Transimpedance amplifiers for ultrasonic sensing applications
US10848107B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2018 |
| Grant date | Nov 24, 2020 |
| Priority date | — |
| Expiry date | Dec 20, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/72
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Various transimpedance amplifier (TIA) arrangements for ultrasonic front-end receivers used in ultrasonic sensing applications are disclosed. An example TIA includes three common-source gain stages in a feedback loop with a common-gate stage. In some aspects, the TIA may include a level shifter configured to maintain the voltage at the gate of a transistor used to implement the first common-source gain stage of the feedback loop shifted by a certain amount with respect to the voltage at an input port to the TIA. In some aspects, at least portions of the TIA may be biased using bias currents that are configured to be process-, supply voltage-, and/or temperature-dependent. Various embodiments of the TIAs disclosed herein may benefit from one or more of the following advantages: reduced noise, reduced input impedance, reduced temperature coefficient of input impedance, and stability for a wide range of sensor frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.