A 2.5 GHz spread spectrum clock generator (SSCG) is proposed for USB 3.0. The low jitter is achieved by setting the normal loop bandwidth to an optimum value, considering both the VCO noise and the quantization noise of modulator. A large peak power reduction is achieved by maintaining a sharp triangular frequency profile through phase/frequency boosting when the phase error between two inputs of PFD exceeds a limit (2 × 2/9 rad). The peak power reduction and the RMS jitter are measured to be -14.9dB at the RBW of 100 KHz and 1.40ps, respectively. The chip area is 0.34mm x 0.36mm in a 0.13um process.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.