ACTIVE QUASI CIRCULATOR

摘要

An RF quasi circulator circuit is described herein. In accordance with one example of the disclosure the circuit includes a receive port, a transmit port and an antenna port as well as a differential amplifier stage having a first input, a second input and an output that is coupled to the receive port. The circuit further includes a first phase shifting element and a second phase shifting element. The first phase shifting element is coupled between the transmit port and the first input of the differential amplifier and the second phase shifting element is coupled between the transmit port and the second input of the differential amplifier. A tunable impedance is coupled to the differential amplifier, and the antenna port is coupled to the first input of the differential amplifier. The tunable impedance is controlled to tune the damping in a signal path from the transmit port to the receive port.

主权项

1. An RF quasi circulator circuit, comprising:
a receive port, a transmit port and an antenna port; a differential amplifier stage having a first input, a second input, and an output that is coupled to the receive port; a first phase shifting element and a second phase shifting element, the first phase shifting element being coupled between the transmit port and the first input of the differential amplifier, and the second phase shifting element being coupled between the transmit port and the second input of the differential amplifier; and a tunable impedance coupled to the differential amplifier, wherein the antenna port is coupled to the first input of the differential amplifier, and wherein the tunable impedance is controlled to tune a damping in a signal path from the transmit port to the receive port.