Broadband high-precision active phase shifter

A high-precision, phase shifter technology, applied in the direction of phase shifting network, multi-terminal pair network, etc., can solve the problems of phase shifting accuracy decline, VGA gain deviation from expected value, difficult to design phase shifter, etc., to achieve noise figure suppression Effect

Active Publication Date: 2017-09-01
FUDAN UNIV
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AI Technical Summary

Problems solved by technology

The usual phase shifter mostly adjusts the quadrature signal amplitude by controlling the bias current of the VGA. The disadvantage of this structure is that when the precision of the phase shifter is high, a bias current with a very large variation range is required. On the one hand, it is difficult to accurately generate a bias current with such a large variation range

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  • Broadband high-precision active phase shifter
  • Broadband high-precision active phase shifter
  • Broadband high-precision active phase shifter

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Embodiment Construction

[0018] as attached figure 1 Shown is the specific structure of the broadband high-precision phase shifter of the present invention. The full differential signal entering the phase shifter is first converted into quadrature differential four-way signals by the three-stage PPF of the quadrature signal generator, and their amplitudes are equal, but the phases are sequentially different by 90 degrees.

[0019] These four quadrature differential signals are then fed into the quadrant selector switch (attached image 3 ), M1~M2 in the figure are common source amplifier tubes, their drains are connected to the sources of switching tubes M3~M6, and the drains of M3~M6 are connected to loads R1~R2 and L1. The signal is first amplified through the common source amplifier tube, and then the polarity of the signal can be determined through the switch tubes M3~M6, so as to determine which quadrant the final synthesized signal is located in. Because the signal sent to the VGA can only be ...

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Abstract

The invention belongs to the field of design of radio-frequency microwave integrated circuits, and in particular relates to a broadband high-precision active phase shifter. The phase shifter mainly comprises an orthogonal signal generator, a quadrant selection switch, a VGA and an output BUFFER. The phase shifter disclosed by the invention does not adopt the traditional orthogonal signal amplitude adjusting method, namely control of the signal amplitude by change of bias current; but, the phase shifter disclosed by the invention adopts a method for synthesizing the needed amplitude by controlling a series of sub-gain units through a switch; therefore, the problem that the phase shifting accuracy is decreased due to the fact that the linearity of a MOS transistor in the traditional phase shifter is limited can be solved; simultaneously, design of a complex high-bit DAC also can be avoided; in addition, the quadrant selection switch of the phase shifter also has the amplification function, and has the inhibiting effect on a noise coefficient; the load of the common-source amplifier in the output BUFFER of the phase shifter is adjustable; and thus, the in-band flatness of signals can be adjusted.

Description

technical field [0001] The invention belongs to the field of radio-frequency microwave integrated circuit design, and in particular relates to a broadband high-precision phase shifter used in a multifunctional transceiver assembly, which can be used in related phased array systems such as wireless communication, radar detection, and electronic countermeasures. Background technique [0002] As the core component of the active phased array system, the broadband active phase shifter has a decisive impact on the performance of the active phased array system. Its index directly determines the technical standard of the phased array system, and its weight and volume directly Affecting the miniaturization of the phased array system, its reliability and cost determine the application prospect of the phased array system. Due to the large number of phase shifters equipped in a phased array system, we should reduce the volume and weight of its components as much as possible and control ...

Claims

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Application Information

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IPC IPC(8): H03H11/16
CPCH03H11/16
Inventor 李巍胡金涛
Owner FUDAN UNIV
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