Hi
I want excite a inductive-resistive load ( for example 8 uH inductive series with 2 ohm resistive load) by a 1MHz sinusoidal current with a fixed peak between 200 and 300 mA ( for example a sinusoidal current with 250 mA fixed peak ).
I want doesn't vary the peak of excitation current with vary of temperature or something like this. I want have a sinusoidal current excitation without any harmonics and without any variation in peak under every conditions like load Temperature variations . can you represent me an op amp configuration which satisfy my circuit conditions. suppose that the input of this circuit is a 1MHz sinusoidal voltage signal which peak of voltage can be between 1 and 10 volt. for ( for example a 1MHz sinusoidal 1.5 volt pk input signal ). I want implement my circuit by ADA4870 because it is high output current drive (1A) , very high slew rate (2500) , wide output voltage swing (37 volt) and high bandwidth ( more than 52 MHz) ideal for this application.
in application not of ADA4870 no configuration is introduce ! I would like implement an efficient configuration , not a simple configuration like simple v-to-i converter with op amp which attached. because the output current has some harmonics .(I don't know why ! )
i simulate my circuit in multisim .
can some one help me ?
Regards,
sadegh