Abstract
A Delay-Locked Loop (DLL) with a modified charge pump circuit is proposed for generating high-resolution linear delay steps with sub-picosecond jitter performance and adjustable delay range. The small-signal model of the modified charge pump circuit is analyzed to bring forth the relationship between the DLL’s internal control voltage and output time delay. Circuit post-layout simulation shows that a 0.97 ps delay step within a 69 ps delay range with 0.26 ps Root-Mean Square (RMS) jitter performance is achievable using a standard 0.13 µm Complementary Metal-Oxide Semiconductor (CMOS) process. The post-layout simulation results show that the power consumption of the proposed DLL architecture’s circuit is 0.1 mW when the DLL is operated at 2 GHz.
Highlights
Delay-Locked Loops (DLLs) with high-resolution delay steps are extensively used for time management of large systems [1]
DLLs are used in the compensation for PVT variations and any delay mismatch that may be caused to signals during the operation of many high-frequency VLSI circuits [3]
For all of these applications, DLLs should generate an adequate amount of lock/delay range while maintaining the output jitter as low as possible
Summary
Delay-Locked Loops (DLLs) with high-resolution delay steps are extensively used for time management of large systems [1]. The capacitor-reset technique is widely used to reinitialize a control voltage to a fixed initial value and has been applied in many circuits such as pixels of image sensors and PLL circuits [10,11] At this point, mathematical analysis confirmed by circuit simulation, our proposed technique is capable of generating a comparably wide delay range and picosecond-resolution delay steps with a sub-picosecond jitter performance. Mathematical analysis confirmed by circuit simulation, our proposed technique is capable of generating a comparably wide delay range and picosecond-resolution delay steps with a sub-picosecond jitter performance This architecture consumes a relatively small area and power compared with the available techniques reported in literature.
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