What is the value of input and output resistance of CB CE CC amplifier in terms of low and high?
Comparison between CB CE CC Amplifiers
| Characteristic | CE | CC |
|---|---|---|
| Input resistance | Low (1K to 2K) | High (20-500 KΩ) |
| Output resistance | Large (≈ 50 K) | Low (50-1000 KΩ) |
| Current gain | B high | High (1 + β) |
| Voltage gain | High (≈ 1500) | Less than one |
What is the input and output impedance of the CC configuration compared to CE and CB configuration?
Comparison between CB, CE, and CC Configuration
| Characteristics | CB | CE |
|---|---|---|
| Output Impedance | Very High(1 to 10 Mega Ohm) | Medium(50 to 500 kilo ohm) |
| Input Current | Emitter Current or IE | Base Current or IB |
| Output Current | Collector Current or IC | Collector Current or IC |
| Output Signal Phase | Same phase with input | 180 degree out of phase |
Is there any phase shift between input and output in CC configuration?
If it is the normal audio frequency range, there is no phase shift between the input and the output. So, increasing current at the input gives rise to increasing output current . A decreasing input gives a decreasing output current. Hence, phase difference is zero.
How is input resistance related to output resistance?
The closed-loop input resistance is effectively ( Ri ‖ Rf )/ (1 + GH ). The effect of negative feedback on output resistance can be analyzed by representing the output as a Thévenin equivalent voltage source with internal voltage of v and open-loop output resistance of Ro. An output voltage of vo is produced by a current io applied to the output.
What’s the difference between a CB and CE transistor circuit?
It is transistor circuit in which base is kept common to the input and output circuits. • 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). • Current gain (alpha) is less than unity.
How does a CC configuration work in a transistor?
In CC configuration, the input resistance is high and the output resistance is low. The voltage gain provided by this circuit is less than 1. The sum of collector current and base current equals emitter current. The input and output signals are in phase. This configuration works as non-inverting amplifier output.
Which is the ideal input resistance for an amplifier?
If the voltage source resistance rs is variable or unknown, the attenuation of the divider and the overall voltage gain will be too. To avoid this, the ideal amplifier input resistance is infinite, so vin = vi independent of rs. FIG. 2.4. Amplifier input and output loading for (a) voltage and (b) current amplifiers.