Gain Stable Mixers and Amplifiers with Current Feedback

Narrow-band radio-frequency amplifiers and mixers may be stabilized by negative feedback without increasing the bandwidth excessively. A couple using current feedback is described. This couple requires only a simple resistive beta circuit and may be designed such that the band-pass characteristic is largely independent of the feedback. Consideration is given to the problem of input impedance and a design procedure is outlined. A discussion of the experimental results concludes the paper.