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Pulse Delay Circuit

IP.com Disclosure Number: IPCOM000089838D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 60K

Publishing Venue

IBM

Related People

Gheewala, TR: AUTHOR

Abstract

Pulse delay circuit 1 and its associated waveforms are shown in Fig. 1. When V(S) and input pulse, I(IN), are applied, interferometer J1 switches to the gap voltage V(g), injecting current into interferometer J2. The time required to switch j2 is given by LI(02) over V(g), which is the delay between the input and the output pulses. The current I(g2) injected into J2 can be used as a monostable output pulse of pulsewidth, tau = LI(o2) over V(g).

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Pulse Delay Circuit

Pulse delay circuit 1 and its associated waveforms are shown in Fig. 1. When V(S) and input pulse, I(IN), are applied, interferometer J1 switches to the gap voltage V(g), injecting current into interferometer J2. The time required to switch j2 is given by LI(02) over V(g), which is the delay between the input and the output pulses. The current I(g2) injected into J2 can be used as a monostable output pulse of pulsewidth, tau = LI(o2) over V(g).

Circuit 1 of Fig. 1 can be easily generalized to produce multiple output pulses with various delays. Josephson junctions or in-line gates can be used in place of interferometers.

The variations in the delay are given by the following equation

(Image Omitted)

where in practice the major contribution is made by the deltaI(o2) over I(o2) term. This term can be reduced to + or - 0.5 by using a 'negative feedback' interferometer 2 with low deltaI(o), as shown in Fig. 2.

The circuit in Fig. 2 is identical to the circuit 1 of Fig. 1 with the exception of interferometer 2. Interferometer 2 is asymmetrically fed with current I(g2) so that the current flowing through inductance 3 thereof produces ag self-induced flux = L(3)I(o2)Sin psi(2). This reduces the threshold current, I(mo), of device 2 to a value less than (I(o1)+ I(o2)). If the value of I(o2) is larger than the design value because of fabrication tolerances, the self-induced flux will also be larger. This larger flux prevents I(mo) from increasing to a n...