US 11,894,864 B2
Analog-to-digital converter having punctured quantizer
John M. Khoury, Austin, TX (US)
Assigned to Silicon Laboratories Inc., Austin, TX (US)
Filed by Silicon Laboratories Inc., Austin, TX (US)
Filed on Mar. 23, 2022, as Appl. No. 17/701,742.
Prior Publication US 2023/0308111 A1, Sep. 28, 2023
Int. Cl. H03M 3/00 (2006.01); H04R 3/00 (2006.01); H04R 3/04 (2006.01); H04R 3/02 (2006.01); H03F 3/183 (2006.01)
CPC H03M 3/422 (2013.01) [H03F 3/183 (2013.01); H03M 3/356 (2013.01); H03M 3/458 (2013.01); H04R 3/02 (2013.01); H04R 3/04 (2013.01); H03F 2200/03 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a sum circuit to receive an analog input signal and a feedback reference signal and generate a sum signal;
a feedback circuit coupled to the sum circuit to provide the feedback reference signal to the sum circuit;
a filter coupled to the sum circuit to receive the sum signal and generate a filtered signal; and
a punctured quantizer coupled to the filter to receive the filtered signal and quantize the filtered signal to a digital output and to output the digital output and to provide the digital output to the feedback circuit, the punctured quantizer comprising a non-linear quantizer having a plurality of levels, the plurality of levels related but having one or more gaps between at least some of the plurality of levels.