Patent ID: 8380138
Filing Date: 2013-02-19
Classification: H03K

Abstract:
1. An apparatus for adjusting a duty cycle of a periodic signal to generate an adjusted signal, the adjusted signal being alternately high (HI) and low (LO) over each cycle, the apparatus comprising: a dual-phase charge pump configured to, during a first phase, supply current to a charge pump node when the adjusted signal is HI and to sink current from the charge pump node when the adjusted signal is LO, the dual-phase charge pump further configured to, during a third phase, supply current to the charge pump node when the adjusted signal is LO and to sink current from the charge pump node when the adjusted signal is HI; a charge and sample module comprising an integration capacitor having first and second terminals, the charge and sample module configured to: a de-skew module for adjusting the duty cycle of the periodic signal to generate an adjusted periodic signal, the duty cycle of the periodic signal adjusted according to a voltage across the first sampling capacitor.