Analog predistortion based linear power amplification circuit and method
A technology of linear power and amplifying circuits, which is applied in the field of linear power amplifying circuits and linear power amplifying. It can solve the problems of output vector signal amplitude and phase deviation, adjacent channel signal interference, and amplitude distortion, so as to improve linearity and occupy PCB area. The effect of small size and wide working bandwidth
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[0024] The linear power amplification circuit based on analog predistortion of the present invention is as figure 2 As shown, it includes sequentially connected: pre-amplifier U1, first temperature-controlled attenuator U2, analog predistorter, second temperature-controlled attenuator U3, push-pull amplifier U4, and final high-power amplifier U5. The push-pull amplifier U4 and the final high-power amplifier U5 use LDMOS (Laterally Diffused Metal Oxide Semiconductor).
[0025]First, the RF input signal is adjusted by the pre-amplifier U1 to meet the input power requirements of the analog predistorter; then the adjusted signal enters the first temperature-controlled attenuator U2 to compensate for the change in the operating point of the analog predistorter when the temperature changes. Drift; the compensated signal passes through the analog predistorter to output the RF output signal with the predistortion signal; the signal passes through the second temperature-controlled att...
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