I have to control an high impedance load (> 25 MΩ) with 12 V pulses with maximum 5 ns of width and a repetition rate of 100 MHz. I can generate the pulses with the required shape using an FPGA but I can only reach 2.2 V. I was thinking of using a fast RF NPN bjt such as the NXP BFU530 or the Infineon BFR92P.
How can I reduce the recover time of the switching without further decreasing R2? (i am already almost at the limit of the IC.)
Or do you have an alternative circuit to suggest?