公开(公告)号：US11579106B2

公开(公告)日：2023-02-14

申请号：US16852736

申请日：2020-04-20

Applicant: Texas Instruments Incorporated

Inventor： Aatish Chandak ,  Raja Reddy Patukuri ,  Aravind Miriyala ,  Sandeep Oswal

IPC: G01N27/02 ,  A61B5/053 ,  A61B5/00 ,  A61B5/11 ,  A61B5/0205 ,  A61B5/024

Abstract: The disclosure provides a measurement circuit. The measurement circuit includes a control engine. An excitation source is coupled to the control engine. A first set of electrodes and a second set of electrodes are coupled to the excitation source and receive current from the excitation source. The control engine operates the excitation source in a first mode and a second mode. The control engine, in the first mode, measures a parasitic impedance associated with the first and the second set of electrodes, and the control engine, in the second mode, measures an impedance of the first and the second set of electrodes and of an external object.

公开(公告)号：US20220337203A1

公开(公告)日：2022-10-20

申请号：US17231728

申请日：2021-04-15

Applicant: Texas Instruments Incorporated

Inventor： Rahul Sharma ,  Jagannathan Venkataraman ,  Sandeep Oswal ,  Visvesvaraya Appala Pentakota

IPC: H03F3/19 ,  H03H11/04 ,  H03M1/12

Abstract: A low noise amplifier for an RF sampling analog front end. The amplifier includes digital step attenuation for applying a selected attenuation to signals received at an input node, and a gain stage coupled to amplify the attenuated signal from the digital step attenuation circuit. In a differential amplifier implementation, a first input capacitor is coupled between a positive side input node and an output of the negative side digital attenuation circuit, and a second input capacitor is coupled between a negative side input node and an output of the positive side digital step attenuation circuit. In some embodiments, variable feedback circuits are coupled between each input node and an output of the corresponding gain stage, to selectively apply active termination at the input at high gain settings of the amplifier. Variable input and output resistors, and programmable noise filtering at the output, are provided in some embodiments.

公开(公告)号：US10985708B2

公开(公告)日：2021-04-20

申请号：US15980771

申请日：2018-05-16

Applicant: Texas Instruments Incorporated

Inventor： Vajeed Nimran ,  Raja Sekhar ,  Sandeep Oswal ,  Shagun Dusad

IPC: H03F1/56 ,  H03F3/45 ,  H03G1/00 ,  H03G3/30 ,  G01S7/52

Abstract: The disclosure provides a time gain compensation (TGC) circuit. The TGC circuit includes an impedance network. A differential amplifier is coupled to the impedance network. The differential amplifier includes a first input port, a second input port, a first output port and a second output port. A first feedback resistor is coupled between the first input port and the first output port. A second feedback resistor is coupled between the second input port and the second output port. The impedance network provides a fixed impedance to the differential amplifier when a gain of the TGC circuit is changed from a maximum value to a minimum value.