INPUT_BUFFER_FOR_100_MHz_COUNTER

Published:2009/7/6 2:31:00 Author:May | From:SeekIC

Can be used with 500-ohm probe for wide range of high-frequency input signal levels and waveforms, as part of frequency counter using standard emitter-coupled logic. Opamps used have 50-ohm input impedance. 450-ohm resistor in series with coax gives 10:1 attenuation factor (80 mV at amplifier input when measuring 800-mV ECL swing).-W. R. Blood, Jr., Measure Frequency and Propagation Delay with High Speed MECL Circuits, Motorola, Phoenix, AZ, 1972, AN-586, p 3.



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