US 12,355,411 B2
Nonlinearity cancellation circuit for active filters
Subha Sarkar, Bangalore (IN); Rajat Agarwal, Bangalore (IN); and Nagendra Krishnapura, Chennai (IN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Oct. 31, 2023, as Appl. No. 18/498,520.
Claims priority of application No. 202341010805 (IN), filed on Feb. 17, 2023.
Prior Publication US 2024/0283431 A1, Aug. 22, 2024
Int. Cl. H03H 11/04 (2006.01)
CPC H03H 11/04 (2013.01) 18 Claims
OG exemplary drawing
 
1. A circuit, comprising:
an active filter, including an input, a first output, and a second output;
a first capacitor having a first terminal and a second terminal, wherein the first terminal of the first capacitor is coupled to the first output of the active filter, the second terminal of the first capacitor is coupled to the input of the active filter, and wherein the first capacitor has a capacitance value; and
a capacitor bank having a first terminal and a second terminal, wherein the first terminal of the capacitor bank is coupled to the second output of the active filter, wherein the second terminal of the capacitor bank is coupled to the second terminal of the first capacitor and coupled to the input of the active filter, wherein the capacitor bank has a capacitance that is equivalent to the capacitance value of the first capacitor to configure the capacitor bank to provide a first current that is proportional in amplitude to and opposite in phase from a current of the first capacitor.