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  https://wodewangzhishime.blogspot.com/2022/07/cai-yourong-spy.html . Ref: https://wodewangzhishime.blogspot.com/2022/06/httpswodewangzhishime_11.html . . . John: You may take a look at this article first (  https://wodewangzhishime.blogspot.com/2022/05/httpswodewangzhishime_18.html ). Me: OK. John: And then, there're 2 pictures above. Which one is correct. Me: The 2nd picture is correct. John: You're wrong. The 1st picture is correct. Let me explain to you. . Note: In the 1st picture, there's a circuit A. In circuit A, the frequency is strange and unbalance. The left-side branch is 90Mhz. However, the right-side branch is 100Mhz. . John: Because, the right-side branch is 100Mhz. As a result, circuit B is induced a electrical current of 100Mhz. And then, it is horrible. Me: Why? John: Read the followings. . 1) The resonance frequency of circuit A is 80Mhz. (fc = 80) <---- fc stand for central frequency. 2) The resonance frequency of cirucit B is 100Mhz. (fc + deviation...

  https://wodewangzhishime.blogspot.com/2022/06/what-does-he-need.html . Ref:  https://wodewangzhishime.blogspot.com/2022/06/httpswodewangzhishime_70.html   . . John: Before we start, you're better read the 3 articles below. Me: OK. . 1) https://wodewangzhishime.blogspot.com/2022/02/httpswodewangzhishime_80.html 2) https://wodewangzhishime.blogspot.com/2022/02/httpswodewangzhishime_26.html 3) https://kamchihau.blogspot.com/2022/11/impact.html . John: In the monde, there're plenty protocol of communications. You might have a look .  https://instrumentationblog.com/communication-protocols/ . Me: OK. John: For example, RJ45, I2C, USB, SPI, and, so on and on. Me: OK. John: Now, we use I2C as an example. Me: OK. . John: At the picture above, do you see that there're 2 chips? They are Chip A and Chip B. Me: yes,. John: They use the interface of I2C to connect to each others. Me: OK. John: Chip A is master. Chip B is slave. That mean Chip B must use the clock line of Chip ...