Search International and National Patent Collections

1. (WO2018164828) FRACTIONAL CLOCK GENERATOR WITH RAMP CONTROL INCLUDING FIXED TIME INTERVAL AND COARSE/FINE FREQUENCY CHANGE STEPS

Pub. No.:    WO/2018/164828    International Application No.:    PCT/US2018/018623
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Tue Feb 20 00:59:59 CET 2018
IPC: H03K 3/017
H03L 7/085
Applicants: QUALCOMM INCORPORATED
Inventors: BOWLES, Kevin
PAL, Dipti Ranjan
Title: FRACTIONAL CLOCK GENERATOR WITH RAMP CONTROL INCLUDING FIXED TIME INTERVAL AND COARSE/FINE FREQUENCY CHANGE STEPS
Abstract:
A clock signal generator including a fractional clock divider and a frequency ramp control circuit. The fractional clock divider is configured to generate an output clock signal with a frequency being a divider ratio multiplied by a frequency of an input clock signal. The frequency ramp control circuit is configured to provide the fractional clock divider a set of divider ratios so that the frequency of the output clock signal is ramped in steps from a current frequency to a target frequency. The frequency ramp control circuit is configured to produce frequency change steps each having substantially the same duration. The frequency ramp control circuit is also configured to provide the set of divider ratios such as a first portion of the frequency ramp is performed using coarse frequency changes and a second portion of the ramp is performed using at least one fine frequency change.