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LTC6090 ?
LTC6090 ?
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Old 17th July 2017, 10:42 PM   #1
mchambin is offline mchambin  France
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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.
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Old 18th July 2017, 01:39 AM   #2
Dave Zan is offline Dave Zan  Australia
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Quote:
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
David
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Old 18th July 2017, 08:35 PM   #3
jcx is offline jcx  United States
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Default I see remarkable agreement

considering typical Spice op amp macromodeling error
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