A High Bandwidth Class G Current-Mode Amplifier for Envelope Modulators

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  • Author: G.T. Watkins
A high efficiency wideband discrete current-mode class G amplifier is described. It can produce a high power wideband signal with a high degree of efficiency. When used in a frequency split envelope modulator, class G is particularly suitable for applications involving high peak-to-averagepower ratio (PAPR) signals, like that of orthogonal frequency division multiplexing (OFDM). An efficiency of 39% at 3.3W output power into 33Ω can be achieved when amplifying the AC component of a 3MHz bandwidth 3GPP Long Term Evolution (LTE) envelope signal.