Constant Current Source of about 300mA with variable frequency ranging from 1kHz to 100kHz

I want to make a constant current source for my project of "Designing of Eddy Current Testing Probe" at my research lab. This constant current source will excite the the coil of Eddy Current Probe and through the excitation of this current source eddy currents will be induced in a material when the probe is placed on that material. For that I need help.
The Constant Current Source should be having following specifications:

1) Output Constant Current = 300 mA

2)Constant Current Source Frequency Range= 1kHz-100kHz

If there anyone to help me?