A key issue in the design of the highly integrated front-end circuit of a portable Veterinary Ultrasound diagnostic instrument is the integration of the circuit board, that is, whether the size of the circuit board can be effectively and reasonably controlled, coordinated with the back-end circuit board, and at the same time not affect the overall performance of the veterinary ultrasound system. To solve the problem of high integration of the front-end circuit, the layout and wiring design of the printed circuit board (PCB) is crucial. The quality of PCB design directly affects the overall performance of the veterinary ultrasound circuit.

There are many factors to consider in determining the stacking structure of the PCB board in the veterinary B-ultrasound system. From the perspective of wiring, the more layers, the more conducive to wiring, but at the same time, the cost and difficulty of board making will also be greatly increased; from the perspective of production, whether the stacking structure in the veterinary B-ultrasound is symmetrical is the focus of attention when manufacturing the PCB board. Therefore, the determination of the number of layers needs to consider many factors to achieve the best balance.

On the basis of completing the pre-layout of components, focus on analyzing the locations where wiring bottlenecks may occur. Considering that there are many signal lines with special requirements on the veterinary B-ultrasound board, such as differential lines and signal lines that are very sensitive to noise; and there are many FPGA pins and complex wiring; at the same time, there are many types of power supplies, and the requirements for isolation and anti-interference are high. Taking all the above factors into consideration, while ensuring that the veterinary B-ultrasound wiring can be completed smoothly and the signal quality is guaranteed, a 10-layer board is generally used for design.

After determining the number of layers of the circuit board, the next thing to do is to determine the placement order of the circuits on each layer. Since the veterinary B-ultrasound circuit board has many layers, there are many types of permutations and combinations of the ground layer, power layer, and signal layer, and there are many factors that need to be considered.