A MEMORY UNIT WITH NONDESTRUCTIVE READOUT,
Abstract
A nondestructive-read storage device was developed which has a capacity of 16 20-digit words and is designed with 0.9 VT toroidal cores. The information is readout by field pulses whose strength is lower than the threshold field of the cores. Hence, only reversible polarity changes take place. Such storage requires highly stable sensing current pulses and is not critical to the number of readouts. The current amplitude is only about 30 percent of that conventionally used in storages with 'elastic' read. The storage element is designed with two cores which improves the 1-signal to O-signal ratio and stabilizes the load of current shapers. Output 1 and 0 signals are of different polarities. The amplifier input is disabled for 3 mu sec during the write cycle, in order to preclude saturation of the transistor by discharge surge. Pulse-controlled diode decoders are used in the first and second stages of address decoding. An experimental hookup developed along the above lines had these characteristics: write frequency, 300 kHz; read frequency, 2 MHz; minimal output, 5 mv; time of operation, 30-50 percent that of conventional ferrite storage. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 17, 1970
- Accession Number
- AD0705745
Entities
People
- F. N. Zykov
- M. S. Sych
- V. M. Korsunskii
Organizations
- National Air and Space Intelligence Center