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 |
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.
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