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Minority Carrier Storage Core Transfer

IP.com Disclosure Number: IPCOM000098936D
Original Publication Date: 1958-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Fleisher, H: AUTHOR

Abstract

In this core transfer circuit (top figure) a semiconductor diode hole storage amplifier replaces the conventional diode-capacitor transfer circuit. The circuit requires a pulse to drive the storage diode into its cutoff region. This must be properly timed to occur directly after the shift pulse (middle figure).

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Minority Carrier Storage Core Transfer

In this core transfer circuit (top figure) a semiconductor diode hole storage amplifier replaces the conventional diode-capacitor transfer circuit. The circuit requires a pulse to drive the storage diode into its cutoff region. This must be properly timed to occur directly after the shift pulse (middle figure).

Such timing is not only necessary for the operation of the semiconductor diode amplifier in order to make full use of the hole storage effect, but is also required to ensure that the core to which transfer is to be made is not under the influence of the shift winding. If the two occurred simultaneously, the shift winding would take precedence and transfer could not take place.

For certain cores, a transfer time of the order of 10 usec. is desirable and it is possible to choose a semiconductor diode with a hole storage effect of this order of magnitude. The GE IN92, a diffused junction diode, is an example of a diode with a hole storage duration of this order.

The lower figure shows the timing diagram of the semiconductor amplifier.

The requirement of the input diode is that it have very little hole storage effect, but be characterized by a good front to back resistance ratio.

In the operation of the circuit, the shift pulse provides the forward current for the minority carrier storage diode. The storage diode drive pulse, which comes on immediately after the shift pulse, then releases the carriers which provide the cu...