METHOD OF GENERATING ERROR SIGNALS IN AMPLIFIER CHARACTERISTIC LINEARISATION DEVICES Russian patent published in 2011 - IPC H03F1/32 

FIELD: radio engineering.

SUBSTANCE: method of generating error signals in amplifier characteristic linearisation devices involves an operation for determining the error value from the level of the input and output signal in order to generate error-correcting signals as functions of deviation values. In order to minimise errors due to measuring devices, the level of the input and output signal is measured while generating tabulated correcting signals with an input measuring device while recording into memory buffer the code of the measured level of the input signal and comparing the recorded code of the input signal with the code of the output level measured through a normalised attenuator using the same input measuring device. The value of the correcting voltage is established, which ensures equality of codes of the input and output levels and the code of the established value of the correcting signal is recorded in random-access memory for correcting signals in a cell with an address which corresponds to the code of the level of the input signal. Simultaneously, a second output measuring device measures the level of the output signal of the amplifier and records the code of that level into random-access memory for output levels in a cell with an address which corresponds to the code of the level of the input signal. When generating correcting signals for compensating for current deviations of characteristics from the normal value, the input measuring device measures the level of the input signal. The code of the measured level is assigned the status of the address of cells of random-access memory and over a period of time equal to the lag time of signals on the envelope curve in the amplifier channel, the code of the current level of the output signal measured by the output measuring device and the code of the level of the output signal are simultaneously read form the cell of the random-access memory for output levels with the address-code of the level of the output signal. The levels are compared and deviations are normalised by dividing the difference between read output levels by the level of the output signal read from the random-access memory for output levels, and the current value of the correcting signal is generated from the value of the normalised deviation of the transmission coefficient from the normal value.

EFFECT: method determines operations for determining deviations of amplitude characteristics from linear or deviations of the transmission coefficient of a linearised amplifier from the normal value and from generation of correcting signals which compensate for deviation with minimal errors due to input and output measuring devices.

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