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High Speed Amplifiers for Video Applications Part 2 Slide 2

This is a typical example of where it is necessary to convert the video DAC’s current output to a voltage which can then be used to drive a 150 ohm load as you may find in many video amplifier applications. In this case, the video information appears as a voltage to the non-inverting terminal of the Op Amp which is set for a gain of +2 by using RF = RG. Here the Op Amp needs to be a true Single Supply device which by definition includes the ground within its input common mode voltage range and can also swing to ground at the output. Beware that most Op Amps which do allow swing close to ground at the output, do so at moderate loads and even then, can only approach ground to within tens of milli-volts. Here, the 150 ohm output load does not significantly alter the output swing behavior as RLoad is returned to ground and therefore does not draw current at minimum output swing. Examples of suitable TI Op Amps are also shown on this slide.

PTM Published on: 2011-11-21