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I need help on a Howland Effect circuit with a current source purpose with an output of 600mA and a constant gain throughout a range of frequencies starting in 0Hz to 1Mhz. I am currently using an OPA564 with 17 Mhz response but my cutoff frequency is around 87kHz. enter image description here enter image description here Figure 2 represents the Gain and Phase resulting of the circuit shown in figure 1 with the OPA564 Op-Amp with a +/- 6,2 V supply and the current limit flag of 10 kOhm. So my question is how can I improve the performance to get the response with a dropoff only after 1MHz?

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