M377: Difference between revisions
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About the M377, John Addis says: | About the M377, John Addis says: | ||
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<p>The M377 was a single channel plugin on a chip with | <p>The M377 was a single channel plugin on a chip with 0 V common mode input and output voltages, | ||
excellent variable gain control, two four pole bandwidth limits, | excellent variable gain control, two four pole bandwidth limits, | ||
three outputs which could be separately inverted and turned on or off. | three outputs which could be separately inverted and turned on or off. | ||
</p> | </p> | ||
<p> | <p> | ||
It was the first wideband analog IC with level shift on chip (allowing | It was the first wideband analog IC with level shift on chip (allowing 0 V common mode input and output and | ||
without PNP transistors), first wideband amplifier with any on-chip bandwidth limit selection, | without PNP transistors), first wideband amplifier with any on-chip bandwidth limit selection, | ||
first to have more than two fixed gain settings (it has six), | first to have more than two fixed gain settings (it has six), | ||
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M377 as u310 and u410 in 11a52.jpg|M377 in an [[11A52]], as U310 and U410. Each M377 chip has a differential output impedance of | M377 as u310 and u410 in 11a52.jpg|M377 in an [[11A52]], as U310 and U410. Each M377 chip has a differential output impedance of 200 Ω. The two chips' outputs are in parallel, driving the output pins of the plug-in with a differential impedance of 100 Ω, or 50 Ω per side. | ||
</gallery> | </gallery> | ||
Revision as of 23:35, 15 March 2018
The M377 is a Tek-made amplifier integrated circuit designed by John Addis. It is used in the 11A32, 11A33, 11A34, and 11A52.
About the M377, John Addis says:
The M377 was a single channel plugin on a chip with 0 V common mode input and output voltages, excellent variable gain control, two four pole bandwidth limits, three outputs which could be separately inverted and turned on or off.
It was the first wideband analog IC with level shift on chip (allowing 0 V common mode input and output and without PNP transistors), first wideband amplifier with any on-chip bandwidth limit selection, first to have more than two fixed gain settings (it has six), and first to require only one transient response adjustment (no thermals), and the first to have a highly linear relationship between a control voltage and gain. It also had excellent overdrive recovery.
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M377 in an 11A52, as U310 and U410. Each M377 chip has a differential output impedance of 200 Ω. The two chips' outputs are in parallel, driving the output pins of the plug-in with a differential impedance of 100 Ω, or 50 Ω per side.
