 75 R5 500 R6 500 C2 22µF C3 1.5µF R7 75 C1 C C4 1n C5 22µF R8 3R3 C6 33nF Z = 75 Ω Vs+ -45 -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 1.00E+00 1.00E+01 1.00E+02 1.00E+03 1.00E+04 1.00E+05 1.00E+06 1.00E+07 1.00E+08 1.00E+09 FREQUENCY (Hz) Conditions/comments: (1) C1 = 1µF Vs = +10V (2) C1 = 0.47µF Vs = +10V (3) C1 = 0.47µF Vs = +5V EL5100, EL5101, EL5300 |
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