BROADBAND AMPLIFIER BASED ON COMMON BASE (OR COMMON EMITTER) STAGE Russian patent published in 2014 - IPC H03F3/00 

FIELD: radio engineering, communication.

SUBSTANCE: broadband amplifier based on a common base (or common emitter) stage comprises an input stage (1), the control input (2) of which is connected to a signal source (3), a collector load (4) two-terminal element, connected between the power supply (5) bus and the collector output (6) of the input stage (1), a parasitic capacitor (7), connected between the collector output (6) of the input stage (1) and the power supply common bus (8). The circuit includes a non-inverting buffer amplifier (9), the input of which is connected to the collector output (6) of the input stage (1), and the output (10) is the output of the device, and an additional transistor (11), the base of which is connected to an auxiliary voltage source (12), the collector is connected to the input of the non-inverting buffer amplifier (9), the emitter is connected through a current-stabilising two-terminal element (13) to the power supply common bus (8), wherein the output of the device (8) is connected to the emitter of the additional transistor (11) through an additional capacitor (14).

EFFECT: increasing the upper cut-off frequency of the broadband amplifier without deterioration of voltage gain in the operating frequency range.

3 cl, 7 dwg