Enhanced time division duplexing (TDD) transceiver circuitry
US6591086B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 2000 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Apr 24, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/52
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication transceiver circuit intended for operation in a Time Division Duplex (TDD) system. The configuration eliminates the need for transmit-receive switches and the circuitry needed to operate them. Instead, a three port circulator is used to couple a transmitter section and receiver section to a common antenna. A signal power detector and blanking circuit are coupled to the receiver section input and arranged to generate a blanking signal for an input receiver amplifier. This disables the receiver during conditions when power reflected back through the antenna and circulator would otherwise saturate the receiver. In a preferred environment, a second circulator is connected to an intermediate frequency (IF) side of the transceiver together with a pair of isolators to permit the transceiver to be connected to IF equipment with a single cable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.