CERAMIC MEMORY DEVICE,
Abstract
This is the first report describing HDL development on a ceramic peizoelectric memory. The device is in the form of a disc, 1 in. in diameter and 0.025 in. in thickness containing silver electrodes so placed that it operates as a piezoelectric motor-generator at its resonant frequency. Two stable states, permitting binary coding of information, are realized by utilizing the differing outputs resulting from the presence or absence of remnant polarization between the generator electrodes. It was concluded from voltage time experiments that a write-in voltage of about 1500 V dc applied for 3 sec will induce the 'one' condition (ca. 10 V peak-to-peak) and a subsequent write-in voltage of 1500 V dc of reverse polarity for 3 sec will induce the 'zero' condition (ca. 2-3 V peak-to-peak). The device retains the stored information after a period of time in the 'no-power' condition and the readout is non-destructive. The device has isolated read and write electrodes and requires no internal mechanical switching in its connection to the timer circuits for which it will serve as a memory. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1967
- Accession Number
- AD0656598
Entities
People
- C. W. H. Barnett
Organizations
- Harry Diamond Laboratories