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High Speed Amplifiers for Video Applications Part 2 Slide 3

There are many applications which are not as simple as the one I just showed you. Let’s run through a sample application with the requirements listed on the left-hand side in order to clarify some of the considerations which go into selecting and applying a high-speed video amplifier. Using a high-performance Op Amp to amplify an analog video signal requires some attention to detail. Apart from the obvious such as making sure the amp has enough bandwidth, can support the output load and supply voltage, etc., the input and output voltage ranges should be considered. Here are some details which go into designing a single section to buffer a video signal which would then be presented to a standard back-terminated load. For example, to preserve the video amplitude at the load which is driven by the amplifier, you would need to set the circuit gain to +2 such that at the load, you would get the original one volt peak-to-peak signal back. That is because of the six db loss penalty due to the presence of Rout in this circuit. The 75 ohm output resistor is a fairly standard method of driving a 75 ohm cable terminated in a 75 ohm load and is intended to minimized reflections at higher frequencies that could lead to signal distortion.

PTM Published on: 2011-11-21