Greetings. Please, consider the following circuit (attached).
The source may create current type signal ranging from DC to 400 MHz. It is then filtered by an LC filter which is damped (matched, whatever) by a 50 Ohm resistor. At this point I came up with the idea that I might try to direct the source current not to the ground but to the virtual ground created by LTC6268-10 (https://www.analog.com/media/en/technical-documentation/data-sheets/626810f.pdf) opamp which is used as transimpedance amplifier in this application. The output of the opamp is expected to be of voltage type with relatively small amplitude of about 150mV (hence, the feedback resistor value is relatively small).
The problem is that I have never tried this IRL and do not know if that will work. The questions are:
1) Is it legal to terminate to a virtual ground?
2) Can TIA work with such a low gain?
3) Anything else I've missed? I feel like I don't know what I don't know. Any comments would be appreciated.
The source may create current type signal ranging from DC to 400 MHz. It is then filtered by an LC filter which is damped (matched, whatever) by a 50 Ohm resistor. At this point I came up with the idea that I might try to direct the source current not to the ground but to the virtual ground created by LTC6268-10 (https://www.analog.com/media/en/technical-documentation/data-sheets/626810f.pdf) opamp which is used as transimpedance amplifier in this application. The output of the opamp is expected to be of voltage type with relatively small amplitude of about 150mV (hence, the feedback resistor value is relatively small).
The problem is that I have never tried this IRL and do not know if that will work. The questions are:
1) Is it legal to terminate to a virtual ground?
2) Can TIA work with such a low gain?
3) Anything else I've missed? I feel like I don't know what I don't know. Any comments would be appreciated.
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