A vector modulation phase shifter for reconfigurable antenna array beamforming

Abstract

The invention relates to a vector modulation phase shifter for reconfigurable antenna array beamforming, comprising: an input balun for converting a single-ended input signal into a differential inputsignal; an orthogonal signal generator, wherein the differential input signal passes through the orthogonal signal generator to generate two paths of orthogonal differential signals, namely an I-pathsignal and a Q-path signal; a variable gain amplifier comprising an I-path variable gain amplifier used for carrying out amplitude modulation and vector synthesis on the I-path signal, and a Q-path variable gain amplifier used for carrying out amplitude modulation and vector synthesis on the Q-path signal; and an output balun used for converting the differential signal into a single-ended signaland outputting the single-ended signal. The variable gain amplifier is suitable for the SiGe BiCMOS process, the balun of a transformer structure is adopted, phase and amplitude imbalance is reduced,the bandwidth of orthogonal signals is widened through the low-coupling-coefficient quadrature coupler, and the amplitude control precision is improved through the variable gain amplifier achieved bycontrolling bias currents combined with the Gilbert cell.

Description

technical field [0001] The invention relates to the technical field of active phase shifters, in particular to a vector modulation phase shifter for reconfigurable antenna array beamforming. Background technique [0002] In recent years, reconfigurable antenna arrays have been developed rapidly. The phase shifter is a key module in the phased array system, which realizes beamforming and scanning by controlling the phase of the signal transmitted by each antenna element in the antenna array. With the continuous increase of the operating frequency and the continuous increase of the scanning angle range, the distance between the elements of the phased array antenna must become smaller and smaller. Amplitude and phase modulation have high precision requirements, so phased array antennas have higher and higher requirements on the phase modulation performance of the transceiver component TR, and the size requirements of the transceiver component are also smaller and smaller. Usi...

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Problems solved by technology

Polyphase filter PPF can produce high-quality quadrature signals, but the insertion loss is large

The quadrature all-pass filter QAF has the advantage of small insertion loss and can even provide a certain voltage gain. However, in the mmWave frequency band, its load capacitance can be compared with the internal QAF capacitor, which will lead to significant I / Q error

And the accuracy of the amplitude modulation unit in the previous active phase shifter system is low

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