DocumentCode :
3209985
Title :
A fast digital phase locked loop based on model predictive controller
Author :
Sayadi, Mohamad ; Farshidi, Ebrahim ; Ghaffari, Valiollah
Author_Institution :
Dept. of Electr. Eng., Shahid Chamran Univ. of Ahvaz, Ahvaz, Iran
fYear :
2012
fDate :
15-17 May 2012
Firstpage :
65
Lastpage :
69
Abstract :
This paper presents a new approach for design of a digital phase locked loop. By employing a digitally controlled oscillator (DCO) and a time-to-digital converter (TDC), the loop filter of a DPLL becomes all-digital. Instead of designing the loop filter by digitizing a continuous-time loop response as has been commonly done, more sophisticated control schemes can be employed. In this paper, we proposed to design feedback loop filter by first modeling the DCO and TDC as appropriate model in transfer function form. Then by employing model predictive control (MPC) approach for design of loop filter instead of existing conventional loop filter generate optimal signal that accurately account for the transport delay in the digital feedback system. Using the proposed approach loop filter can overcome latency problem that digital feedback loops suffer and imposes limitation on loop bandwidth and even can make instability on loop. Simulation results by MATLAB confirm ability of the proposed design and shows it is suitable for digital phase locked loop.
Keywords :
convertors; digital control; digital phase locked loops; feedback; filtering theory; oscillators; predictive control; transfer functions; DCO; DPLL; MATLAB; TDC; continuous-time loop response; digital feedback loops; digitally controlled oscillator; fast digital phase locked loop design; feedback loop filter design; latency problem; loop bandwidth limitation; loop filter; model predictive controller; optimal signal generation; time-to-digital converter; transfer function form; transport delay; CMOS integrated circuits; Oscillators; Predictive models; Semiconductor device modeling; Switches; Transient response; Digital phase-locked loop; Model Predictive Controller; digitally controlled oscillator; time-to-digital converter;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Engineering (ICEE), 2012 20th Iranian Conference on
Conference_Location :
Tehran
Print_ISBN :
978-1-4673-1149-6
Type :
conf
DOI :
10.1109/IranianCEE.2012.6292324
Filename :
6292324
Link To Document :
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