A pulsed radar transmitter amplifier with rapid turn-off

摘要

A pulsed radar transmitter amplifier with rapid turn-off The close-in sensitivity of a pulsed radar system is improved by driving the drain  supply of the transmitting GaAs transistor 31 with a pull-up NFET 212 that responds  rapidly to a rise in the control signal Pconi. The gate charge of NFET 212 is discharged quickly through NFET 211 when Pconi goes to a high level. The NFET  pull-up device 212 is turned on by charge delivered from bootstrap capacitor 215  when Pconi goes low. The resistor 217C may be bypassed by a transistor (251,  figure 6) to shorten the turn-on time. The gate supply for the GaAs transistor 31 is also pulsed but does not need to provide a rapid response.