| 摘要 |
FIELD: radio engineering. ^ SUBSTANCE: from digital initial signal, by means of emphasis, the first signal is generated, which after conversion to bearing frequency, digital-to-analogue conversion and modulation is sent to power amplifier to generate output signal at bearing frequency. To linearise characteristic of power amplifier, emphasis is carried out with control by means of parametres. Test signal is imposed over the first signal, therefore, output signal, together with component of input signal on bearing frequency, additionally comprises component of test signal on bearing frequency. By comparison of test signal component on bearing frequency in output signal with test signal, parametres are formed to control emphasis. Alternatively, it is also possible that test signal is imposed prior to realisation of emphasis. ^ EFFECT: increased accuracy and efficiency of linearisation of power amplifier characteristic. ^ 28 cl, 9 dwg |
