I'm trying to simulate the ADL5536 Gain Block in LTspice. A link to the datasheet can be shown below:
http://www.analog.com/media/en/technical-documentation/data-sheets/ADL5536.pdf
Analog Devices doesn't have a SPICE model for it, only the S-model parameters, but I think I found a rough workaround, and I wanted to ask here whether it was feasible or not.
The gain was presented as roughly 20.1 dB, round it to 20 dB, and I was thinking of using an ideal op-amp to simulate the gain ideally as shown below:
simulate this circuit – Schematic created using CircuitLab
For a rough gain estimate, assuming same impedances, modeling it as an ideal non-inverting op-amp should lead to the 20 dB gain based on calculating the voltage gain in decibels. Does this seem correct based on my understanding, or am I missing something?
Best Answer
The opamp model in lt spice is an ideal model which has the following properties:
which you have to be careful because the op amp can source infinite amounts of current or voltage. The model also has 1 pole 'filter' on the output to limit the bandwidth, and open loop gain.
These can be set by changing the Aol (open loop gain) parameter and GBW (bandwidth) parameter.