707 Leading Edge Discriminator



The Model 707 is a 100 MHz Leading Edge Discriminator specifically designed for experiments with large counter arrays, offering high performance and reliability at a reasonable cost. The 707 features sixteen channels with common threshold and width controls.  By simultaneously generating both Nim and ECL outputs, trigger logic can be simplified.  The Nim output can be used for the fast trigger logic  while the ECL output provides for a TDC input or logic for pattern recognition circuits to produce second level triggers.  In addition, a fast veto input and a Bin Gate are common to all channels.

The 707 has high input sensitivity of -10mV variable to -1Volt via a 15-turn front panel control. A front panel test point provides a DC voltage equal to the actual threshold to insure accurate settings. Likewise, output durations are continuously variable via a front panel control over the range of 5nSec to 150nSec. The 707 employs non-updating regeneration circuits for output widths that are always the same duration regardless of the input rate conditions.

A fast veto input allows simultaneous inhibiting of all channels to reject unwanted events early in the system. Similarly, a bin gate will inhibit the entire module when applied via the rear connector.

The negative Nim output is the current source type which allows for pulse clipping and is protected from damage due to shorted cables.  The differential ECL output is capable of driving two 100 ohm loads or up to 30 daisy-chained ECL inputs.  Output risetimes and falltimes are typically 1.5nSec, and their shapes are unaffected by the loading conditions of the other outputs.

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