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Design of High-Order Type-II Delay-Locked Loops With a Fast-Settling-Zero-Overshoot Step Response and Large Jitter-Rejection Capabilities.
- Source :
-
IEEE Transactions on Circuits & Systems. Part I: Regular Papers . Jun2018, Vol. 65 Issue 6, p1805-1818. 14p. - Publication Year :
- 2018
-
Abstract
- In this paper, a design method for high-order delay-lock loops (DLLs) is presented and verified through simulations and physical experiments. The general approach is based on selecting the closed-loop transfer function of the DLL, together with identifying the coefficients of the phase-detector and voltage-controlled delay line, and subsequently, solving for parameters of the loop filter of the DLL. Past DLL design approaches relied more on establishing a desired phase margin requirement than attempting to establish a desired input–output behavior. This limited the realization of DLLs to second order; largely a result of the complicated mathematics that arise. As the method proposed in this paper is based on selecting a desired closed-loop transfer function, the issues of stability or phase margin never come to the forefront. This paper will show how a DLL can be designed to achieve a fast-settling-zero-overshoot step response with large jitter-rejection capabilities. The method is simple and easy to execute. No optimization or iteration is necessary. The method is similar to the methods used to design active-RC filter circuits. A fully programmable experimental prototype involving a custom IC implemented in a 130-nm IBM CMOS process was constructed. DLLs with orders ranging from second to eighth will be investigated. [ABSTRACT FROM PUBLISHER]
- Subjects :
- *DELAY-locked loops
*TRANSFER functions
*PHASE detectors
Subjects
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 65
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 129614757
- Full Text :
- https://doi.org/10.1109/TCSI.2017.2771141