Comparison of cb,ce and cc configuration
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The document compares three common transistor configurations: common base (CB), common emitter (CE), and common collector (CC). It outlines the characteristics of each configuration, including their typical input and output impedances, current and voltage gains, phase inversion, and applications. A table summarizes the main parameters for each configuration, such as their voltage and current gains, power gains, phase inversion, and typical input and output impedances.
Comparison of cb,ce and cc configuration
- 1. By RAVICHANDER B Assistant Professor ,Dept of ECE Comparison of CB,CE and CC configuration
- 2. Transistor CB (Common Base) configuration It is transistor circuit in which base is kept common to the input and output circuits. Characteristics: • It has low input impedance (on the order of 50 to 500 Ohms). • It has high output impedance (on the order of 1 to 10 Mega Ohms).
- 3. Transistor CE (Common Emitter) configuration It is transistor circuit in which emitter is kept common to both input and output circuits. Characteristics (applications): • It has high input impedance (on the order of 500 to 5000 Ohms). • It has low output impedance (on the order of 50 to 500 Kilo Ohms). • Current gain (Beta) is 98. • Power gain is upto 37 dB. • Output is 180 degree out of phase.
- 4. Transistor CC (Common Collector) configuration It is transistor circuit in which collector is kept common to both input and output circuits. It is also called as emitter follower. Characteristics: • It has high input impedance (on the order of about 150 to 600 Kilo Ohms). • It has low output impedance (on the order of about 100 to 1000 Ohms). • Current gain (Beta) is about 99. • Voltage and power gain is equal to or less than one.
- 5. Following table summarizes important points about CB,CE,CC transistor configurations. Parameter Common Base Common Emitter Common Collector Voltage Gain High, Same as CE High Less than Unity Current Gain Less than Unity High High Power Gain Moderate High Moderate Phase inversion No Yes No Input Impedance Low (50 Ohm) Moderate (1 KOhm) High (300 KOhm) Output Impedance High (1 M Ohm) Moderate (50 K) Low (300 Ohm)
- 6. Thank you