Portable ultrasonic imaging system receiving front-end device

Abstract

The invention provides a portable ultrasonic imaging system receiving front-end device which is used for receiving and processing echo signals input by an ultrasonic transducer. The portable ultrasonic imaging system receiving front-end device is characterized by comprising sending and receiving isolated gate circuits which are connected in series sequentially, a front-end analog chip and a field programmable gata array (FPGA) main control unit. Optimized diode bridge circuits are adopted in the sending and receiving isolated gate circuits and the sending and receiving isolated gate circuits are controlled by the FPGA main control unit, each optimized sending and receiving isolated diode bridge circuit is connected with a transducer array element directly, wherein the optimized diode bridge circuits are provided with two inductances which are in a serial connection with the direct circuit bias access, and the specific circuit is characterized in that one ends, connected with the diode bridge, of a first bias resistance (R1) and a second bias resistance (R2) of the diode bridge circuit are respectively serially connected with a first inductance (L1) and a second inductance (L2), wherein the ranges of the first inductance and the second inductance are from several microhenries to hundreds of microhenries, and the portable ultrasonic imaging system receiving front-end device is powered by a single power supply.

Description

technical field [0001] The invention relates to the technical field of ultrasonic imaging, in particular to a receiving front-end device of a portable ultrasonic imaging system. Background technique [0002] The receiving front-end device of the ultrasonic imaging system in the prior art such as figure 1 As shown, the echo signals received by dozens or even hundreds of ultrasonic transducers need to be amplified and compensated for analog-to-digital conversion, and the collected multi-channel data should be sent to the back-end processor Data storage and post-processing. Each echo path in a traditional ultrasound imaging system needs to use multiple amplifier chips and a high-speed A / D chip with parallel output to amplify and sample the echo signal. Such an ultrasound imaging system that can meet medical needs requires a large number of amplifier chips and A / D chips to realize, and will form hundreds of digital interfaces, which will lead to many components used in the sys...

AI Technical Summary

Problems solved by technology

The introduction of high-voltage switches in the echo path will increase the insertion loss of the echo signal and increase the harmonic distortion

[0004] On the other hand, the prior art transceiver isolation diode bridge circuit such as figure 2 As shown, in order to ensure that it can work in the linear region of the diode, a larger DC bias current is often selected, that is, smaller bias resistors R1 and R2 are selected, but this will increase the static power consumption of the bias circuit, and at the same time When receiving the echo, since the bias resistor is connected in parallel to the receiving circuit, a smaller bias resistor will lose more echo signals

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