The general expression for approximation of power spectral density (SD) of phase noise direct digital synthesizers. The design procedure of factors of SD approximation of phase noise is developed. Calculated SD for integrated DDS from Analog Devices have shown good coincidence with experimental characteristics.Index Terms -DDS, signal synthesis, phase noise, spectral density.
Narrowing the spectrum of phase-coded pulses by their modifying in radar transmitter is investigated. Three lows of slowing the phase switching rate (linear, cosine-squared and exponential) are considered. Correlation and spectral properties of the signals are investigated. The structure of quadrature shaper for implement the modulation was proposed.
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