--- In LTspice@..., "afhockey623" <jxm1092@...> wrote:
--- In LTspice@..., "Helmut" <helmutsennewald@> wrote:
--- In LTspice@..., "afhockey623" <jxm1092@> wrote:
--- In LTspice@..., "sawreyrw" <sawreyrw@> wrote:
--- In LTspice@..., "afhockey623" <jxm1092@> wrote:
Is this an error? I just started using LTspice and I'm trying to use a circuit with an LT1210 and it shows two + supply inputs instead of the usual + and - supply inputs. Thanks gentlemen.
Hello,
Yes, the lower + terminal should be marked -. The models "test circuit" show a negative supply connected to that pin.
Rick
With the circuit I have though no matter how I position the power supplies I am not getting the expected output so I'm not sure if this part is broken or if I need to position them a certain way and that there is actually errors in my circuit.
Hello,
Maybe something else is setup wrongly fro LTspice.
If you upload your circuit, we might help you.
Best regards,
Helmut
Hi,
I was able to figure it out by opening up the test fixture for the op-amp. Do you know why the put an 11 Ohm resistor on the output of the opamp?
Hello,
The original circuit is on page 1 in the datasheet.
It has a 1:3 transformer driving a 100Ohm transmission line. We
have then an input impedance of 100/3^2=11Ohm on the primary side.
Using a 11Ohm series resistance is a perfect match of this
impedance.
Maybe they removed this transformer in the jigs-example to allow
to simulate the response down to DC.
Best regards,
Helmut
