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September 19, 1966 Electronics
 [Table of Contents]
Wax nostalgic about and learn from the history of early electronics.
See articles from Electronics,
published 1930 - 1988. All copyrights hereby acknowledged.
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Integrated circuits were
just entering the mainstream of electronics in 1966 when this two-page Motorola
spread appeared to promote some new monolithic IC amplifier products. Monolithic
means everything is contained on a single substrate (silicon die), as opposed to
a hybrid circuit with an IC die and one or more discrete components contained
inside a can. You'd have to be an old guy (like me) to realize that High-Speed Core Memory Sense Amplifier
refers to one of four wires (x-axis, y-axis, sense, inhibit) that were threaded
through
magnetic core (toroid) memories in use before monolithic memory was
available. As reported in this same issue, computer-aided design (CAD) played a
huge part in enabling the efficient and profitable manufacturing of integrated
circuits. The public - consumer, commercial, and military/aerospace - was in the
process of adopting this amazing new technology... with a bit of dubiousness.
Motorola Monolithic IC Amplifiers
 Motorola Announces Three New State-of-the-Art
Monolithic Integrated Amplifiers
High-Speed Core Memory Sense Amplifier
TYPE MC1540
... with adjustable threshold voltage!
Typical performance:
• Fast recovery time — tr = 40 ns compatible with 0.5 microsecond cycle time
memories
• Saturated logic output signal • Narrow uncertainty region — 6 mV
• High sensitivity — h = 17 mV (adjustable)
... for all applications requiring core memory signal sensing — such as, industrial
control systems, data processors, and airborne computer systems.
Guaranteed Low-Noise FET for VHF Amplifiers and Mixers
Now, RF receivers, including high-quality FM sets, can be virtually free from
spurious responses, if you specify Motorola's new 2N3823 state-of-the-art JFET.
An extremely low 100-MHz noise figure of 2.5 dB (max) is complemented by low cross-modulation
and intermodulation distortion.
General Purpose JFETs Offer Low-Noise & Low-Cost for Industrial &
Consumer Uses
Tone Control for High-fidelity Audio Amplifiers
Ease of converting audio preamplifiers to FET designs with Motorola types 2N4220A-22A
has excited the imaginations of engineers. The high input-resistance allows for
"vacuum-tube" design principles in selection of tone control elements — permitting
use of small, low-cost capacitors. The low guaranteed noise figure of 2.5 dB ( max)
at 100 cycles/sec. provides a definite advantage over bipolar transistors. For additional
savings, the cost is only $2.90 (100-up), even lower in larger production quantities.
N-Channel IGFET Offers High Gain for General Purpose Applications
Motorola's new MFE3001 IGFET operates in both the enhancement and depletion modes,
for a broad range of applications in industrial, military, and consumer equipment.
And, the 100-up price of $3.90 makes it practical for most applications. Typical
uses are audio amplifiers, switches and controls. A low drain current results from
its small geometry, and the n-Channel construction provides high gain indicated
by the 'y specification of 1,800 mhos (typ).
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