Output impedance calibration of integrated switched-mode power amplifiers
US10739424B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 26, 2018 |
| Grant date | Aug 11, 2020 |
| Priority date | — |
| Expiry date | Mar 26, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/583
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods for reducing variability in the output impedance of an integrated switch-mode power amplifier (PA) split the output impedance between passive resistor, which may be on-chip, and a MOSFET switch of the amplifier. The PA may have a single-ended configuration or a differential configuration having two single-ended structures operating with opposite phases. In one implementation, the size of the MOSFET switch is larger than that of the MOSFET switch implemented in a conventional PA, but the size is still acceptable to operate the PA at a desired frequency. In addition, a calibration approach may be utilized to ensure that the MOSFET switch has a controlled and calibrated ON resistance, thereby providing stable output power levels of the PA and ensuring consistency and repeatability in NMR measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.