﻿ how base current control collector current|ZNH

• #### Voltage or current controlled device is a BJT? And what ...

The collector current comes simply because the in-build electric field due to doping between base and collector sweeps the carriers out of the base before they can recombine.

• #### Chapter 11: The Current Mirror [Analog Devices Wiki]

A bipolar transistor can be driven by a voltage or by a current. If we consider the base emitter voltage, V BE, as the input and the collector current, I C, as the output (figure 11.3), we can think of a transistor as a non-linear voltage-to-current converter having an exponential characteristic.The base can be directly driven by the voltage output of the I-to-V converter we just discussed.

• #### Transistors why does increasing base current increase ...

The ratio of the dopant densities sets the current ratio between the base and collector (Beta). BJTs are designed with light doping in the base and a very narrow base width to maximize the diffusion of the emitter current to the collector. As a result, the base current needed to develop the Vbe for a given rate of emitter current injection is ...

• #### BJT transistor base current calculation - General ...

May 06, 2021· You can use a resistor (or something else) to control the base current, and as long as you are not in saturation, the collector current is proportional to base current (multiplied by the beta). In that case, the transistor is operating "linearly", not as a switch. You can use someting to …

• #### How does a transistor work?

The base is the gate controller device for the larger electrical supply. The collector is the larger electrical supply, and the emitter is the outlet for that supply. By sending varying levels of current from the base, the amount of current flowing through the gate from the collector may be regulated. In this way, a very small amount of current ...

• #### Transistors 101 - USD

The Base (B) is the On/Off switch for the transistor. If a current is flowing to the Base, there will be a path from the Collector (C) to the Emitter (E) where current can flow (The Switch is On.) If there is no current flowing to the Base, then no current can flow from the Collector …

• #### In a transistor, the collector current is controlled by ...

Transistor is a current controlled device. Take the case of PNP transistor During recombination Base loses its electrons. If electrons are continuously lost then Base would have become positive and it may start opposing the movement of holes from ...

• #### How to Calculate the Base Current of a Transistor

3rd Way to Calculate Base Current I B. Using Known Values If the emitter current, Ie, and the collector current, Ic, are known, IB can be calculated by the formula: Example If Ie=4ma and Ic=3.96ma, then IB calculates out to be: Related Resources. How to Calculate the Collector Current IC of a BJT Transistor

• #### Base current-control circuit of an output transistor ...

Jan 27, 1994· The present invention is directed to a base current-control circuit of an output transistor, and more specifically, one which maximizes electric power consumption efficiency. The base current-control circuit of the present invention controls a base current of the output transistor as a function of the load current of the output transistor.

• #### Current and Voltage Relationships in Bipolar Junction ...

Nov 15, 2020· The base current I B, which is limited by the base resistor R B, determines the collector current: I C = βI B. The BJT is in forward active mode because the supply voltage connected to the collector through R C is much higher than V IN, and this ensures that the base-to-collector (BC) junction is …

• #### 15. Transistor Amplifier Design and Measurement

The base current is said to control the collector current and this equation Ic = bIb is called the "transistor action" equation. You also measured the voltage between the collector and emitter Vce and graphed Ic as a function Vce. This graph is called the "load line". The graphs of the above voltages and currents characterize a particular ...

• #### Using a transistor to add to max current output from a ...

The base input then controls the current over the proportionality. So basicly a input of 1-4V on base must control the collector current also from 1-4V but allowing a larger current to flow. I read that the base-collector current must not be the same and this shuts down the transistor.

• #### How does base current increase and collector current ...

Nov 14, 2020· Hi, An increase in base current means more bias to the transistor which further means collector current will also increase but till the limiting value of the transistor parameters. However, if …

• #### How to use BJT Bipolar Junction Transistor - Beginner's ...

Oct 12, 2013· Qote: "Bipolar junctions transistors is current controlled which means a smaller current at the base controls the main current at the collector and emitter" Funny observation: A voltage of VBE=0.7V is always needed to "open" the transistor – but at the same time it is statet that the BJT would be current-controlled.

• #### Base current-control circuit of an output transistor ...

Jan 07, 1994· 1. A base current-control circuit of an output transistor (Q out) comprising: a detector (Q s) for detecting a load current of said output transistor, a base current generator (7) for generating a base current to drive the output transistor, and characterised by a current-voltage converter (2) for converting the detected current to an equivalent voltage, wherein the base current generator ...

• #### Bipolar Transistor BJT

Then, small changes in current flowing in the base will thus control the current in the emitter-collector circuit. Typically, Beta. has a value between 20 and 200 for most general purpose transistors. By combining the expressions for both . Alpha, α. and . Beta, β. the mathematical relationship between these

• #### What is the relationship between the base-emitter and ...

