What is common collector circuit?
The Common Collector Amplifier is another type of bipolar junction transistor, (BJT) configuration where the input signal is applied to the base terminal and the output signal taken from the emitter terminal. Thus the collector terminal is common to both the input and output circuits.
What is another name for a common collector circuit?
emitter follower
In electronics, a common collector amplifier (also known as an emitter follower) is one of three basic single-stage bipolar junction transistor (BJT) amplifier topologies, typically used as a voltage buffer.
Why common collector is used?
Common collector configuration, also known as emitter follower provides high input impedance and low output impedance. So they are used for the purpose of impedance matching. In common collector configuration, the collector terminal is common to both input and output terminals.
How is CB and CC current gain related?
The current gain for a CB configuration is called Alpha, ( α ). In a BJT amplifier the emitter current is always greater than the collector current as IE = IB + IC, the current gain (α) of the amplifier must therefore be less than one (unity) as IC is always less than IE by the value of IB.
Why common collector is a amplifier?
This is the unique quality of the common-collector amplifier: an output voltage that is nearly equal to the input voltage. Examined from the perspective of output voltage change for a given amount of input voltage change, this amplifier has a voltage gain of almost unity (1), or 0 dB.
What are the differences between CE CB and CC amplifiers?
If CC configuration is considered for amplification, though CC amplifier has better input impedance and lower output impedance than CE amplifier, the voltage gain of CC is very less which limits its applications to impedance matching only.
What is a common-collector circuit?
The common-collector circuit is a basic transistor amplifier with current gain. It has a high input impedance and a low output impedance. The voltage gain is slightly lower than one.
What is a common collector in a transistor?
Common collector. In this circuit the base terminal of the transistor serves as the input, the emitter is the output, and the collector is common to both (for example, it may be tied to ground reference or a power supply rail ), hence its name. The analogous field-effect transistor circuit is the common drain amplifier and…
How does a common collector work?
Common collector: Input is applied to base and collector. Output is from emitter-collector circuit. It should be apparent that the load resistor in the common-collector amplifier circuit receives both the base and collector currents, being placed in series with the emitter.
What is the output voltage of common collector?
Common collector: Output equals input less a 0.7 V VBE drop. Unlike the common-emitter amplifier from the previous section, the common-collector produces an output voltage in direct rather than inverse proportion to the rising input voltage. See Figure above. As the input voltage increases, so does the output voltage.