US 11,942,944 B2
Oscillator with improved frequency stability
Anthony Sou, Sedgefield (GB)
Assigned to PRAGMATIC PRINTING LTD., Sedgefield (GB)
Appl. No. 17/603,062
Filed by PRAGMATIC PRINTING LTD., Sedgefield (GB)
PCT Filed Apr. 22, 2020, PCT No. PCT/GB2020/051001
§ 371(c)(1), (2) Date Oct. 12, 2021,
PCT Pub. No. WO2020/217055, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 1905729 (GB), filed on Apr. 24, 2019.
Prior Publication US 2022/0182045 A1, Jun. 9, 2022
Int. Cl. H03K 3/03 (2006.01); H03K 5/01 (2006.01); H03K 5/00 (2006.01)
CPC H03K 3/0315 (2013.01) [H03K 5/01 (2013.01); H03K 2005/00078 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An oscillator, having an input terminal, and an output terminal providing an oscillating output signal of a predetermined frequency comprising:
a ring oscillator stage, having a first supply voltage response characteristic, configured to provide a predetermined first propagation delay depending on a supply voltage;
an RC oscillator stage, having a second supply voltage response characteristic that is inversely correlated to said first supply voltage response characteristic, operatively coupled with said ring oscillator stage and configured to provide a predetermined second propagation delay depending on said supply voltage, and
wherein said predetermined first propagation delay of said ring oscillator stage and said predetermined second propagation delay of said RC oscillator stage are each approximately one half of a period of said oscillating output signal of a predetermined frequency, so as to generate said oscillating output signal of a predetermined frequency and stabilise said frequency of said oscillating output signal to variations of a predetermined voltage range of said supply voltage.