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Generating Low Skew Overlapping Pulses

IP.com Disclosure Number: IPCOM000094573D
Original Publication Date: 1965-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Tocher, DA: AUTHOR

Abstract

In some applications, two pulses that are separated in time should be made to overlap by a selected interval. In this circuit, such an overlap is established by the length of a delay line and is independent of other delays in the circuit.

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Generating Low Skew Overlapping Pulses

In some applications, two pulses that are separated in time should be made to overlap by a selected interval. In this circuit, such an overlap is established by the length of a delay line and is independent of other delays in the circuit.

The circuit includes two drivers A and B that receive the two pulses and cooperate with the delay line to produce the overlapping output pulses. The two input pulses can be derived from the same source by using a second delay line, not shown. The delay line and the two drivers perform a logic function such that the output pulses are formed in the interval between the two input pulses. First consider how the drivers operate in the case in which the line has zero delay.

The two devices and the line form an Or Invert logic function. Thus, when either input is up, the line is down and, when both inputs are down, the line is up. Thus, without delay the line is up to form a pulse in the interval between the trailing edge of the first input pulse A and the leading edge of the second input pulse B. An extraneous pulse is produced in the interval between the trailing edge of input pulse B and the leading edge of the next pulse at the A input. Such pulse is gated out by circuitry connected to the outputs, not shown. Thus, driver A produces the leading edge of both output pulses and driver B produces the trailing edge of both output pulses. The time relationship between the two leading edges and betwe...