UWB (ultra wide band) two-phase shifter

Abstract

The invention discloses a UWB (ultra wide band) two-phase shifter. The two-phase shifter comprises an active balun, a first differential amplifier, a second differential amplifier, a third differential amplifier, a switch matrix, an RC orthogonal network and a single-pole double-throw switch, wherein the active balun receives a single-ended signal, and converts the single-ended signal into double-ended signals which are connected to two input ends of the first differential amplifier respectively; the first differential amplifier performs waveform shaping and gain compensation on the received two paths of signals, and selects different branches through a switch matrix to realize 180-degree phase shift; the double-end signal passes through the switch matrix and generates an orthogonal signalthrough a cascaded RC orthogonal network, and the rear stage of the RC orthogonal network is cascaded with the second differential amplifier and the third differential amplifier respectively; the single-pole double-throw switch selects different branches of the second differential amplifier and the third differential amplifier to generate 90-degree phase shift stepping quantity, so 90-degree phase shift quantity, 180-degree phase shift quantity and 270-degree phase shift quantity are realized. The phase shifter has the advantages of ultra-wide band, high phase shifting precision, good amplitude balance, simple control mode and high integration level.

Description

technical field [0001] The invention belongs to the radio frequency microwave integrated circuit technology of microelectronics and solid electronics, in particular to an ultra-wideband two-phase shifter. Background technique [0002] The phase shifter is a key component in the modern antenna phased array and microwave communication system. It is used to control the phase change of the microwave signal, thereby controlling the beam scanning of the antenna, and realizing the search and tracking of the target. The size, phase shifting accuracy, cost, operating temperature, and mass production capacity of the phase shifter are all directly related to the performance of the entire phased array radar, and its bandwidth represents the overall bandwidth bottleneck of the transceiver system. [0003] At present, monolithic integrated phase shifter circuits mainly include transmission line type, reflection type and all-pass network type based on magnetic coupling. The transmission l...

AI Technical Summary

Problems solved by technology

The transmission line phase shifter usually has a narrow operating bandwidth. In order to expand the bandwidth, a multi-stage series connection is generally used, which will increase the area of ​​the circuit and increase the loss of the circuit, and the bandwidth is difficult to reach 9 octaves.

The reflective phase shifter can expand the bandwidth, but it is limited by the quarter-wavelength line, and the circuit area is relatively large, which is not conducive to chip miniaturization

Although the working bandwidth of the all-pass network phase shifter based on magnetic coupling can reach multiple octaves, the amount of phase shift achieved is limited

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