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Why is junction capacitance of collector to base junction is lower than base to emitter junction?
Wiki User
∙ 8y ago
The collector base depletion zone is wider than the emitter base depletion zone.
Wiki User
∙ 8y ago
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Can you interchange the collector and emitter terminals in a transistor?
Yes, but the results will be quite unsatisfactory due to differences in the dopant profiles of the collector and emitter.In the normal connection, beta will usually be in the range of 20 to 150 and the transistor will operate at the frequency given in the databook. The same transistor with the collector and emitter interchanged, beta will usually be in the range of 3 to 10 and the transistor will be much slower than the frequency given in the databook. Other parameters will also be degraded below databook values.It should not in general damage the transistor though, but some transistors having very low emitter-base reverse breakdown voltage will have their emitter-base junction burned out when the emitter is used as the collector, in some circuits.
What is frequncy responce of common emitter amplifier?
It is the range of frequencies over which the amplifier works as designed. It is limited at the lower end by coupling capacitors in series with the signal, and at the high end by capacitance in parallel with the signal.
What is Saturation voltage of bjt?
It is the CE (collector - emitter) voltage at a given collector current when the transistor is fully on. Increasing the base current will not lower the CE voltage any more once saturation has been reached.
What pnp friendly means?
Since this is in the electronics section, I'll assume you mean a PNP transistor. PNP refers to the semiconductor layers used to make up the transistor. The P and N letters refer to positive and negative doping in the semiconductors, which changes the way electrons flow through the layers. This is a bipolar junction transistor (BJT), which can be thought of as a current amplifier. One P layer is called the emitter and the other is called the collector. The N layer is called the base. The emitter and collector are not usually interchangeable because they are made differently. When the voltage on the base is below the voltage on the emitter, usually by about 0.7 Volts, current flows from emitter to base. This allows a much larger current to flow from emitter to collector. This assumes the collector is at a lower voltage than the base, and is the usual connection. Similarly, there are NPN transistors.
How do you identify base collector and emitter of transistor?
It is possible with an ohmmeter usually the can has a tab signify emitter. some plastics devices have the emitter on the right lead looking at the flat part. using an ohmmeter you may check for the two diodes inside.
What does it mean when you say a transistors junction is saturated?
It's called saturation because the collector voltage cannot go any lower. You've done all you can do with your base current (in Common Emitter configuration) to lower the collector voltage and support the collector current.
Can you interchange the collector and emitter terminals in a transistor?
Yes, but the results will be quite unsatisfactory due to differences in the dopant profiles of the collector and emitter.In the normal connection, beta will usually be in the range of 20 to 150 and the transistor will operate at the frequency given in the databook. The same transistor with the collector and emitter interchanged, beta will usually be in the range of 3 to 10 and the transistor will be much slower than the frequency given in the databook. Other parameters will also be degraded below databook values.It should not in general damage the transistor though, but some transistors having very low emitter-base reverse breakdown voltage will have their emitter-base junction burned out when the emitter is used as the collector, in some circuits.
Why would there be a gain when you add the emitter capacitor to a circuit board?
A capacitor has lower resistance (impedance) as frequency increases. Adding an emitter capacitor effectively lowers the emitter resistance as frequency increases. Since gain in a typical common emitter amplifier is collector resitance divided by emitter resistance, this decrease in emitter resistance will increase gain as frequency increases.
What is frequncy responce of common emitter amplifier?
It is the range of frequencies over which the amplifier works as designed. It is limited at the lower end by coupling capacitors in series with the signal, and at the high end by capacitance in parallel with the signal.
What is Saturation voltage of bjt?
It is the CE (collector - emitter) voltage at a given collector current when the transistor is fully on. Increasing the base current will not lower the CE voltage any more once saturation has been reached.
What is the voltage required to turn on a silicon transistor?
basically a .6v to .7v is required to saturate the transistor The collector to emitter region will begin to become conductive once the base emitter junction is forward biased enough. Depending on the current through the base-emitter junction, the forward voltage drop could be anywhere from around .55 to .8 volts. .6 to .7 volts minimum is a good approximation not taking into account the device characteristics. Bipolar transistors (npn pnp) are current to current devices not voltage to current. This is for silicon transistors, germanium devices are lower forward voltage devices. Around .3 volts.
What is the function of an emitter?
emitter collects output current produced in resister Wrong. An emitter in a semiconductor emits majority current carriers (electrons or holes) into the junction between it and the base..
What pnp friendly means?
Since this is in the electronics section, I'll assume you mean a PNP transistor. PNP refers to the semiconductor layers used to make up the transistor. The P and N letters refer to positive and negative doping in the semiconductors, which changes the way electrons flow through the layers. This is a bipolar junction transistor (BJT), which can be thought of as a current amplifier. One P layer is called the emitter and the other is called the collector. The N layer is called the base. The emitter and collector are not usually interchangeable because they are made differently. When the voltage on the base is below the voltage on the emitter, usually by about 0.7 Volts, current flows from emitter to base. This allows a much larger current to flow from emitter to collector. This assumes the collector is at a lower voltage than the base, and is the usual connection. Similarly, there are NPN transistors.
Difference between Schottky Barrier Diodes and PN junction diodes?
Difference between Schottky Barrier Diode and P-N Junction Diode is as following...Schottky Diode1) Usually using the aluminum metal which is trivalent element. 2) Depletion layer is thinner than the p-n junction diode.3) Forward threshold voltage is smaller than p-n junction diode(0.1V).4) The junction capacitance is lower than p-n junction diode.P-N Junction Diode1) Trivalent impurity is added to the pure silicon structure. 2) Depletion layer is wider than Schottky diode.3) Forward threshold voltage is higher than Schottky diode(0.6V)4) The junction capacitance is higher than Schottky diode.
How do you identify base collector and emitter of transistor?
It is possible with an ohmmeter usually the can has a tab signify emitter. some plastics devices have the emitter on the right lead looking at the flat part. using an ohmmeter you may check for the two diodes inside.
What is the effect of bypass capacitor on frequency response?
Gain in a CE configuration of a BJT is collector resistance divided by emitter resistance, subject to the limit of hFe. The emitter bypass capacitor will have lower impedance at high frequency, so the gain will be higher at higher frequency, making this a high-pass amplifier.
How do i design logic gates for AND using BJT?
By just connecting two BJT such that both gets inputs at the BASE and emitter of one is connected to the collector of another BJT. Then the upper transistor should provide potential about 15V at the collector and the emitter of of the lower BJT is grounded as well as taken output. This will give you results according to the truth table of AND logic gate but mind it that result will not in 0 and 1 rather in high and low voltages.
