TY - JOUR A2 - Rhee, Woogeun AU - Kawamoto, Takashi AU - Ueda, Kazuhiro AU - Noto, Takayuki PY - 2012 DA - 2012/01/23 TI - 480 MHz 10-tap Clock Generator Using Edge-Combiner DLL for USB 2.0 Applications SP - 267247 VL - 2012 AB - A clock generator with an edge-combiner DLL (ECDLL) has been developed for USB 2.0 applications. The clock generator generates 480 MHz 10-tap output signals from a 12 MHz reference signal and consists of three DLLs to shrink the design area so that it is smaller than a conventional one based on a PLL. Each DLL is applied to our proposed shot pulse reset technique to prevent from a harmonic lock and is applied to a voltage-controlled delay line (VCDL) with a trimming function to operate against any process voltage temperature (PVT) variations. A 90 nm CMOS process was used to fabricate our proposed clock generator. The 480 MHz 10-tap output signals satisfy the USB 2.0 specifications. A power consumption is less than 1.3 mW and a locking time is less than 3.5 μs, which are far less than a conventional one, 10.0 μs. The design area is 200×225μm, which is half that of the conventional one. SN - 2090-0147 UR - https://doi.org/10.1155/2012/267247 DO - 10.1155/2012/267247 JF - Journal of Electrical and Computer Engineering PB - Hindawi Publishing Corporation KW - ER -