Title :
A noise shaped flash time to digital converter for all digital frequency synthesizers
Author :
Ensafdaran, Masoud ; Atarodi, Mojtaba
Author_Institution :
Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran
Abstract :
Reduction of Time to Digital Converter (TDC) quantization related phase noise is one of the most important challenges in all digital frequency synthesizer design. In this paper, a new structure is proposed to shape the quantization noise of flash TDCs. To verify effectiveness of the proposed general noise shaping technique, it is employed on a single delay chain flash TDC. To compensate the process variation effects on the implemented circuits, a calibration technique is also proposed. The design is implemented in 0.18 mum CMOS technology. Simulations show effective noise shaping of output quantization noise.
Keywords :
CMOS digital integrated circuits; circuit noise; frequency synthesizers; phase noise; CMOS technology; TDC quantization; calibration technique; digital frequency synthesizers; noise shaped flash time to digital converter; phase noise; size 0.18 mum; CMOS technology; Calibration; Circuit noise; Circuit simulation; Delay effects; Digital-to-frequency converters; Frequency synthesizers; Noise shaping; Phase noise; Quantization;
Conference_Titel :
Circuit Theory and Design, 2009. ECCTD 2009. European Conference on
Conference_Location :
Antalya
Print_ISBN :
978-1-4244-3896-9
Electronic_ISBN :
978-1-4244-3896-9
DOI :
10.1109/ECCTD.2009.5275130
