investing input transistor symbol
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Investing input transistor symbol

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Another bipolar logic family, called ECL or emitter-coupled logic, offered a higher-performance option for speed-critical designs. It was notoriously power-hungry, used weird power supplies and differential signals. There are no binary inputs. There are voltages and currents. Sometimes we decide that a certain voltage or current means 1 and a certain voltage or current means 0.

But that's our decision. That's not physics. This sets the output to positive voltage "by default". If there's any path between the output and the ground, then all current from the positive supply through the resistor goes to ground through the MOSFETs and does not develop any "back pressure" i. If there is no such path, then the "back pressure" develops and the voltage after the resistor is the same as the voltage of the power supply. The point is, the way the gate works is an interplay of voltage and current and resistance.

The inputs are voltages and the output is a voltage, but in the middle it's a tangle of different stuff. If we decide that a high voltage is a 1, that definition doesn't work on a part of the circuit where there is current flowing or not flowing, or a high or low resistance through a MOSFET. You can say that a flowing current means a That is why we talk about whole gates, which have outputs and inputs that are all the same kind of thing, and it doesn't make sense to talk about cutting a gate in half and connecting half of it to another gate.

Sure, you can design new gates based on mixing and matching parts of other gates, but the whole thing should be treated as one gate. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge. Create a free Team Why Teams? Learn more.

Transistors collector input output of other transistor? Ask Question. Asked 9 months ago. Modified 6 months ago. Viewed times. Timeless Timeless. The problem of your approach is it kind of ignores the fact that transistors have certain voltage and current conditions to operate. A collector isn't "an always-on current", and in many logic families like CMOS, it is voltages, not currents, that indicate logic levels.

Do you understand what voltage and current are? Add a comment. Sorted by: Reset to default. Highest score default Date modified newest first Date created oldest first. Example - NAND Gate 2 switches in series, simulate it here : All four of these work the same way, using a pair of switches wired in series that pulls down the output to GND when both inputs are HIGH: Relay - both coils on close two switches in series to pull the output down.

Transistor - both NPNs are on, pulling the output down. One or both pFETs pull up otherwise. Continuing, NOR gates work the same way, but with switches wired in parallel on the pull-down side simulate it here : In both cases, CMOS is set apart from the others in that it uses an active pull-up , that exploits the opposite control polarity of the pFET gate to form a complementary switch to the nFETs on the low side. Just a few remarks: However, relays and BJT are voltage controlled because we need both input and output voltage to cascade gates.

For this purpose, we artificially insert resistance into their input circuit winding the coil with a thin copper wire and connecting a base resistor to the transistor. In the latter case, they should overlap. The gates shown are all buffer types with one unit load inputs. OP is hinting at passing a signal through a BJT like you would a relay. Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Most transistors are made from very pure silicon or germanium, but certain other semiconductor materials can also be used. A transistor may have only one kind of charge carrier, in a field effect transistor, or may have two kinds of charge carriers in bipolar junction transistor devices.

Compared with the vacuum tube, transistors are generally smaller, and require less power to operate. Certain vacuum tubes have advantages over transistors at very high operating frequencies or high operating voltages. Many types of transistors are made to standardized specifications by multiple manufacturers.

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Figure 4: Schematic Symbols for each type of transistor. The investments that AT&T made hiring top scientists over the years made them. A transistor is a semiconductor device that transfers a weak signal from a low resistance region to a high resistance region. The actions of NPN and PNP. Learn about Transistor Characteristics like Input, Output, Current carrying characteristic, for Common emitter, common base, and common collector.