Crossmodulation in transistorized TV tuners

This paper describes crossmodulation in transistorized television tuners and develops an analytical method for predicting the crossmodulation of transistors over a wide range of operating biases and frequencies. The paper also evaluates crossmodulation interference in the mixer stage as well as in the rf stage of television tuners under adjacent-channel conditions. Various methods for the reduction of crossmodulation are reviewed. A transistor television tuner modified in accordance with the technique developed in the paper is shown to be substantially improved in crossmodulation performance.