A wide bandwidth voltage-follower with low distortion and high slew rate

A symmetrical BJT voltage-follower is presented which combines low harmonic distortion and high slew rate. Unlike conventional class-AB voltage-followers the proposed design provides large signal swing, some plusmn4.5 V on a plusmn5 V power supply, as well as large positive and negative output currents for driving capacitive loads, resulting in high slew-rate capability. The circuit exhibits gain flatness of 0.1 dB at 728 MHz with an inductive behaviour coming in at higher frequencies. The operational range is -20degC to +100degC with a power consumption of 55 mW at room temperature.