Generally, the current that flows from the emitter to the collector or vice versa is the base current times the DC current gain (h FE).Note, however, that h FE varies with the collector-emitter voltage (V CE).For example, Table 1 shows the h FE specification for the 2SC2712. Figure 1 shows its I C –V CE curves. When I B = 0.5 mA, the collector current (I C) is 70 mA at a V CE of 3 V (point A).

• #### BJT NPN current flow - Electrical Engineering Stack Exchange

Feb 01, 2017· That valve is controlled by the base current, which also comes out the emitter. The emitter current is therefore the base current plus the collector current. So what's the big deal? The main useful property is that the collector current the valve allows is proportional to the base current, but much larger than it.

• #### How does the IB (the base current) in a bipolar transistor ...

Ic is controlled by Ie, the emitter current. Emitter is named such because it emits electrons (npn device). The collector is so named as it collects the electrons. A scope can illustrate this. When Ie changes, Ic follows immediately as does Ib, th...

• #### Lab: Using a Transistor to Control a High Current Load ...

It has three connections, the base, the collector, and the emitter as shown in Figure 14 and Figure 15. Attach high-current load (i.e. the motor or light) to its power source, and then to the collector of the transistor. Then connect the emitter of the transistor to ground. Then to control the motor, you apply voltage to the transistor's base.

• #### Why is saturation collector current not equal to beta*base ...

The relation (collector current equal to beta*base current) is valid for for transistor where collector current is controlled by base current in a situation that base junctionis forward bias and ...

• #### UNIT-2

the maximum collector to emitter breakdown voltage that can be sustained when base current is zero and BV CBO is the collector base breakdown voltage when the emitter is open circuited. The primary breakdown shown takes place because of avalanche breakdown of collector base junction. Large power dissipation normally leads to primary breakdown.

• #### Chapter 8: Transistors [Analog Devices Wiki]

The collector emitter current can be viewed as being controlled by the base-emitter current (current control), or by the base-emitter voltage (voltage control). These views are related by the current-voltage relation of the base-emitter junction, which is just the usual exponential current-voltage curve of a PN junction (diode).

• #### Why does collector current increase with base current in …

Hello, an increase in base current means more bias to the transistor which further means collector current will also increase but till the limiting value of the transistor parameters. However, if ...

• #### Voltage or current controlled device is a BJT? And what ...

The collector current comes simply because the in-build electric field due to doping between base and collector sweeps the carriers out of the base before they can recombine.

• #### Chapter 11: The Current Mirror [Analog Devices Wiki]

A bipolar transistor can be driven by a voltage or by a current. If we consider the base emitter voltage, V BE, as the input and the collector current, I C, as the output (figure 11.3), we can think of a transistor as a non-linear voltage-to-current converter having an exponential characteristic.The base can be directly driven by the voltage output of the I-to-V converter we just discussed.

• #### Transistors why does increasing base current increase ...

The ratio of the dopant densities sets the current ratio between the base and collector (Beta). BJTs are designed with light doping in the base and a very narrow base width to maximize the diffusion of the emitter current to the collector. As a result, the base current needed to develop the Vbe for a given rate of emitter current injection is ...

• #### BJT transistor base current calculation - General ...

May 06, 2021· You can use a resistor (or something else) to control the base current, and as long as you are not in saturation, the collector current is proportional to base current (multiplied by the beta). In that case, the transistor is operating "linearly", not as a switch. You can use someting to …

• #### How does a transistor work?

The base is the gate controller device for the larger electrical supply. The collector is the larger electrical supply, and the emitter is the outlet for that supply. By sending varying levels of current from the base, the amount of current flowing through the gate from the collector may be regulated. In this way, a very small amount of current ...

• #### Transistors 101 - USD

The Base (B) is the On/Off switch for the transistor. If a current is flowing to the Base, there will be a path from the Collector (C) to the Emitter (E) where current can flow (The Switch is On.) If there is no current flowing to the Base, then no current can flow from the Collector …

• #### In a transistor, the collector current is controlled by ...

Transistor is a current controlled device. Take the case of PNP transistor During recombination Base loses its electrons. If electrons are continuously lost then Base would have become positive and it may start opposing the movement of holes from ...

• #### How to Calculate the Base Current of a Transistor

3rd Way to Calculate Base Current I B. Using Known Values If the emitter current, Ie, and the collector current, Ic, are known, IB can be calculated by the formula: Example If Ie=4ma and Ic=3.96ma, then IB calculates out to be: Related Resources. How to Calculate the Collector Current IC of a BJT Transistor

• #### Base current-control circuit of an output transistor ...

