positive emitter coupled logic (PECL) signal/input voltage

in the process of diagnostics for a circuit that feeds a fairchild 9528 16 pin chip. its an oldie #vintage circuit design. there is a 1975 data book giving minimal specifications and no indication of input signal levels, voltages for high low as well as power supply limits.

http://bitsavers.trailing-edge.com/components/fairchild/_dataBooks/1975_Fairchild_Full_Line_Condensed_Catalog.pdf [page 215]

from what is measured and circuit design its a pecl being fed +4.1vdc. circuit involves 100 megahertz region (fm band tuner). output from the tuner gang fets and fet buffer still seem insufficient but not knowing what the 9528 is looking for makes things worse to troubleshoot.

thought, ideas anyone?

by sae-7125
October 15, 2022

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