On the net many about the hardware circuit experience, the knowledge lets the human dazzle. Things like signal integrity, EMI, and PS are designed to confuse you. Take your time, everything.
I would like to discuss with you some of their own about the hardware circuit design experience, to “throw diversion jade”, dedicated to those who have just started or will start to design hardware circuits, let you in the “hardware circuit design” this road less “detours”.
1. General idea
To design hardware circuits, the big framework and architecture to figure out, but to do this is not easy. Some big frame perhaps own boss, the teacher has already thought, oneself are only the train of thought concrete realization;
But some have to design their own framework, it is necessary to figure out what to achieve, and then look for a reference circuit board can achieve the same or similar function (to know how to use the results of others, the more experienced engineers will know how to use the results of others).
If you find a reference design, congratulations, you can save a lot of time (both pre-design and post-debugging). Copy immediately? On the one hand, it can improve our circuit understanding ability and avoid mistakes in the design.
3. No reference design found?
First, determine the big IC chip, look for Datasheet, and see whether its key parameters meet their requirements, which are the key parameters they need, and whether they can understand these key parameters are the embodiment of the ability of hardware engineers, which also needs to be accumulated slowly for a long time. During this period, be good at asking questions, because they do not understand the things, others often a word can remind you, especially the hardware design.
4. Three main design parts of the hardware circuit
Schematic diagram, PCB, BOM.
Schematic design is to convert the previous ideas into circuit schematic. It looks a lot like the circuit diagram in our textbook. PCB refers to the actual circuit board, it is based on the schematic diagram of the network table (network table is to communicate between the schematic diagram and PCB bridge), and the specific components of the package placement (layout) on the circuit board, and then according to the fly wire (also known as pre-tension wire) to connect its electrical signals (wiring).
After completing the PCB layout and wiring, the components to be used should be summarized, so we will use the BOM table.
What tools should I use?
Prote, also known as altium, is easy to get into and popular at home. It is enough to cope with general work and is suitable for designers who are just getting started. In fact, whether using simple protel or complex cadence tools, the hardware design is the same.
(the operation on protel is similar to windwos, and post-command type; Concept & allegro, a product of cadence, is pre-command type. If you are used to protel and suddenly turn to cadence’s tool, you will not be used to it. This is the reason.)
Major links of design should include:
1) schematic design.
2) PCB design.
3) make BOM table.