A new design criterion for a FET, constant-current, cascode amplifier has been established in this paper. It has been found that if the bias point of the composite device is related to the device parameter in a unique way the criterion referred to above may be obtained. The coil current vector and the branch voltage vector of the amplifier are also found. The detailed expressions for output voltage and drain current have been deduced. © 1975 Taylor & Francis Group, LLC.