METHOD OF LINEARISING AMPLITUDE CHARACTERISTICS OF RADIO SIGNAL AMPLIFICATION PATH Russian patent published in 2011 - IPC H03F1/26 H03G3/20 

FIELD: physics.

SUBSTANCE: method of linearising amplitude characteristics of the amplification path of a radio signal formed by amplification characteristics of two parallel amplifiers, characterised by that the nominal value of the transmission coefficient of the amplification path is formed as a transfer function of two amplifiers which are connected in parallel on inputs and outputs and separately controlled on two sections of the amplitude characteristic. At the initial low-signal section of the amplitude characteristic, the common modulo transmission coefficient is formed as a sum of transmission coefficients of the non-controlled main amplifier and an auxiliary controlled parallel amplifier, and on the remaining section up to the maximum input level by adjusting the transmission coefficient of the main amplifier for the transmission coefficient of the auxiliary parallel amplifier equal to zero during the off mode on the current of output transistors thereof, and compensation for phase deviations is performed on the an input signal which is common for both amplifiers. The method is based on that, the transfer function of the two parallel-connected directed links (amplifiers) is equal to the sum of transfer functions of the directed links. Directivity is absence of cross-talk between the links and absence of effect of the overall output signal on characteristics of the parallel-connected links. In the disclosed method, directivity is provided by limiting the active region of the operation mode of the auxiliary amplifier on gain and on operation mode, on the direct current of the final stage of the auxiliary amplifier.

EFFECT: high linearisation of the amplification path in a wide frequency range.

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