Phased array receiver pre-differential amplifier circuit, phased array system

Abstract

The invention belongs to the technical field of electronics, and particularly relates to a phased array receiver front subtraction amplification circuit. The circuit is used for solving the problem ofhigh reactive power consumption of an existing phased array. The circuit adopted by the invention comprises a transformer, a diode, a capacitor and a low-noise operational amplifier; during transmission, a receiver circuit does not work, and is clamped by the diode through the capacitor, and a clamping voltage is converted into a secondary stage through the transformer; during receiving, two small signals of a phased array transducer are added to the primary side of the transformer through the capacitor, the transformer amplifies the two small signals for the first time, DC interference is filtered out, the amplitude of a low-frequency interference signal is greatly attenuated, the secondary voltage of the transformer is directly connected with the forward input end of the low-noise operational amplifier, and the low-noise operational amplifier carries out subtraction on the two input voltage signals and then carries out secondary amplification. The circuit is simple, the work is stable, the reactive power consumption of the receiver side during transmission can be effectively reduced, the loss is not influenced by the transformation ratio of the transformer, and the size of the transformer can be reduced; and in addition, the voltage conversion efficiency during receiving can be improved.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a receiver pre-differential amplifier circuit for two-way common-ground signals of a phased array transducer. Background technique [0002] A phased array transducer is a planar transducer composed of many array elements. These array elements are connected in a specific way to form a two-dimensional sub-array, forming four sub-arrays X1, X2, X3, X4 in the X-axis direction, and forming four sub-arrays Y1, Y2, Y3, Y4 in the Y-axis direction. The phased array receiving circuit receives signals from eight sub-arrays, and finally forms four wave speeds. Such as figure 1 and figure 2 As shown, the phased array transducer is a combined transceiver, and the phased array transmitter and phased array receiver work in time-sharing. At present, most phased array receiver preamplifier circuits use the transducer signal to directly connect to the transformer, and then conn...

AI Technical Summary

Problems solved by technology

At present, most phased array receiver preamplifier circuits use the transducer signal to directly connect to the transformer, and then connect the capacitor in series on the secondary side of the transformer to reduce the influence of the transmission voltage. This has the following problems. First, in the phased array transmission When the transmitter is working, the receiver transformer bears high voltage and power consumption. Second, when the transformation ratio n of the transformer is greater than 1, the reactive power consumed by the receiver preamplifier circuit increases sharply.

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