METHOD AND APPATATUS FOR DIGITAL-CONTROLLED OSCILLATING USING WIDE BAND ACTIVE INDUCTOR WITH 3-STEP COARSE TUNING

摘要

PURPOSE: the method and apparatus of numerical control oscillation, which are arranged using broadband active inductor with three step coarse tuning modes, uses three step coarse tuning modes with broad-frequency tuning domain. ;CONSTITUTION: a kind of digital controlled oscillator core (310) includes lid group, active inductance, manual inductor, negative GM circuit. A kind of three step coarse tuning operating numerical control oscillators (300) of coarse tuning digitial controller (320) control. The DCO_OUT and the core of above-mentioned DCO_OUTB digital controlled oscillators output distribute 4 (or 8) and pass through partition (340). The output is input into SDM_CLK sigma-DELTA modulators (330). ;The 2012 of copyright KIPO submissions