An Active Switch Structure for Millimeter Wave Phased Array Systems

Abstract

The invention discloses an active switch structure suitable for a millimeter wave phased array system. The active switch circuit is composed of an input cascade type common-gate amplifier in a transmitting mode, an output common-drain amplifier in a receiving mode and two stages of common-source common-gate amplifiers in a transmitting channel and a receiving channel. By controlling the bias voltage of the cascade common-gate amplifier and the common-drain amplifier, the circuit can realize the switching between the transmitting state and the receiving state. In a transmitting state, the cascade type common-gate amplifier structure can improve the gain and the reverse isolation of the circuit and reduce the power consumption. In the receiving state, the source electrode of the common-drain-stage amplifier is connected with the capacitor in parallel, and the grid electrode of the common-drain-stage amplifier is connected with the resistor in parallel, so that the impedance characteristic of the circuit is consistent with the transmitting state under unconditional stability. Meanwhile, the two stages of cascode amplifiers of the transmitting channel and the receiving channel respectively improve the gain and the output power of the transmitting channel and the receiving channel of the phased array system. The active switch structure has the advantages of high isolation, low return loss and excellent gain.

Description

technical field [0001] The invention relates to the technical field of electronic circuit design, in particular to a transmitting and receiving switch circuit in a millimeter wave phased array system, and in particular to an active switch circuit suitable for a millimeter wave communication system. Background technique [0002] In recent years, wireless communication technology has developed rapidly, especially millimeter wave communication technology. Among them, the Ka band in the millimeter wave frequency band, that is, the 26.5-40GHz frequency band, has gradually become an important frequency band for future 5G mobile communication networks and high-speed satellite communications. The millimeter wave phased array system plays an important role in 5G mobile communications due to its fast transmission rate, low delay, and high reliability. The phased array system includes a lot of independent antenna arrays, each array has a transmitting / receiving unit, and each antenna u...

AI Technical Summary

Problems solved by technology

However, the traditional active switch circuit is relatively complex, its structure is asymmetrical, and its performance is difficult to meet the high isolation and low return loss switch design requirements in millimeter wave phased array applications.

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