[Answers to Objective Questions of the 14th Blue Bridge Cup EDA Provincial Competition]

Answers to the objective questions of the 14th Blue Bridge Cup EDA Provincial Competition

insert image description here
This question examines the function of the chip. According to the device given in the schematic diagram, it is as follows:

After Baidu, the common function of ULN2003 is to drive the array with high current. It is speculated that the answer is D, which provides a higher driving current.

insert image description here
The second question examines the knowledge of analog electronics, which is applicable to linear circuits, and choose B.

insert image description here
The third question examines the content of the DRC inspection. In the DRC inspection configuration of the PCB, you can find the three items of ABC. In the live broadcast analysis, item D is mentioned. Let’s assume that the answer is ABCD.

insert image description here
In the live broadcast analysis of the fourth question, it is mentioned that the answer is AC.

The fifth question examines the knowledge of capacitors. X5R and X7R are small capacitors in SMD packages, without polarity, and mica capacitors have no polarity. Choose the BCD item.
insert image description here
The sixth question is simple, the difference is the unified clock signal, choose option D.

The seventh question uses the reference voltage to calculate, use $2.4/2^8$ , the answer is approximately equal to item D, choose D.

insert image description here

The eighth question examines the relationship between the power supply and the load to achieve the maximum power, and the answer is option B.
insert image description here
The ninth question examines the impedance impression factor of PCB wiring, and choosing ABCD will have an impact.

insert image description here
The tenth question examines the precautions for PCB layout of high-speed circuits. The signal layer can be covered with copper. If the other options are correct, choose ABD.

Tucao plus a PCB with the last random wiring

The PCB design topic is less difficult in terms of schematic diagram design, and there is no investigation to design the circuit diagram according to the device manual. However, the difficulty in PCB drawing has increased a lot. Two schematic diagrams are drawn in a small board, and there are many devices. If the pre-layout is not good enough, the wiring may not be able to go at the end.
insert image description here

Awards

The correct answer is multiple choice questions, 6 right and 4 wrong, and the design questions are basically clear, and won the first prize in the Hubei Provincial Competition Area.
insert image description here