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Industry: Email Alert RSS FeedLog amp features 50 dB of dynamic range for input frequencies from dc to 120 MHz. (Analog Devices AD640 logarithmic amplifier) (product announcement)
EDN, August, 1989 by Swager, Anne Watson
The AD640 dc-coupled logarithmic amplifier is a monolithic, completely analog device that features a dynamic range of 50 dB, a maximum dc nonlinearity of /-0.6 dB, and a 120-MHz bandwidth. Log amps are useful in such instrumentation applications as spectrum and network analyzers, and they can compress wideband data prior to A/D conversion, thereby reducing the A/D converter's dynamic-range requirements.
The log amp uses a successivedetection scheme to provide an output current proportional to the input voltage's logarithm. You can convert the differential-output current to a voltage by using the device's internal resistors and a highspeed op amp.
The log amp is unique because it integrates five cascaded, dc-coupled, amplifier-limiter stages...
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