access icon free Technique to characterise transient behavioural of multistage RF power amplifier for two-way radio applications

A new technique to characterise the behavioral response of multistage RF power amplifier (PA) is presented. A simplified design methodology of closed loop PA with DC current sensing of multistage PA (cascaded) and voltage shaping algorithm is introduced in this study. An accurate characterisation of transient behavioral which includes ramping of RF energy from noise level to steady state level and adjacent channel transient power (ACTP), shows a high degree of correlation with measurement level for wideband RF PA operation (400–520 MHz). A prototype board is fabricated and measurement results demonstrated good correlation with transient behavioral model simulation. On board measurements demonstrated transient timing response of 1 ms while maintaining good ACTP of less than -60 dB over the wide frequency range of 400–520 MHz.

Inspec keywords: wideband amplifiers; transient analysis; closed loop systems; timing; circuit simulation; UHF power amplifiers; electric sensing devices

Other keywords: behavioral response; wideband RF PA operation; DC current sensing; transient behavioral model simulation; correlation; closed loop PA; transient timing response; frequency 400 MHz to 520 MHz; transient behavioural characterisation; two-way radio applications; RF energy ramping; cascaded algorithm; simplified design methodology; ACTP; multistage RF power amplifier; adjacent channel transient power; voltage shaping algorithm; multistage RF PA

Subjects: Analogue circuit design, modelling and testing; Amplifiers; Microwave circuits and devices

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