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155-0032-00: Difference between revisions
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|Model=M55 | |Model=M55 | ||
|Part_nos=155-0032-00,155-0032-01 | |Part_nos=155-0032-00,155-0032-01 | ||
|Description=variable-gain transconductance amplifier | |Description=variable-gain transconductance (current output with voltage input) amplifier | ||
|Used_in=335;464;465;465B;466;475;475A;475M;634;650;651;652;653;655;656;670;671;7A12;475;FG504;1440;1460;1480;1481;1482;1485 | |Used_in=335;464;465;465B;466;475;475A;475M;634;650;651;652;653;655;656;670;671;7A12;475;FG504;1440;1460;1480;1481;1482;1485 | ||
|Designers=Roy Hayes;Einar Traa | |Designers=Roy Hayes;Einar Traa | ||
}} in a 16-pin DIP | }} in a 16-pin DIP. The [[155-0216-00]] and [[155-0217-00]] (M55D aka M055D) appear to be improved successor versions. | ||
Regarding the 155-0032-xx, [[John Addis]] says, | Regarding the 155-0032-xx, [[John Addis]] says, | ||
<blockquote> | <blockquote> | ||
The 155-0032-00’s IC process had an FT of 1.0 | The 155-0032-00’s IC process had an FT of 1.0 GHz, rather inadequate for the job, but that was all there was at the time. | ||
The on-chip resistors were diffused and thus had too poor a TC and tolerance for use as gain-setting resistors. | The on-chip resistors were diffused (there were no thin film resistors in that process) and thus had too poor a TC and tolerance for use as gain-setting resistors. | ||
As you can see, there are two separate gain | As you can see, there are two separate gain choices determined by which set of emitters is chosen, pins 1 and 16 or 2 and 15. | ||
This selection is made off chip by choosing Q205 or Q215 to carry the current through R212. | This selection is made off chip by choosing Q205 or Q215 to carry the current through R212. | ||
Pot R217 allows dc balance at 5 mV/div to match that at all other sensitivities, controlled elsewhere. | Pot R217 allows dc balance at 5 mV/div to match that at all other sensitivities, controlled elsewhere. | ||
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Pin 12 ultimately selects which pair of the four output cross-connected transistors passes | Pin 12 ultimately selects which pair of the four output cross-connected transistors passes | ||
the signal current from the two transistors whose bases are connected to pin 4. | the signal current from the two transistors whose bases are connected to pin 4. | ||
Which pair of output transistors is chosen determines the polarity of the output signal. | Which pair of output transistors is chosen determines the polarity choice of the output signal (Normal or Invert). | ||
This same pair of transistors also enables variable gain by allowing a controlled amount of cross-coupling of the signal. | This same pair of transistors also enables variable gain by allowing a controlled amount of cross-coupling of the signal. | ||
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The M377 was a single channel plugin on a chip with 0 V common mode input and output voltages, | The M377 was a single channel plugin on a chip with 0 V common mode input and output voltages, | ||
very linear variable gain control, two four pole bandwidth limits, three outputs which could be individually inverted and turned on or off. | |||
The M377 was the first wideband analog IC with dc level shift on chip (allowing 0 V common mode input and output and without PNP transistors), the | |||
first wideband amplifier with any on-chip bandwidth limit selection, first to have more than two fixed gain settings (it has six), | 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 | and first to require only one transient response adjustment (no thermals), and the first to have a highly linear relationship | ||