Don't miss an in-depth article recently added to our site: Selecting video op ampsWritten by By Barry Harvey, of Intersil Semiconductor, it covers the use of video amps and their various characteristics, and amplifier topologies.
He begins:
Video op amps have improved significantly since their debut in the early 1990s. The first versions operated from ±15V supplies, featured bandwidths of 50 MHz, and delivered slew rates in the low hundreds of volts per microsecond. Today's fastest amplifiers run on ±5V supplies with bandwidths of 1.4 GHz and slew rates of 6000V/µsec. There are hundreds of versions available, and, to add to the challenge, many applications require the lowest possible supply voltage.
To simplify the design choices, it's important to identify major parameters of interest. Start with the kind of signal the op amp is passing, the available supply voltages, and the power dissipation that an application allows or tolerates. Important intangibles include ease of use and tolerance to board layout. This article covers the signal requirements and then reviews available amplifier topologies. Table 1 suggests amplifiers for different signals.Pictured (Figure 3): The average level of video signals varies between dark and fully white.
Note we have added this to our roundup of technical 'How to' guides. Make sure you bookmark: http://www.electronicsweekly.com/howto
This is a selection of in-depth, engineer-oriented content that guides you through such areas as:
- calculating power in FPGA design
- selecting the right white LED driver
- choosing the right analogue switch
- optimising mobile power efficiency
- testing high-power LEDs
- verifying power-cycled SoCs for checking and coverage
- specifying a connector for power rating
- choosing the right power supply
- succeeding with ultra-small QFN packages
- reading a semiconductor data sheet
- selecting video op amps
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