1010 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1956 



Fig. 20 — Ferroelectric array. 



access speeds must be comparable in speed if they are not to become the 

 speed bottleneck. All portions of the system must be in balance time- 

 wise. 



Devices and techniques for use in the design of high speed logic cir- 

 cuits are available. ^^ With such devices information processing pre- 

 viously carried out by complex relay circuitry may be carried out in 

 microseconds instead of milliseconds. Devices such as semiconductor 

 diodes and transistors seem to be pointing the way to the future in per- 

 forming these functions.2^ Previously, hot cathode tubes with high 

 power consumption were needed to achieve the same functions at simi- 

 lar high speeds and for a long time this has been one of the greatest 

 deterrents to electronic switching. 



Semiconductor diode gate circuits are now quite familiar^* and take 



