7-bit high-precision broadband active phase shifter for radio frequency/millimeter wave frequency band and application

Abstract

The invention discloses a seven-bit high-precision broadband active phase shifter for a radio frequency / millimeter wave frequency band, which is characterized in that a single-ended signal output by apreceding-stage circuit is converted into a differential signal through a single-ended to differential passive balun, and four paths of I / Q orthogonal signals are generated through a second-order multiphase filter of an RC orthogonal network; providing gain for the generated four paths of I / Q orthogonal signals through the corresponding Gilbert units and realizing vector synthesis of the orthogonal signals; the synthesized signal is converted into a single-ended signal through the active balun, and the single-ended signal is amplified and output through the phase fine adjustment VGA; a vectorsynthesis quadrant is selected through a quadrant selection switch by adopting high two bits of a seven-bit digital control code, vector synthesis is realized by controlling the current magnitudes oftwo Gilbert units through a numerical control current array in the middle four bits, and phase fine adjustment is realized by controlling a switched capacitor in a VGA at the lowest bit. The invention has the advantages of simple circuit, low power consumption and small area, and can meet the beam scanning requirement of the phased array system.

Description

technical field [0001] The invention belongs to the technical field of radio frequency integrated circuits, and in particular relates to a 7-bit high-precision broadband active phase shifter for radio frequency / millimeter wave frequency band, which is applied to the circuit design of the high-precision active phase shifter. Background technique [0002] The phase shifter is one of the most important modules in the phased array system, and it is widely used in the field of RF / millimeter wave. The phase shifter is used to control the beamforming, which can make the zero point of the phased array array pattern have strong anti-interference, so as to ensure that the received useful signal is not interfered. If the phase shift error of the phase shifter is too large, the phased array system cannot achieve a more accurate beam pointing angle, which reduces the signal-to-noise ratio and increases the system's requirements for the dynamic range of the mixer and post-processing modul...

AI Technical Summary

Problems solved by technology

Phase synthesis is carried out by controlling the magnitude of the I / Q tail current. In order to achieve higher precision phase shifting, the design needs to use a higher resolution current array. Due to the well proximity effect (well proximity effect, WPE) and the oxide layer The effect of length of oxide diffusion (LOD) is difficult to meet the requirements of high-precision current ratio, so this design will cause a large RMS phase error

[0004] Passive phase shifters are facing technical bottlenecks due to their low precision and large size, while traditional active phase shifters cannot meet relatively uniform phase shift steps while shifting with high precision, which will affect the phased array system. performance

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