Adaptive quadrature clock generator

Abstract

In this paper we propose the architecture for multi-phases clocking distribution. Based on QCG architecture, we propose a new adaptive QCG to increase its operation frequency range. The adaptive QCG can automatically track and lock phase difference when input frequency is different. This architecture is implemented by UMC 0.13 mu m IP8M process and employed by on-chip transceiver. The average power consumption is 6.43 mW at 2 GHz clocking frequency. The operation frequency is from 500 MHz to 2.5 GHz.