Bidirectional amplifier of TDD mode

Abstract

The invention discloses a bidirectional amplifier of a TDD mode. The bidirectional amplifier comprises a switch circuit, an emission circuit, a transmit-receive isolation circuit, a receiving circuit and a transmit-receive control circuit. The transmit-receive isolation circuit comprises a double circulator. An output terminal of the emission circuit is connected to an input terminal of the double circulator. An input terminal of the receiving circuit is connected to a receiving terminal of the double circulator. An antenna terminal of the double circulator is connected to an antenna. The antenna terminal receives / sends an antenna signal. The transmit-receive control circuit is connected to the switch circuit, the emission circuit, the receiving circuit and the transmit-receive isolation circuit. The invention provides a receiving and emission high isolation circuit based on the TDD mode; and simultaneously a low noise receiving requirement and a linear large-power output requirement are satisfied, and stable and anti-interference work can be performed.

Description

technical field [0001] The invention relates to an amplifier in the communication field, in particular to a bidirectional amplifier with a TDD-based working mode. Background technique [0002] The duplex communication modes adopted by various communication systems are divided into TDD mode and FDD mode. In TDD mode, the power amplifier used by the base station not only needs to output high power, but also must not damage the function of the low-noise receiving circuit. In engineering applications, in order to realize the remoteness of WLAN signals, it is necessary to perform power amplification on the uplink and downlink signals respectively. At present, the dual-port structure with single input and single output is mainly used in the market. If it is to be applied in a signal transmission system with separate uplink and downlink, an additional module is required to combine the two signals into one, which is inconvenient for construction and high in engineering costs. [0...

AI Technical Summary

Problems solved by technology

The former circuit is simple, but due to the power limitation of the semiconductor module, it can only output a small linear power, which cannot meet the high output power requirements of the base station amplifier; the ferrite circulator used in the latter makes the high output power directly connected to the transmitting antenna. High reliability, good linearity index, and large power capacity, but due to its limited isolation, the low-noise amplifier is directly connected to the circulator, which will cause damage to the low-noise amplifier

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