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LTC6090 ?
LTC6090 ?
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Old 17th July 2017, 10:42 PM   #1
mchambin is offline mchambin  France
diyAudio Member
Join Date: Mar 2011
Default LTC6090 ?

From the data sheet this high voltage op amp seems very interesting for a op amp based class AB amplifier.
Can I trust the data sheet ?
Can I trust the Spice model ?
Is the LTC6090 Spice Model given by Linear Technologie in LTspice close to reality ?
I am suspicious about the gain phase data. In the data sheet it looks strange to me. From simulation I get a typical gain phase that looks as for a generic general purpose op amp, far from what is given in the data sheet.
Transistor junction temperature is not transistor case temperature.
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Old 18th July 2017, 01:39 AM   #2
Dave Zan is offline Dave Zan  Australia
diyAudio Member
Join Date: Nov 2010
Originally Posted by mchambin View Post
...I am suspicious about the gain phase data. In the data sheet...
It may be unfamiliar to you but the datasheet plot looks like a believable plot for so-called "two pole" (actually two obvious poles plus a zero) compensation.
It has theoretical benefits but is not common in op-amps because it is not as convenient to implement as simple Miller compensation.
The LTC6090 is not a typical op-amp, perhaps the unusual process requirements made it more practical to implement the "two-pole" scheme.

Best wishes
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Old 18th July 2017, 08:35 PM   #3
jcx is offline jcx  United States
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Join Date: Feb 2003
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Default I see remarkable agreement

considering typical Spice op amp macromodeling error
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