Hello;
In aplication note 159;
https://www.analog.com/media/en/tech...es/an159fa.pdf
You made 2 different version of the amplifier single ended input (page 4) and differential input (page 14), I do not understand how you connect single ended output LT3045 (DUT) device to differential input amplifier as shown on page 15. Could you please explain it?
...also answering the questions below. Thanks for the post. I show two images below of the same hand-made fitting that mechanically converts a single-ended BNC to a differential BNC connection.
The LT1818s and LT6232s in the amplifier circuit you reference have an abs. max. rating of 12.6V according to their datasheets V+ to V-, so that is a good voltage to avoid. The amplifier specifies a +/-4.5V supply but a little higher voltage will work as well. I believe the LT1818 and LT6232 are characterized at +/-5V. You probably lose headroom if the amplifier supply is too low.
I show in another image below that the 1k pot you mention adjusts the gain of one of the stages from 15 to 25. AN159 talks about calibration, but essentially you just drive the input of the amplifier with a signal generator and a 1000 to 1 Ohm resistor divider in a low-noise environment and make sure the total amplifier gain is what you want in the passband. The corner frequencies should not require adjustment but you can verify that as well.
...also answering the questions below. Thanks for the post. I show two images below of the same hand-made fitting that mechanically converts a single-ended BNC to a differential BNC connection.
The LT1818s and LT6232s in the amplifier circuit you reference have an abs. max. rating of 12.6V according to their datasheets V+ to V-, so that is a good voltage to avoid. The amplifier specifies a +/-4.5V supply but a little higher voltage will work as well. I believe the LT1818 and LT6232 are characterized at +/-5V. You probably lose headroom if the amplifier supply is too low.
I show in another image below that the 1k pot you mention adjusts the gain of one of the stages from 15 to 25. AN159 talks about calibration, but essentially you just drive the input of the amplifier with a signal generator and a 1000 to 1 Ohm resistor divider in a low-noise environment and make sure the total amplifier gain is what you want in the passband. The corner frequencies should not require adjustment but you can verify that as well.
