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Published on 2018-12-26 09:02
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Lead and Lag Oscillators [Copy link]
This post is from Analog electronics
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In fact, to figure out the first question you raised in this post, it is far from enough to rely on the little bit at the beginning of the analog circuit textbook. To figure it out thoroughly, you need knowledge of "solid state physics" and "quantum mechanics". Moreover, figuring out these problems is of little use to electronic engineers.
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Published on 2019-1-21 20:02
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Published on 2018-12-26 09:20
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This post is from Analog electronics
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Published on 2018-12-26 09:23
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This post is from Analog electronics
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Teacher, I saw this post again and I really want to know how the frequency fo is calculated. I used to see 1/2π square root RC, which is the same as the fo in the first post, but with the square root 6 as a constant. I want to know how it is calculated. My math knowledge is just average, I have studied advanced calculus.
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Published on 2019-1-17 16:17
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This post is from Analog electronics
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In fact, we only need to write out the transfer function of the three RC circuits (note that the three resistors are equal and the three capacitors are also equal) and solve for the frequency of the 180-degree phase shift.
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Published on 2019-1-17 18:31
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Published on 2019-1-17 18:27
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This post is from Analog electronics
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Published on 2019-1-17 18:31
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This post is from Analog electronics
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Thank you, teacher. This is indeed a long post. I have a few random questions, so I will ask you directly in the post. [1] If a circuit has good "switching characteristics" under a certain operating state, does the switching characteristic refer to low switching loss, "zero voltage turn-on, zero current turn-off" and other characteristics? [2] What is the reverse recovery of the diode?
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Published on 2019-1-21 10:35
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This post is from Analog electronics
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Does the circuit have good "switching characteristics"? Does the switching characteristics refer to small switching losses and "zero voltage turn-on, zero current turn-off"? Good switching characteristics mean that the current is very small when turning off, the resistance is very small when turning on, the delay time is short, and the current rise and fall edges are steep.
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Published on 2019-1-21 10:59
Does the circuit have good "switching characteristics"? Does the switching characteristics refer to small switching losses and "zero voltage turn-on, zero current turn-off"? Good switching characteristics mean that the current is very small when turning off, the resistance is very small when turning on, the delay time is short, and the current rise and fall edges are steep.
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Published on 2019-1-21 10:58
Does the circuit have good "switching characteristics"? Does the switching characteristics refer to small switching losses and "zero voltage turn-on, zero current turn-off"? Good switching characteristics mean that the current is very small when turning off, the resistance is very small when turning on, the delay time is short, and the current rise and fall edges are steep.
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Published on 2019-1-21 10:52
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Published on 2019-1-21 10:52
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This post is from Analog electronics
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Published on 2019-1-21 10:58
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This post is from Analog electronics
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Published on 2019-1-21 10:59
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This post is from Analog electronics
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This post is from Analog electronics
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This post is from Analog electronics
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Why does a sudden reverse voltage cause a large current to flow through the diode like a short circuit? The usual explanation is that when a forward current flows through the diode, a large number of majority carriers are stored in the PN junction space charge region (depletion layer). When a reverse voltage is suddenly applied, these majority carriers do not have time to recombine, causing a large current to flow through the diode instantly until
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Published on 2019-1-21 12:13
Why does a sudden reverse voltage cause a large current to flow through the diode like a short circuit? The usual explanation is that when a forward current flows through the diode, a large number of majority carriers are stored in the PN junction space charge region (depletion layer). When a reverse voltage is suddenly applied, these majority carriers do not have time to recombine, causing a large current to flow through the diode instantly until
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Published on 2019-1-21 12:11
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Published on 2019-1-21 11:56
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This post is from Analog electronics
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14
Published on 2019-1-21 12:11
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This post is from Analog electronics
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Teacher, in response to this question, I looked back at the materials and understood that in many figures, the area with a slash is the PN junction. The circle on the right is the hole that penetrates from the P semiconductor. The black dot on the left is the internal electric field formed by the free electrons that penetrate from the N semiconductor, which hinders the continued penetration on both sides. [1] P
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Published on 2019-1-21 16:52
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Published on 2019-1-21 12:13
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This post is from Analog electronics
Comments
Thank you, teacher. Regarding the third question, what determines whether the flyback converter works in the discontinuous current mode or the continuous current mode? It is determined by three factors: the primary inductance of the flyback converter transformer, the switch on time and the load current. There is a post in the forum explaining this.
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Published on 2019-1-21 15:10
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This post is from Analog electronics
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"Is there any post in the forum explaining this?" It seems not. But there are a lot of materials explaining this matter. Almost all books on switching power supplies will talk about it. You can download it and take a look.
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Published on 2019-1-21 16:20
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Published on 2019-1-21 15:29
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This post is from Analog electronics
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This post is from Analog electronics
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Published on 2019-1-21 16:20
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This post is from Analog electronics
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This post is from Analog electronics
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Start from Section 2.2 “Formation and Characteristics of PN Junction” on page 31.
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Published on 2019-1-21 20:02
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