Jan 27, 1994· The present invention is directed to a base current-control circuit of an output transistor, and more specifically, one which maximizes electric power consumption efficiency. The base current-control circuit of the present invention controls a base current of the output transistor as a function of the load current of the output transistor.

• #### Current and Voltage Relationships in Bipolar Junction ...

Nov 15, 2020· The base current I B, which is limited by the base resistor R B, determines the collector current: I C = βI B. The BJT is in forward active mode because the supply voltage connected to the collector through R C is much higher than V IN, and this ensures that the base-to-collector (BC) junction is …

• #### 15. Transistor Amplifier Design and Measurement

The base current is said to control the collector current and this equation Ic = bIb is called the "transistor action" equation. You also measured the voltage between the collector and emitter Vce and graphed Ic as a function Vce. This graph is called the "load line". The graphs of the above voltages and currents characterize a particular ...

• #### Using a transistor to add to max current output from a ...

The base input then controls the current over the proportionality. So basicly a input of 1-4V on base must control the collector current also from 1-4V but allowing a larger current to flow. I read that the base-collector current must not be the same and this shuts down the transistor.

• #### How does base current increase and collector current ...

Nov 14, 2020· Hi, An increase in base current means more bias to the transistor which further means collector current will also increase but till the limiting value of the transistor parameters. However, if …

• #### How to use BJT Bipolar Junction Transistor - Beginner's ...

Oct 12, 2013· Qote: "Bipolar junctions transistors is current controlled which means a smaller current at the base controls the main current at the collector and emitter" Funny observation: A voltage of VBE=0.7V is always needed to "open" the transistor – but at the same time it is statet that the BJT would be current-controlled.

• #### Base current-control circuit of an output transistor ...

Jan 07, 1994· 1. A base current-control circuit of an output transistor (Q out) comprising: a detector (Q s) for detecting a load current of said output transistor, a base current generator (7) for generating a base current to drive the output transistor, and characterised by a current-voltage converter (2) for converting the detected current to an equivalent voltage, wherein the base current generator ...

• #### Bipolar Transistor BJT

Then, small changes in current flowing in the base will thus control the current in the emitter-collector circuit. Typically, Beta. has a value between 20 and 200 for most general purpose transistors. By combining the expressions for both . Alpha, α. and . Beta, β. the mathematical relationship between these

• #### What is the relationship between the base-emitter and ...

Generally, the current that flows from the emitter to the collector or vice versa is the base current times the DC current gain (h FE).Note, however, that h FE varies with the collector-emitter voltage (V CE).For example, Table 1 shows the h FE specification for the 2SC2712. Figure 1 shows its I C –V CE curves. When I B = 0.5 mA, the collector current (I C) is 70 mA at a V CE of 3 V (point A).

• #### BJT NPN current flow - Electrical Engineering Stack Exchange

Feb 01, 2017· That valve is controlled by the base current, which also comes out the emitter. The emitter current is therefore the base current plus the collector current. So what's the big deal? The main useful property is that the collector current the valve allows is proportional to the base current, but much larger than it.

• #### How does the IB (the base current) in a bipolar transistor ...

Ic is controlled by Ie, the emitter current. Emitter is named such because it emits electrons (npn device). The collector is so named as it collects the electrons. A scope can illustrate this. When Ie changes, Ic follows immediately as does Ib, th...

• #### Lab: Using a Transistor to Control a High Current Load ...

It has three connections, the base, the collector, and the emitter as shown in Figure 14 and Figure 15. Attach high-current load (i.e. the motor or light) to its power source, and then to the collector of the transistor. Then connect the emitter of the transistor to ground. Then to control the motor, you apply voltage to the transistor's base.

• #### Why is saturation collector current not equal to beta*base ...

The relation (collector current equal to beta*base current) is valid for for transistor where collector current is controlled by base current in a situation that base junctionis forward bias and ...

• #### UNIT-2

the maximum collector to emitter breakdown voltage that can be sustained when base current is zero and BV CBO is the collector base breakdown voltage when the emitter is open circuited. The primary breakdown shown takes place because of avalanche breakdown of collector base junction. Large power dissipation normally leads to primary breakdown.

• #### Chapter 8: Transistors [Analog Devices Wiki]

The collector emitter current can be viewed as being controlled by the base-emitter current (current control), or by the base-emitter voltage (voltage control). These views are related by the current-voltage relation of the base-emitter junction, which is just the usual exponential current-voltage curve of a PN junction (diode).

• #### Why does collector current increase with base current in …

Hello, an increase in base current means more bias to the transistor which further means collector current will also increase but till the limiting value of the transistor parameters. However, if ...