High bandwidth current mode amplifier for envelope modulated RF amplifiers

High bandwidth current mode amplifier for envelope modulated RF amplifiers

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A high bandwidth discrete current mode amplifier capable of driving large voltages into low impedances is presented. A differential current mirror output stage ensures stability at high frequencies. Small signal bandwidth is 24 MHz and large signal bandwidth extends into the megahertz region. When amplifying the AC component of a 3 MHz 3rd generation partnership project (3GPP) long term evolution (LTE) envelope signal, an efficiency of 19.1% is achieved at 18.8 V peak-to-peak output across a 15 Ω load.


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