US 12,261,630 B2
Differential delta-sigma modulator for a hearing aid
Niels Ole Knudsen, Humlebaek (DK)
Assigned to Widex A/S, Lynge (DK)
Appl. No. 17/765,688
Filed by WIDEX A/S, Lynge (DK)
PCT Filed Sep. 28, 2020, PCT No. PCT/EP2020/077080
§ 371(c)(1), (2) Date Mar. 31, 2022,
PCT Pub. No. WO2021/063874, PCT Pub. Date Apr. 8, 2021.
Claims priority of provisional application 62/910,907, filed on Oct. 4, 2019.
Prior Publication US 2022/0345151 A1, Oct. 27, 2022
Int. Cl. H03M 3/00 (2006.01); H03F 3/187 (2006.01); H04R 25/00 (2006.01)
CPC H03M 3/43 (2013.01) [H03F 3/187 (2013.01); H03M 3/496 (2013.01); H04R 25/505 (2013.01); H03F 2200/03 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A differential delta-sigma-modulator having an integrator including a pair of single-ended amplifiers and comprising:
a sample clock driving a first switchable capacitor configuration and a second switchable capacitor configuration at a predetermined switching cycle;
wherein the first switchable capacitor configuration is adapted for sampling respective outputs from the pair of single-ended amplifiers on a pair of output sampling capacitors in a first part of the switching cycle; and
wherein the second switchable capacitor configuration is adapted for charging a common mode capacitor with the average voltage of the voltage sampled by the pair of output sampling capacitors in a second part of the switching cycle, wherein the voltage across the common mode capacitor represents the common mode voltage for the integrator;
wherein a comparator is adapted for comparing the output from the pair of single-ended amplifiers and outputting a logical level in accordance to the comparison; and
wherein the first switchable capacitor configuration in the first part of the switching cycle is adapted for sampling an output signal from the comparator by means of a pair of common mode feedback capacitors; and the second switchable capacitor configuration, in the second part of the switching cycle, is adapted for connecting the pair of common mode feedback capacitors to respective inputs of the pair of single-ended amplifiers.