Title :
PLL synthesizer with very low discrete spurious
Author :
Brezovic, Z. ; KudjÁk, Vladimir
Author_Institution :
Dept. of Radio Electron., Slovak Univ. of Technol. in Bratislava, Bratislava
Abstract :
Frequency, transient and noise numerical analysis of a triple active RC notch filters (ARCN filters) are presented in this contribution. ARCN filters analyzed here are used for additional damping of the first unwanted harmonics (1., 2. and 4. ) at the phase detector output voltage. Every additional passive filter inside the PLL very often causes instability due to its too big additional phase shift. On the base numerical simulations results it is possible to design good ARCN filters with small phase shift within active PLL bandwidth. Also the noise analysis and noise optimization of such filters was carried out.
Keywords :
active filters; notch filters; numerical analysis; phase locked loops; stability; ARCN filters; PLL synthesizer; charge pump phase detector; noise numerical analysis; noise spectral density; phase noise; transient stability; triple active RC notch filters; Active filters; Active noise reduction; Band pass filters; Damping; Frequency; Harmonic analysis; Numerical analysis; Phase locked loops; Synthesizers; Transient analysis; PLL; PLL frequency characteristics; PLL transient stability; active RC notch filter; charge pump phase detector; computer simulation model; linear and nonlinear model of PLL; noise spectral density; phase noise; spurious signal in PLL;
Conference_Titel :
Radioelektronika, 2008 18th International Conference
Conference_Location :
Prague
Print_ISBN :
978-1-4244-2087-2
Electronic_ISBN :
978-1-4244-2088-9
DOI :
10.1109/RADIOELEK.2008.4542718
