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EL2090CM Datasheet(PDF) 9 Page - Elantec Semiconductor |
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EL2090CM Datasheet(HTML) 9 Page - Elantec Semiconductor |
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9 / 12 page  EL2090C 100 MHz DC-Restored Video Amplifier Applications Information Contd a saturation voltage we prevent this node from approaching the positive rail The maximum voltage is set by the resistive voltage divider (be- tween Va and GND) R1 and R2 plus a diode This value can be adjusted if the maximum size of the input signal is known The diode used is an off-the-shelf 1N914 or 1N916 As is true of all 100 MHz amplifiers good by- passing of the supplies to ground is mandatory 1 mF tantalums are sufficient and 001 mF leaded chip capacitors in parallel with medium value electrolytics are also good Leads longer than can induce a characteristic 150 MHz resonance and ringing The VINb of the video amplifier should have the absolute minimum of parasitic capacitance Stray capacitance of more than 3 pF will cause peaking and compromise the gain flatness The band- width of the amplifier is fundamentally set by the value of Rf As demonstrated by the frequen- cy response versus gain graph the peaking and bandwidth is a weak function of gain The EL2090 was designed for Rf e 300 X giving opti- mum gain flatness at Av ea2 Unity-gain re- sponse is flattest for Rf e 360 X gains of a5 can use Rf e 270 X In situations where the peaking is accentuated by load capacitance or binput ca- pacitance the value of Rf will have to be in- creased and some bandwidth will be sacrificed The VINa of the video amplifier should not look into an inductive source impedance If the source is physically remote and a terminated input line is not provided it may be necessary to connect an input ‘‘snubber’’ to ground A snubber is a re- sistor in series with a capacitor which de-Q’s the input resonance Typical values are 100 X and 30 pF The output of the video amplifier is sensitive to capacitive loads greater than 25 pF and a snub- ber to ground or a resistor in series with the out- put is useful to isolate reactive loads 9 |
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