Robert C Tucker

US Patent:

42274621, Oct 14, 1980

Filed:

Feb 28, 1975

Appl. No.:

5/553359

Inventors:

Robert W. Tucker - Rockville MD

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

F42C 1100
H03K 522
H03K 1700

US Classification:

102220

Abstract:

A discriminator circuit having utility in proximity fuze firing circuits is apable of distinguishing between spurious and proper signals on the basis of both amplitude and rate of amplitude rise. A firing switch, operated by a slow-charging trigger circuit, and a lock out switch, operated by a fast-charging trigger circuit, are both triggered by the same signal. If the rate of input signal envelope rise is faster than that for a proper firing signal, the lock out switch fires and inhibits triggering of the firing switch. The trigger circuits are biased to permit the firing switch to be triggered before the lock out switch when the input signal rate of rise is slow enough to be followed by the slow-charging trigger circuit. For signal rates of rise which are slower than that associated with a proper signal, a capacitor in the slow-charging trigger circuit becomes charged to block triggering of the firing switch.