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Pulse Width Discriminator

IP.com Disclosure Number: IPCOM000097412D
Original Publication Date: 1962-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Scherr, AL: AUTHOR

Abstract

The circuit passes pulses having a width less than Dn+T and greater than Dn-T. A pair of inertial delay units 1 and 2 are connected in a two-channel circuit arrangement for accomplishing the discrimination. An inertial delay unit passes pulses greater than the magnitude of its delay.

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Pulse Width Discriminator

The circuit passes pulses having a width less than Dn+T and greater than Dn-T. A pair of inertial delay units 1 and 2 are connected in a two-channel circuit arrangement for accomplishing the discrimination. An inertial delay unit passes pulses greater than the magnitude of its delay.

Unit 1 determines the minimum width of a passed pulse and is connected to delay device 3. Device 3 has a delay of twice the discriminator tolerance. Its output is coupled as one input to And 5.

Unit 2 is included in the second channel for determining the maximum width of a passed pulse. The output of this unit is inverted at 4 and coupled as the second input to And 5.

When a pulse having a width in the range Dn+T (for example Dn) is supplied at input A, it is applied to each of the units 1 and 2. Unit 1 delays the pulse provided at B by an amount equal to Dn-T. Device 3 further delays the pulse by 2T to provide the pulse at C as one input to circuit 5.

Unit 2 does not respond to the pulse at A to provide D, since it does not pass a pulse shorter than Dn+T. The down level output at D is inverted at E to serve as the second input to circuit 5. Coincidence of up level pulses occurs in circuit 5 to provide the pulse Dn at the output F of the discriminator.

If the input pulse is below the minimum pulse width of the discriminator (<Dn- T), the circuit does not pass any pulse. This is because neither of units 1 and 2 pass a pulse shorter than the magnitude of its d...