when the voltage goes below the ground level temporarily, the current flows from ground terminal through D1 to the input? This way current wouldn't flow through Q1 transistor. You can see here four circuits and all of them look different from each other considering the layout of components but function-wise they are pretty much the same in the context of given circuit.Ĭircuit #1 and #2 were taken from this webpage.ĭoes this mean that when there is a negative spike at the input, i.e.
The totem-pole circuit also does the same thing, in my opinion, making the output low or high but its use is mostly restricted to turning on/off of FET transistors. Such a combination is used to pull the output voltage toward ground or toward the supply voltage in other words low and high. It is my understanding that when the word pull-up/pull-down is used, it refers to combination of a resistor and switch such as this one.
I believe that the words pull-up/pull-up network and push-pull network are synonymous in the context of circuits. Could you please help me with the queries below? Thank you.
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