The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2019
Filed:
Mar. 13, 2018
Cirrus Logic International Semiconductor Ltd., Edinburgh, GB;
Louis Frew, Glasgow, GB;
Kapil Sharma, Edinburgh, GB;
David Paul Singleton, Edinburgh, GB;
Andrew James Howlett, Edinburgh, GB;
Cirrus Logic, Inc., Austin, TX (US);
Abstract
This application relates to analog-to-digital converter (ADC) circuitry (). A time-encoding modulator (TEM) has a comparator () and a loop filter () configured to generate a pulse-width-modulated (PWM) signal (S) in response to an input signal (S) and a feedback signal (S). A controlled oscillator, such as a VCO () receives the PWM signal and generates an output oscillation signal (S) with a frequency that varies based on a drive signal at a drive node (), e.g. a drive node of a ring oscillator (). The controlled oscillator () comprises at least one control switch () controlled by a switch control signal (S) generated from the received PWM signal so as to control the drive strength of the drive signal applied to the drive node (). The feedback signal (S) for the TEM () is derived from the controlled oscillator () so as to include any timing error between the PWM signal and the switch control signal (S) applied to said control switch.