Compact, high power supply rejection ratio, low power semiconductor digitally controlled oscillator architecture

摘要

A high PSRR, low power semiconductor digitally controlled oscillator (DCO) architecture employs only one simple current steering D/A converter directly on top of a multi-stage current controlled oscillator. The architecture provides a good building block for many circuit applications, e.g., all digital phase lock loops, direct modulation transmitters for wireless devices, and the like.