Browse Prior Art Database

Matrix Switch

IP.com Disclosure Number: IPCOM000096907D
Original Publication Date: 1962-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Constantine, G: AUTHOR

Abstract

The matrix switch, with input windings 7 and 8 and an output winding 2, has an output tolerance variation no greater than a single input tolerance variation

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Matrix Switch

The matrix switch, with input windings 7 and 8 and an output winding 2, has an output tolerance variation no greater than a single input tolerance variation

Bias windings 6 and 9 have a current continually flowing in them of magnitude effective to saturate the cores 4 and 5 in one sense. The input windings 7 and 8, 10 and 11 at times have currents in them in a sense to produce a magnetomotive force having a polarity opposite to that of the magnetomotive force of the bias winding.

Transistors 12...15 are permanently biased ON. No signal potentials at the terminals 16 are so selected that, in absence of an input signal, transistors
17...20 are likewise biased ON. The potential at junction 21 is, therefore, not much greater than -12 volts. Diodes 22...25 are then reversely biased. The constant currents supplied through the transistors 12...15, therefore, flow through transistors 17...20 and do not flow through input windings 7 and 8, 10 and 11.

If an input signal having a potential sufficiently negative to cut off transistor 17 is received at terminal 16, junction 21 swings positive. Diode 22 becomes forwardly biased and the constant current supplied through transistor 12 passes through diode 22 and winding 8.

Since the magnetomotive forces of the currents in windings 6 and 8 are equal, when an input signal current is received in winding 8 alone, it is sufficient to shift the magnetic state of core 4 from point 26 in the hysteresis loop to point 27. Th...