BROADBAND HARMONIC AMPLIFIER Russian patent published in 2023 - IPC H03F3/26 

FIELD: radio engineering.

SUBSTANCE: broadband power amplifiers. The broadband power amplifier, made in the form of a push-pull power amplifier on bipolar transistors with a common emitter on transformers with magnetic coupling between the windings, additionally contains in each arm of the push-pull amplifier a limiting diode D_l, a source of constant cutoff voltage E_c and a blocking capacitor C_bl. The limiting diode D_l is connected directly in front of the decoupling capacitor C_d at the input of the transistor-amplifier in such a way that its conductivity is directed towards the source of constant cutoff voltage E_c, which is connected in series with the limiting diode and the negative terminal of which is grounded. In parallel with the source of constant voltage cutoff the blocking capacitor C_bl is included. The capacity of the blocking capacitor of the E_c source is selected from the condition 1/2πf_n⋅C_bl<<R_c, where f_n is the lower frequency of the operating range, R_c is the internal resistance of the DC cutoff voltage source E_c.

EFFECT: reduction of the level of spurious radiation at the harmonics of the carrier frequency at the output of broadband amplifiers.

1 cl, 3 dwg