Title :
A phase detector with no dead zone and a very wide output voltage range chargepump
Author :
Ahola, Rami ; Routama, J. ; Lindfors, Saska ; Halonen, Kari
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
This paper discusses the effects of the so-called dead zone in the phase detector on the phase-noise behavior of phase-locked loop frequency synthesizers. A novel phase detector that completely overcomes the dead zone problem is introduced. Also, a chargepump with a very wide output voltage range is presented. This chargepump allows the use of a VCO with a wider tuning range and, thus, also a lower noise sensitivity. Measurement results that verify the proper operation of these blocks are also presented
Keywords :
CMOS digital integrated circuits; detector circuits; digital phase locked loops; frequency synthesizers; phase noise; PLL frequency synthesizers; VCO tuning range; chargepump; dead zone problem; noise sensitivity; phase detector; phase-locked loop synthesizers; phase-noise behavior; Frequency synthesizers; Phase detection; Phase frequency detector; Phase locked loops; Phase noise; Pulse generation; Radio frequency; Space vector pulse width modulation; Voltage; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704213
