  We present a design for a wide-bandwidth, voltage-controlled current source
that is easily integrated with radiofrequency magnetic field coils. Our design
uses current feedback to compensate for the frequency-dependent impedance of a
radiofrequency antenna. We are able to deliver peak currents greater than 100
mA over a 300 kHz to 54 MHz frequency span. The radiofrequency current source
fits onto a printed circuit board smaller than $4~\text{cm}^2$ and consumes
less than 1.3 W of power. It is suitable for use in deployable quantum sensors
and nuclear-magnetic-resonance systems.
