A HIGH PERFORMANCE LOG VIDEO AMPLIFIER,
Abstract
The report describes a logarithmic video amplifier having high sensitivity (0.1 millivolt), wide dynamic range (80 db); good pulse response (0.3 microsecond rise time), and very short recovery time (2 microseconds). Each of these desirable features is readily obtainable by itself, but their simultaneous realization is rare. The secret of success of this design lies in the automatic means of bias stabilization of the logging stage. This permits building a complete amplifier having only one DC blocking capacitor, thus minimizing the recovery time problem. The circuit can handle a wide range of pulse width and duty cycle. Widths between 1/2 microsecond and several hundred microseconds are appropriate at duty cycles to at least 50 per cent. Consideration of the high performance circuit is preceded by a review of approaches to log amplifier design. Finally, a method is shown for improving sensitivity at the expense of recovery time. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1965
- Accession Number
- AD0624295
Entities
People
- Paul E. Harris