Using a multi-tone signal to tune a multi-stage low-noise amplifier
US11070196B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 2020 |
| Grant date | Jul 20, 2021 |
| Priority date | — |
| Expiry date | Jan 7, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/04
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An example process includes reducing a quality factor of a first tunable bandpass filter, used, for example, in a low-noise amplifier stage of a polar receiver. A first wideband test signal centered at a desired center frequency of a second tunable bandpass filter is received. A frequency response of the second tunable bandpass filter to the first wideband test signal is estimated using a Fast Fourier Transform (FFT) signal processor. At least a resonant frequency or a quality factor of the second tunable bandpass filter are calibrated based at least in part on a portion of the estimated frequency response of the second tunable bandpass filter obtained from the FFT signal processor. Frequency response characteristics of the first tunable bandpass filter may be similarly tuned in accordance with the example process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.