Enabling RX signal path synchronization and alignment signals in a highly integrated TX RFIC
US9647829B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2015 |
| Grant date | May 9, 2017 |
| Priority date | — |
| Expiry date | Jun 10, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/38
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transmit (TX) signal path circuit in a multiple-input, multiple-output (MIMO) transceiver responsive to a digital front end (DFE) for generating receive (RX) path phase alignment signals is disclosed. A digital up-conversion block uses a first numerically-controlled oscillator (NCO) for generating digital intermediate frequency (IF) signals for ordinary TX signal generation, and a different, second NCO for generating digital IF signals for RX phase alignment signal generation. An RF up-conversion block uses a TX local oscillator (LO) for generating analog RF signals for ordinary TX signal generation, and a different feedback (FB) LO for generating analog RF signals for RX phase alignment signal generation. Thus, phase alignment of the circuitry used for ordinary TX signal generation is left undisturbed by RX phase alignment signal generation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.