Shulou(Shulou.com)06/02 Report--

Today, I will talk to you about how to use orCAD to set compatible circuits in Cadence. Many people may not know much about it. In order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

As far as "schematic design" is concerned, its essence is "abstract description of design ideas", which involves three key points:

I), "device symbol": the representation of the device in the schematic diagram

Ii), "device selection": device selection

Iii), "device packaging": PCB packaging of devices

However, at the beginning of the design, the "circuit function" is not single, in order to speed up the progress of development, it is often necessary to do partially compatible design. There are two reasons:

I) at the beginning of the design, the function is uncertain, and Party A will put forward the functional requirements, but if the cost-down and update of the resumed session do not provide corresponding design interfaces, it will greatly increase the difficulty of this part and increase the progress of subsequent development.

Ii), the function realization, advantages and disadvantages of the same type of devices can only be determined by the actual circuit test, if there is no compatible design, it is likely to cause the lack of a certain material, resulting in the lag of research and development.

Iii), compatible design, can realize the measurement of many kinds of IC and circuits on the same PCB board, and greatly reduce the times of plate making and the cycle of research and development.

1. Reservation circuit method

For "circuit design", it is recommended that the method of controlling "reserved circuit" is "bom control", that is, "reserved circuit control" is realized by controlling "BOM". In most cases, it is realized by "setting DNP" or "zero ohmic resistance", as shown in the following figure:

Note: the above circuit is only an example, not mandatory; the above circuit can achieve simple current expansion in low-end situations, but this practice is not recommended in middle and high-end situations.

As shown above, the resistors "R6" and "R31" are set to "DNP attribute". When the "BOM table" is issued later, it can be deleted to achieve the purpose of "BOM control", and the final "SMT" will not patch this tag device.

Later, if you need to test the "reservation circuit" function, you only need to "manually weld the reservation circuit device".

The final PCB is as follows:

After reading the above, do you have any further understanding of how to use orCAD to set compatible circuits in Cadence? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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