Trigger_with_adaptive_threshold

Published:2009/7/24 7:33:00 Author:Jessie | From:SeekIC

This circuit triggers from dc to 50 MHz over a 2- to 300-mV input range with no level adjustment. The circuit maintains the A3 output trip-point at one-half the input amplitude, regardless of input magnitude. This ensures reliable automatic triggering over a wide input amplitude range-even for very low-level inputs. As an option, the network shown in dashed lines permits changing the trip threshold. This allows any point on the input waveform edge to be selected as the trigger point. Figure 5-22B shows performance for a 40-MHz input sine wave (Trace A). The A1 output (Trace B) takes gain and the A3 output (Trace C) produces a clean 5-V signal. Linear Technology Corporation, 1991, AN47-59.



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