Flashback > 10 Years Ago
MARCH 5, 1992
A gallium-arsenide-based transistor structure possessing a maximum cutoff or transition frequency (ft) of more than 118 GHz is close to fruition. The research, done by the laboratories of GEC-Marconi Materials Technology Ltd., Caswell, England, is part of a quest for higher-frequency analog and faster digital logic devices for use in radio communications, fiber-optic transmission systems, and radar signal processing....
More important than the 118-GHz ft figure is that the HBTs \[heterojunction bipolar transistors\] are useful for both analog and digital circuits. Consequently, mixed-signal microwave ICs will be able to operate directly on millimeter-wavelength radio signals, while simultaneously processing data at around 45-GHz clock speeds. (Technology Advances, p. 33)
Flashback > 25 Years Ago
MARCH 1, 1977
Is a DMM with 4-1/2 digits inherently more accurate than one with 3-1/2 digits? Contrary to popular opinion, the answer is "Yes"—at least for meters with sensing accuracies in the order of 0.1% of the reading, or better.
Practically speaking, inaccuracy in a DMM reading is the total ambiguity of the displayed value. A series of terms compose it: the basic front-end sensing accuracy of the meter (through the converter), temperature coefficient, drift with time, short-term stability, and resolution. Usually, the nominal accuracy quoted for a meter is its sensing accuracy. (Technology, p. 72)
Flashback > 40 Years Ago
MARCH 1, 1962
Produced by vacuum deposition of NiFe alloy onto a heated glass substrate, these ferromagnetic thin-film plates make up high-density memory planes. The substrates used in the BIP-1001 have a density of about 150 bits/in.2 This represents about a ten-fold increase compared to previously available units.
Manufactured by Burroughs Corp., Electronic Components Div., Plainfield, N.J., the planes are reported to offer a cost per bit reduction of 50% over present planes.
Each substrate has a storage capacity of 32 words, 24 bits. A complete memory plane uses four substrates and has a 128-word, 24-bit total, or a yield of 3,072 bits.... The high-density memory planes are available immediately for $1500. (Product Features, p. 94)
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