In this paper FPGA implementation of ADPLL using Verilog is presented. ADPLL with ripple reduction techniques is also simulated and implemented on FPGA. For simulation ISE Xilinx 10.1 CAD is used.Vertex5 FPGA (Field Programmable Gate Array) is used for implementation. ADPLL performance improvement, while using ripple reduction techniques is also discussed. The ADPLL is designed at the central f...

This paper presents a low power, low jitter, PVTstable film-bulk acoustic wave resonator (FBAR) based all digital phase-locked loop (ADPLL) in a 65nm CMOS process. We introduce a power-efficient integer-N ADPLL architecture, where the digitally-controlled FBAR oscillator (FBAR DCO) achieves phase-lock to a reference clock without any explicit frequency dividers in the feedback path. The simplif...

All Digital Phase locked loops (ADPLL) plays a major role in System on Chips (SoC). Many EDA tools are used to design such complicated ADPLLs. It operates on two modes such as frequency acquisition mode and phase acquisition mode. Frequency acquisition mode is faster compared to Phase acquisition, hence frequency synthesis is performed. The CMOS technology is used to design such a complex desig...

An all-digital phase-locked loop (ADPLL) for high-speed clock generation is presented in this brief. The proposed ADPLL architecture uses both a digital control mechanism and a ring oscillator and, hence, can be implemented with standard cells. The ADPLL implemented in a 0.3m one-poly-four-metal CMOS process can operate from 45 to 510 MHz and achieve worst case frequency acquisition in 46 refer...

--The All-Digital Phase-Locked Loop (ADPLL) is digital electronic circuit that are used in modern electronic communication systems like frequency synthesizer, modulator/demodulator etc. This paper presents a review of various ADPLL techniques. The range of input frequency of ADPLL is 40 to 98 MHz; the output frequency may be up to 2.92 to 4 GHz range. The components of ADPLL such as phase detec...

This paper presents a methodology to determine all-digital phase-locked loop (ADPLL) circuit variables based on required design specifications, including output phase noise, fractional spur and locking time. An analytical model is developed to characterize the effects of different noise sources on ADPLL output phase noise and fractional spur. Applying the proposed noise model, circuit variables...

The All Digital Phase Locked Loop consists of full digital components which are used in advanced communication systems like frequency synthesizer, Carrier and clock recovery, modulator/demodulator etc. Hence the performance analysis of ADPLL becomes very necessary when designing these equipments. The ADPLL contains phase detector, loop filter and Digital controlled oscillator. The performance o...

An efficient architecture for low jitter All Digital Phase Locked Loop (ADPLL) suitable for high speed SoC applications is presented in this paper. The ADPLL is designed using standard cells and described by Hardware Description Language (HDL). The ADPLL implemented in a 90 nm CMOS process can operate from 10 to 200 MHz and achieve worst case frequency acquisition in 14 reference clock cycles. ...

Design of a fast-locking phase-locked loop (PLL) is one of the major challenges in today’s wireless communications. A recently reported digitally controlled oscillator (DCO)-based all-digital PLL (ADPLL) can achieve an ultrashort settling time of 10 ms. This study describes a new DCO tuning word (OTW) presetting technique for the ADPLL to further reduce its settling time. Estimating the require...

Despite their high degree of reconfigurability and friendliness to technology scaling, traditional ADPLL-based frequency synthesizers tend to come at the price of increased power consumption at their feedback path, compared to charge-pump based solutions. The main power consumption bottleneck is the TDC that operates at the high output frequency rate. A modified version of the ADPLL architectur...