Перевод названия: Method of compensation of distortions of signals with angle modulation in digital synthesizers of signals
Тип публикации: статья из журнала
Год издания: 2017
Ключевые слова: сигнал с угловой модуляцией, паразитные комбинационные составляющие, квадратурные каналы, signal with angle modulation, parasitic combinative components, quadrature channels
Аннотация: Рассмотрен метод компенсации искажений, вносимых квантованием мгновенного напряжения сигналов с угловой модуляцией, позволяющий в зависимости от выбранной временной задержки добиться либо полного подавления одной из боковых составляющих сигнала на выходе формирователя аналоговых отсчетов, либо уменьшения в несколько раз одновременнПоказать полностьюо двух соседних боковых составляющих сигнала. For conversion of a digital signal with angle modulation, provided by function of several variables, in an analog signal digital synthesizers of signals are applied. Parasitic combinative components of the signals with angle modulation created by digital methods result from quantization of a phase and the instantaneous stress in digital synthesizers of signals. A natural method of their reduction is increase in quantity of discharges in the generator of analog counting. Parallel switching on of two quantizers which gear characteristics correspond to operation of rounding of the first and second type is equivalent to increase in quantity of discharges of the generator of analog counting at one discharge. It reduces the distortions entered in case of quantization of a phase twice. Generally this method has a low performance as in case of creation the generator of analog counting practically doubles instrumental expenses. However, in the upgraded look it it is easy and without additional instrumental expenses it is possible to implement in digital synthesizers of counting of tension with uniform sampling having the quadrature channels. The main method of creation of digital synthesizers of signals with the quadrature channels is implemented due to additional switching on of the digital multiplier, the adder and the line of a time delay. Depending on the selected temporal time delay this method allows to achieve or complete suppression of one of side components of a signal on an output of the generator of analog counting, or reduction in four and more times at the same time two adjacent side components of a signal. Parallel switching on of two generators of the analog counting having the gear characteristic corresponding to operation of rounding of the first and second types allows to reduce parasitic combinative components of signals with angle modulation by 6 dB. In diagrams with the quadrature channels parasitic combinative components of signals with angle modulation decrease by 3 dB.
Журнал: Успехи современной радиоэлектроники
Выпуск журнала: № 12
Номера страниц: 85-88
ISSN журнала: 20700784
Место издания: Москва
Издатель: Закрытое акционерное общество Издательство Радиотехника