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Prediction of inter-modulation rejection values for the first and second adjacent channels in feed-forward linearised microwave amplifiers using closed-form expressions

Prediction of inter-modulation rejection values for the first and second adjacent channels in feed-forward linearised microwave amplifiers using closed-form expressions

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Feed-forward is one of the main methods for linearising microwave power amplifiers. The level of inter-modulation rejection (IMR) values can be predicted by appropriate modelling of the feed-forward microwave amplifier. Here, we have presented closed form expressions, which can be used for predicting the IMR for the first and second adjacent channels. Fifth- and third-order nonlinear models have been used for the main and error amplifiers, respectively. The predicted values have been verified using ADS simulator and a MATLAB program.

Inspec keywords: feedforward amplifiers; intermodulation distortion; microwave power amplifiers

Other keywords: feed-forward linearised microwave amplifiers; feed-forward microwave amplifier; second adjacent channel; microwave power amplifiers; inter-modulation rejection values; IMR; fifth-order nonlinear models; third-order nonlinear models; first adjacent channel; closed-form expressions

Subjects: Amplifiers

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