US 11,962,317 B2
Noise shaping in multi-stage analog-to-digital converters
Behnam Sedighi, La Jolla, CA (US); Shi Bu, Los Angeles, CA (US); Elias Dagher, Laguna Niguel, CA (US); and Dinesh Jagannath Alladi, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on May 31, 2022, as Appl. No. 17/804,779.
Prior Publication US 2023/0387929 A1, Nov. 30, 2023
Int. Cl. H03M 1/08 (2006.01)
CPC H03M 1/0854 (2013.01) 29 Claims
OG exemplary drawing
 
1. An analog-to-digital converter (ADC) comprising:
a first conversion stage having a residue output;
an amplifier having an input selectively coupled to the residue output of the first conversion stage;
a second conversion stage having an input selectively coupled to an output of the amplifier; and
a switched-capacitor network having a first port coupled to the input of the amplifier and having a second port coupled to the input of the second conversion stage, the switched-capacitor network being configured to provide a second-order or higher noise transfer function for noise shaping of quantization noise of the second conversion stage.