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:
Aug. 04, 2020
Filed:
Apr. 10, 2019
Silicon Laboratories Inc., Austin, TX (US);
Wenhuan Yu, Austin, TX (US);
Abdulkerim L. Coban, Austin, TX (US);
SILICON LABORATORIES INC., Austin, TX (US);
Abstract
In one form, an analog-to-digital converter (ADC) includes first and second ring-oscillator ADCs, a modulus subtractor, and a decimation filter. The first and second ring-oscillator ADCs are responsive to true and complement input voltages, respectively, have outputs for providing first and second digital phase signals, respectively, each having a first predetermined number of bits sampled at a first frequency. The modulus subtractor subtracts the second digital phase signal from the first digital phase signal to provide a phase difference signal. The decimation filter differentiates the phase difference signal at a second frequency lower than said the frequency to provide a frequency signal proportional to a differential voltage between the true input voltage and the complementary input voltage, and decimates the frequency signal to provide a digital code having a second predetermined number of bits greater than the first predetermined number of bits.