Two-point modulator with matching gain calibration
US10291389B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 2018 |
| Grant date | May 14, 2019 |
| Priority date | — |
| Expiry date | Apr 1, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/7073
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A modulation circuit includes a locked loop circuit with two-point modulation control and a phase-frequency detector configured to compare a reference frequency signal with a feedback frequency signal. A two-point modulation control circuit includes a first modulation path having a controllable gain and coupled to one of the first and second modulation control points and a second modulation path coupled to another of the first and second modulation control points. Gain matching of the first and second modulation paths is accomplished through the operation of a calibration circuit. The calibration circuit includes a phase detector circuit configured to compare the reference frequency signal with the feedback frequency signal to generate a phase detect signal, and a gain control circuit configured to adjust the controllable gain of the first modulation path as a function a correlation of the phase detect signal with signs of the modulation data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.