RECEIVER

• Main Authors: SKÅR, Torleif, BAGGA, Sumit
• Format: Patent
• Language: English; French; German
• Published: 23.10.2024
• Subjects: AMPLIFIERS; ANALOGOUS ARRANGEMENTS USING OTHER WAVES; BASIC ELECTRONIC CIRCUITRY; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING; TRANSMISSION

A differential transceiver circuit for transmitting and receiving via a single antenna interface, the transceiver circuit comprising: a differential pair of signal paths, comprising a first signal path and a second signal path; differential amplifier, having an input and an output, the input arranged to receive a receive signal from the antenna interface; a differential transmitter arranged to generate a differential pair of transmit signals for transmission to the antenna interface, the differential pair of transmit signals comprising a first transmit signal connected to the first signal path between the antenna and the receiver input and a second transmit signal connected to the second signal path between the antenna and the receiver input; a switching network on the second signal path arranged on the output side of the differential amplifier and arranged to divert the amplifier output on the second signal path to a signal ground node; and an injection circuit arranged to inject a copy of the first transmit signal onto the second signal path downstream of the switching network. The receive signal (and unwanted transmit signal) on one signal path is diverted to ground and therefore not available for further processing. The transmit signal corresponding to the other differential signal path is inserted so that the same transmit signal is present on both differential signal paths. When processed by differential downstream components with high common-mode rejection, the transmit signals cancel out, leaving just the receive signal on one signal path to be processed. This allows the receive signal to be received and processed throughout transmission and therefore allows pseudo-full-duplex operation.