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Bi Polar Discriminator with Uni Polar Output

IP.com Disclosure Number: IPCOM000090054D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Millham, EH: AUTHOR [+2]

Abstract

This circuit enables time delay testing to be performed. A threshold circuit furnishes an output pulse of the same polarity regardless of whether the input signal traverses the threshold level in either a positive or negative direction.

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Bi Polar Discriminator with Uni Polar Output

This circuit enables time delay testing to be performed. A threshold circuit furnishes an output pulse of the same polarity regardless of whether the input signal traverses the threshold level in either a positive or negative direction.

An input signal to the base of transistor T1 in A, which swings about the reference voltage on the base of transistor T2, causes conduction to switch between T1 and T2. Since T1 and T2 are high-speed devices, conduction changes at a rate faster than the input signal. The rapid change of conduction or current to the collectors of T1 and T2 causes a voltage to be induced in the secondary of transformers TR1 and TR2. The inductance of the windings of transferred T1 and T2 is selected to provide one output when the input voltage changes at a rate greater than 1 volt per 100 nanoseconds. As the two collectors are 180 degrees out-of-phase, the induced voltages are also 180 degrees out-of- phase. One of these voltages goes positive and is propagated to the output of the plus Or module. The negative voltage is not propagated. A positive signal on the base of T1 causes a positive voltage to be applied to pin 1 of module 4. A negative signal on the base of T1 causes a positive voltage to be applied to pin 2 of module 4. In either case, a positive output pulse is available at the output of pin 3 of the module regardless of the direction of the applied pulse.

In B, waveforms for the circuit indicat...