Design and Simulation of a New RF Predistortion Circuit

According to the predistortion theory and cancellation method,an improved program of predistortion circuit is put forward,which includes the third-order and the fifth-order intermodulation-component′s predistortion circuit.Finally,take the power amplifier device of Polyfet company′s memory effect as an example,analyzing and comparing the power′s performance between unpredistortion circuit and predistortion circuit,which tests the improvement level of distortion′s component.The third-order intermodulation-supression is improved 20.5 dB.Meanwhile,the fifth-order intermodulation-supression is improved 3.8 dB.The third-order intermodulation-supression is improved 3.2 dB than conventional scheme.the fifth-order intermodulation-supression is improved 5.8 dB than conventional scheme.