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Why input impedance is greater than output impedance in common emitter configuration?
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Is Common emitter configuration has high input impedance or medium input impedance?
Slightly less than cc configuration but greater than cb
Which transistor configuration has the highest input impedance?
Common Emitter Configuration has maximum impedance.
Why is common emitter is greater than common collector?
Common-emitter gives more voltage gain because a common-collector amplifier has a voltage gain of 1. But a common-collector can have a power gain because the input impedance is much more than the output impedance.
Why more current amplification in common emitter?
A bipolar transistor can be used in different configurations in linear electronic design. Most well known is the common emitter CE configuration with a base current as input signal resulting in a collector signal multiplied by the current gain factor. The second configuration is known as the emitter follower or common collector configuration. Here the input signal is in the form of a voltage between the base and the common connection. The output signal is found in the form of a voltage at the emitter with a relative low output impedance. The voltage swing at the input is almost as large at the output where the input impedance equals the product of the current gain factor and the emitter resistance. The third configuration is known as common base CB. Here the input current at the emitter almost equals the output current at the collector. The current gain is nearly equal to 1.
Is the output impedance of common emitter a fixed quantity?
A: NO it is not fixed it depends on the load line
In a common emitter transistor the primary purpose of a resistor connected to the emitter is to?
The emitter resistor in a common emitter configuration provides negative feedback to the transistor, reducing both its voltage gain and distortion.
What are common uses of a common emitter amplifier?
bcause amplification factor beta is usually ranges from 20-500 hence this configuration gives appericiable current gain as well as voltage gain at its output on the other hand in the Common Collector configuration has very high input resistance(~750 kilo ohm) & very low output resistance(~25 ohm) so the voltage gain is always less than one & its most important application is for impedance matching for drivingh from low impedance load to high impedance source
What is the effect in an input impedance of a common emitter amplifier if the bypass capacitor is removed?
The input impedance of a common emitter amplifier is hfe (or beta) times the sum of the emitter resistance, re = kT/qIc, plus the external impedance in series with the emitter. k - Boltzmann's constant, T - degrees Kevin, q - electron charge, Ic - collector current makes the intrinsic emitter resistance about 26 ohms at 1 ma. If the bypass capacitor impedance is much less than 26 ohms at the frequency of interest, then for a beta = 100 transistor operating at 1ma the input impedance is about 2600 ohms at low frequencies ie. 100 * (26 + 0). Say the external emitter resistance is 1K ohm and you remove the bypass cap. The total emitter resistance is now 26+1000 or 1026 ohms and the input impedance is now 100 * (26+1K ohms) or 102.6K ohms.
What do you mean by common emitter configuration and biasing pnp transistors?
A common emitter BJT transistor has the emitter ground. So u measure input voltage at base with respect to the ground, i.e; emitter and also u measure the output voltage at collector with respect to the ground, i.e; emitter. Hence, the emitter is common and thus the name.
What configuration commonly employed in bipolar transistor amplifier?
Common Emitter - Class A Amplifier.
Which transistor configuration is mostly used?
common emitter configuration is use for amplification purpose while common collector is use as buffer as its op is same as ip..
What will happen to voltage divider circuit if emitter resistance is greater than collector resistance?
The gain of a class A, common emitter BJT amplifier, a fairly standard configuration, is defined as collector resistance divided by emitter resistance, or as hFe, whichever is less. Assuming that we are operating in a linear mode, and hFe is not a limiting factor, then the emitter resistance being greater than the collector resistance simply means that the gain is less than one.
