Active Amplitude and Phase Control Circuit

Abstract

The invention discloses an active amplitude and phase control circuit, comprising a quadrature generator, a phase shift and amplitude modulation unit, an amplitude control DAC and a phase control DAC; it is characterized in that: the phase shift and amplitude modulation unit includes a phase shift unit and an amplitude modulation unit; the amplitude control DAC includes An amplitude control circuit and a first decoder, the phase control DAC includes a phase control circuit and a second decoder; the amplitude control circuit is used to amplify and switch the first reference current, convert it into a two-way current signal, and then use the The two-way current signal is converted into a two-way voltage control signal and output to the amplitude modulation unit; the phase control circuit is used to amplify and switch the second reference current, convert it into a two-way current signal, and then convert the two-way current signal into a four-way current signal The voltage control signal is output to the phase-shifting unit; the phase-shifting unit is used to amplify the four-way quadrature signals output by the quadrature generator, and then synthesize them into two-way differential signals and output them to the amplitude modulation unit to realize 360-degree phase shifting.

Description

technical field [0001] The invention relates to amplitude and phase control, in particular to an active amplitude and phase control circuit. Background technique [0002] The amplitude and phase control circuit is a key component mainly used in electronic communication systems such as electronic countermeasure radar, digital mobile communication, microwave millimeter wave communication, etc. Its function is to control the amplitude and phase of the input signal to a certain value and then output , the schematic diagram of its application in phased array radar is as follows figure 1 As shown; the multifunctional circuit is mainly divided into passive structure and active structure. Among them, the passive amplitude and phase control multifunctional circuit has the advantages of high linearity and low power consumption, but the area of ​​the passive amplitude and phase control multifunctional circuit is relatively large. And it cannot be applied in broadband; the active ampli...

AI Technical Summary

Problems solved by technology

The amplitude control of this scheme can only be realized by controlling the total current. The linearity of this control method deteriorates rapidly under low gain conditions, and the change of current will cause the active inductance to change, thus causing the bandwidth to change under different gains.

Moreover, the existing amplitude-phase control multifunctional circuits all use two-stage circuits in series to realize amplitude and phase control; one stage realizes amplitude control, and the other stage realizes phase control; but this kind of series connection will lose linearity to a certain extent or noise figure

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