US 11,863,133 B2
Trans-impedance amplifier for ultrasound device and related apparatus and methods
Kailiang Chen, Branford, CT (US); Keith G. Fife, Palo Alto, CA (US); Nevada J. Sanchez, Guilford, CT (US); Andrew J. Casper, Clinton, CT (US); and Tyler S. Ralston, Clinton, CT (US)
Assigned to BFLY OPERATIONS, INC., Burlington, MA (US)
Filed by BFLY OPERATIONS, INC., Burlington, MA (US)
Filed on May 26, 2021, as Appl. No. 17/331,538.
Application 17/331,538 is a continuation of application No. 16/178,117, filed on Nov. 1, 2018, granted, now 11,128,267, issued on Sep. 21, 2021.
Application 16/178,117 is a continuation of application No. 14/957,395, filed on Dec. 2, 2015, granted, now 10,187,020, issued on Jan. 22, 2019.
Prior Publication US 2021/0384872 A1, Dec. 9, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H03F 3/16 (2006.01); H03F 1/08 (2006.01); H03F 3/45 (2006.01); G01S 7/52 (2006.01); A61B 5/00 (2006.01); A61B 8/00 (2006.01); A61B 8/08 (2006.01)
CPC H03F 3/16 (2013.01) [A61B 5/6801 (2013.01); A61B 8/4444 (2013.01); G01S 7/52025 (2013.01); H03F 1/086 (2013.01); H03F 3/45183 (2013.01); A61B 8/5207 (2013.01); H03F 2200/408 (2013.01); H03F 2200/555 (2013.01); H03F 2203/45471 (2013.01); H03F 2203/45504 (2013.01); H03F 2203/45631 (2013.01); H03F 2203/45634 (2013.01); H03F 2203/45646 (2013.01); H03F 2203/45648 (2013.01); H03F 2203/45674 (2013.01); H03F 2203/45686 (2013.01); H03F 2203/45692 (2013.01); H03F 2203/45726 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An ultrasound apparatus, comprising:
an ultrasound sensor;
a variable current trans-impedance amplifier (TIA) coupled to the ultrasound sensor and configured to receive and amplify an output signal from the ultrasound sensor, the variable current TIA being a multi-stage operational amplifier having a first stage and a last stage;
wherein the variable current TIA further comprises a variable impedance circuit coupled between an output terminal of the variable current TIA and a node representing an input to the last stage; and
wherein the variable current TIA further comprises a variable feedback impedance circuit coupled between the output terminal of the variable current TIA and a node representing an input to the first stage.